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Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
Document and Entity Information - USD ($) $ in Thousands	Dec. 31, 2015	Feb. 24, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	THRM
Entity Registrant Name	GENTHERM INC
Entity Central Index Key	0000903129
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		36,325,775
Entity Public Float			$ 1,951,276

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 144,479	$ 85,700
Accounts receivable, less allowance of $2,839 and $2,847, respectively	142,610	136,183
Inventory	84,183	77,643
Derivative financial instruments		145
Deferred income tax assets	6,716	6,247
Prepaid expenses and other assets	42,620	29,107
Total current assets	420,608	335,025
Property and equipment, net of accumulated depreciation of $34,107 and $27,221, respectively	119,157	91,727
Goodwill	27,765	30,398
Other intangible assets, net of accumulated amortization of $59,594 and $53,756, respectively	48,461	68,129
Deferred financing costs	310	406
Deferred income tax assets	22,094	18,843
Derivative financial instruments		1,345
Other non-current assets	8,403	8,404
Total assets	646,798	554,277
Current Liabilities:
Accounts payable	77,115	71,434
Accrued liabilities	60,823	68,387
Current maturities of long-term debt	4,909	5,306
Derivative financial instruments	725	2,466
Deferred income tax liabilities	211
Total current liabilities	143,783	147,593
Pension benefit obligations	6,545	6,706
Other Liabilities	5,026	2,788
Long-term debt, less current maturities	92,832	85,469
Derivative financial instruments		6,698
Deferred tax liabilities	14,321	10,804
Total liabilities	262,507	260,058
Common Stock:
No par value; 55,000,000 shares authorized, 36,321,775 and 35,696,742 issued and outstanding at December 31, 2015 and 2014, respectively	256,919	243,255
Paid-in capital	(1,282)	(8,224)
Accumulated other comprehensive income	(51,670)	(25,743)
Accumulated earnings	180,324	84,931
Total shareholders’ equity	384,291	294,219
Total liabilities and shareholders’ equity	$ 646,798	$ 554,277

Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands

Dec. 31, 2015

Dec. 31, 2014

Statement Of Financial Position [Abstract]

Accounts receivable, allowance

$ 2,839

$ 2,847

Accumulated depreciation

^[1]

34,107

27,221

Accumulated amortization

$ 59,594

$ 53,756

Common Stock, par value

Common Stock, shares authorized

55,000,000

Common Stock, shares issued

36,321,775

35,696,742

Common Stock, shares outstanding

36,321,775

35,696,742

[1]	Includes accumulated amortization of capital lease obligations.

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Product revenues	$ 856,445	$ 811,300	$ 662,082
Cost of sales	580,066	569,618	487,320
Gross margin	276,379	241,682	174,762
Operating costs and expenses:
Research and development expenses	69,211	66,411	52,197
Reimbursed research and development expenses	(9,607)	(8,885)	(2,324)
Net research and development expenses	59,604	57,526	49,873
Acquisition transaction expenses		1,075	2,414
Selling, general and administrative expenses	95,456	84,647	72,091
Total operating costs and expenses	155,060	143,248	124,378
Operating income	121,319	98,434	50,384
Interest expense	(2,610)	(3,262)	(3,543)
Debt retirement expense		(1,370)
Revaluation of derivatives (loss) gain	(1,102)	(518)	1,006
Gain on settlement of lawsuit	9,949
Foreign currency gain (loss)	1,121	(218)	(2,228)
Gain from equity investment		785	436
Other income	261	370	175
Earnings before income tax	128,938	94,221	46,230
Income tax expense	33,545	24,102	11,097
Net income	95,393	70,119	35,133
Income attributable to non-controlling interest			(1,313)
Net income attributable to Gentherm Incorporated	95,393	70,119	33,820
Convertible preferred stock dividends			(1,622)
Net income attributable to common shareholders	$ 95,393	$ 70,119	$ 32,198
Basic earnings per share	$ 2.65	$ 1.98	$ 0.96
Diluted earnings per share	$ 2.62	$ 1.95	$ 0.94
Weighted average number of shares—basic	36,031,792	35,411,608	33,652,646
Weighted average number of shares—diluted	36,475,102	36,049,331	34,123,641

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 95,393	$ 70,119	$ 35,133
Other comprehensive income (loss), gross of tax:
Net gain (loss) on pension benefit obligations	847	(2,295)	126
Foreign currency translation adjustments	(25,904)	(25,044)	5,315
Unrealized gain (loss) on foreign currency derivative securities	10	(10)
Unrealized gain on interest rate derivative securities		81	143
Unrealized loss on commodity derivative securities	(725)
Other comprehensive (loss) income, gross of tax	(25,772)	(27,268)	5,584
Other comprehensive income, related tax effects:
Net gain (loss) on pension benefit obligations	(234)	680	18
Foreign currency translation adjustments	(417)	6,048	426
Unrealized loss on commodity derivative securities	496
Other comprehensive (loss) income, related tax effect	(155)	6,728	444
Other comprehensive (loss) income, net of tax:	(25,927)	(20,540)	6,028
Comprehensive income:	69,466	49,579	41,161
Less: comprehensive loss attributable to the non-controlling interest			(271)
Comprehensive income attributable to Gentherm Incorporated:	$ 69,466	$ 49,579	$ 41,432

Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Accumulated Earnings	Loss on Pension Benefit Obligation	Currency Translation Adjustments	Foreign Currency Hedge Adjustment	Commodity Hedge Adjustment	Interest Rate Hedge Adjustment	Total Gentherm Equity	Noncontrolling Interest
Beginning Balance at Dec. 31, 2012	$ 215,163	$ 166,309	$ 24,120	$ (17,383)	$ (1,202)	$ (9,805)			$ (224)	$ 161,815	$ 53,348
Beginning Balance (in shares) at Dec. 31, 2012		29,818,000
Acquisition of non-controlling interest	(45,637)	$ 42,517	(35,080)							7,437	(53,074)
Acquisition of non-controlling interest (in shares)		3,300,000
Exercise of Common Stock options for cash	$ 4,801	$ 6,624	(1,823)							4,801
Exercise of Common Stock options for cash (in shares)	672,753	673,000
Tax benefit from Exercises of Common Stock options	$ 2,074		2,074							2,074
Common Stock issued to Board of Directors and employees	1,509	$ 1,509								1,509
Common Stock issued to Board of Directors and employees (in shares)		184,000
Stock option compensation	1,127		1,127							1,127
Convertible preferred stock dividends	(1,622)			(1,622)						(1,622)
Stock issued upon conversion of preferred stock	15,108	$ 15,108								15,108
Stock issued upon conversion of preferred stock (in shares)		954,000
Distribution paid to non-controlling interest	(6)			(3)						(3)	(3)
Net gain (loss) on pension benefit obligation	144				144					144
Currency translation, net	4,157					5,741				5,741	(1,584)
Interest rate hedge, net	143								143	143
Net Income	35,133			33,820						33,820	$ 1,313
Ending Balance at Dec. 31, 2013	232,094	$ 232,067	(9,582)	14,812	(1,058)	(4,064)			(81)	232,094
Ending Balance (in shares) at Dec. 31, 2013		34,929,000
Exercise of Common Stock options for cash	$ 7,176	$ 9,595	(2,419)							7,176
Exercise of Common Stock options for cash (in shares)	731,142	731,000
Tax benefit from Exercises of Common Stock options	$ 1,831		1,831							1,831
Common Stock issued to Board of Directors and employees	2,706	$ 2,706								2,706
Common Stock issued to Board of Directors and employees (in shares)		105,000
Stock option compensation	1,946		1,946							1,946
Cancelation of restricted stock	(1,113)	$ (1,113)								(1,113)
Cancelation of restricted stock (in shares)		(68,000)
Net gain (loss) on pension benefit obligation	(1,615)				(1,615)					(1,615)
Currency translation, net	(18,996)					(18,996)				(18,996)
Foreign currency hedge, net	(10)						$ (10)			(10)
Interest rate hedge, net	81								$ 81	81
Net Income	70,119			70,119						70,119
Ending Balance at Dec. 31, 2014	$ 294,219	$ 243,255	(8,224)	84,931	(2,673)	(23,060)	(10)			294,219
Ending Balance (in shares) at Dec. 31, 2014	35,696,742	35,697,000
Exercise of Common Stock options for cash	$ 9,273	$ 12,146	(2,873)							9,273
Exercise of Common Stock options for cash (in shares)	571,723	571,000
Tax benefit from Exercises of Common Stock options	$ 6,681		6,681							6,681
Common Stock issued to Board of Directors and employees	3,734	$ 3,734								3,734
Common Stock issued to Board of Directors and employees (in shares)		108,000
Stock option compensation	3,025		3,025							3,025
Cancelation of restricted stock	(2,216)	$ (2,216)								(2,216)
Cancelation of restricted stock (in shares)		(54,000)
Net gain (loss) on pension benefit obligation	613				613					613
Currency translation, net	(26,212)		109			(26,321)				(26,212)
Foreign currency hedge, net	10						$ 10			10
Commodity hedge, net	(229)							$ (229)		(229)
Net Income	95,393			95,393						95,393
Ending Balance at Dec. 31, 2015	$ 384,291	$ 256,919	$ (1,282)	$ 180,324	$ (2,060)	$ (49,381)		$ (229)		$ 384,291
Ending Balance (in shares) at Dec. 31, 2015	36,321,775	36,322,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities:
Net income	$ 95,393	$ 70,119	$ 35,133
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	31,029	35,029	31,249
Deferred income taxes	(711)	(11,103)	(2,121)
Gain on CRS settlement	(9,949)
Revaluation of derivatives	(490)	(1,039)	(2,678)
Debt extinguishment expenses		1,370
Stock compensation	6,018	4,652	2,636
Loss on sale of property and equipment	20	131	106
Loss from write-off of intangible assets	358
Provision for doubtful accounts	115	1,017	(705)
Defined benefit pension plan expense	668	820	(659)
Gain from equity investment		(785)	(436)
Changes in operating assets and liabilities:
Accounts receivable	(12,399)	(16,902)	(13,828)
Inventory	(10,954)	(8,367)	(9,600)
Prepaid expenses and other assets	(11,122)	(5,871)	(9,446)
Accounts payable	8,049	6,956	18,255
Accrued liabilities	8,687	4,308	11,888
Net cash provided by operating activities	104,712	80,335	59,794
Investing Activities:
Settlement of derivative financial instruments	(7,593)
Purchase of non-controlling interest			(48,567)
Investment in subsidiary, net of cash acquired	107	(31,474)
Cash invested in corporate owned life insurance			(266)
Purchases of property and equipment	(55,490)	(38,887)	(35,861)
Proceeds from the sale of property and equipment	248	487	11
Net cash used in investing activities	(62,728)	(69,874)	(84,683)
Financing Activities:
Distribution paid to non-controlling interest			(3)
Cash paid for financing costs		(1,139)
Borrowing of Debt	15,000	91,592	45,669
Repayments of Debt	(5,053)	(79,692)	(24,496)
Cash paid for the cancellation of restricted stock	(1,475)	(1,113)
Excess tax benefit from equity awards	6,681	1,831	2,074
Redemption of Series C Preferred Stock			(8,446)
Series C Preferred Stock Holders dividend			(696)
Proceeds from the exercise of Common Stock options	9,273	7,176	4,801
Net cash provided by financing activities	24,426	18,655	18,903
Foreign currency effect on cash and cash equivalents	(7,631)	1,699	2,719
Net increase (decrease) in cash and cash equivalents	58,779	30,815	(3,267)
Cash and cash equivalents at beginning of period	85,700	54,885	58,152
Cash and cash equivalents at end of period	144,479	85,700	54,885
Supplemental disclosure of cash flow information:
Cash paid for interest	2,826	2,558	2,653
Cash paid for taxes	32,376	21,756	11,326
Supplemental disclosure of non-cash transactions:
Issuance of Common Stock to non-controlling interest			42,517
Issuance of Common Stock for Series C Preferred Stock conversion			15,108
Capital Lease			3,254
Common Stock issued to directors and employees	$ 3,734	$ 2,706	$ 1,509

The Company	12 Months Ended
The Company	Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company	Note 1 — The Company Gentherm Incorporated is a global technology and industry leader in the design, development, and manufacturing of innovative thermal management technologies and automotive cable systems. Unless the context otherwise requires, the terms “Company”, “we”, “us” and “our” used herein refer to Gentherm Incorporated and its consolidated subsidiaries. Our automotive products provide solutions for automotive passenger comfort and convenience, battery thermal management, remote power generation and other consumer and industrial temperature control needs. Our products can be found on the vehicles of nearly all major automotive manufacturers operating in North America, Europe and Asia. We operate in locations aligned with our major customers’ product strategies in order to provide locally enhanced design, integration and production capabilities and to identify future thermal technology product opportunities in both automotive and other markets. We concentrate our research on the development of new technologies that will enable new products, improve overall effectiveness of existing products and maximize customer satisfaction. We also focus on developing new design applications from our existing technologies to create new products and market opportunities for thermal comfort solutions. The Company has two reportable segments for financial reporting purposes: Automotive and Industrial. Automotive The Automotive reporting segment is comprised of the aggregated results from Gentherm’s three geographic operating segments: North America, Europe and Asia. Results from our automotive seat comfort systems, specialized automotive cable systems and other automotive and non-automotive thermal convenience products are reported in the automotive segment because of their complementary focus on automotive content and/or individual comfort and convenience. Automotive seat comfort systems include seat heaters, variable temperature Climate Control Seats^TM (“CCS”) designed to provide individualized thermal comfort to automobile passengers, and integrated electronic components, such as blowers and electronic control units. Specialized automotive cable system products include ready-made wire harnesses and related wiring products. Automotive products include the automotive steering wheel heater, heated and cooled cup holder and thermal storage bin. Revenues from our non-automotive products include the heated and cooled mattress and furniture. Our customers include light vehicle original equipment manufacturers (“OEMs”), commercial vehicle OEMs, and Tier 1 suppliers to the automotive OEMs, including automotive seat manufacturers. Customers of our non-automotive products include companies in the telecommunications, information technology, furniture and medical equipment industries. Industrial The Industrial reporting segment represents the combined results from our remote power generation systems business for industrial applications and our advanced research and product development division, which is currently researching and developing new products for a variety of different markets. The advanced research and product development division is engaged in projects to improve the efficiency of thermal management technologies and to develop, market, and distribute products based on these new technologies. The operating results from our remote power generation systems business and the advanced research and product development division are presented together as one reporting segment because of their complementary focus on thermoelectric technologies and related products. See “Research and Development” below for a description of our internal and external research and development initiatives See Note 10 of the consolidated financial statements for information regarding the Company’s segment revenues from external customers, including geographic composition, operating income and changes to the presentation of prior year information.

Summary of Significant Accounting Policies and Basis of Presentation

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies and Basis of Presentation

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation

Consolidation

The consolidated financial statements at and for the years ended December 31, 2015, 2014 and 2013, reflect the consolidated financial position and consolidated operating results of the Company. Investments in affiliates in which Gentherm does not have control, but does have the ability to exercise significant influence over operating and financial policies, are accounted for under the equity method. Intercompany accounts have been eliminated in consolidation. Certain reclassifications of prior years’ amounts have been made to conform with the current year’s presentation.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with original maturities of less than 90 days to be cash equivalents. Cash balances in individual banks may exceed the federally insured limit by the Federal Deposit Insurance Corporation. The Company had cash and cash equivalents of $140,088 and $81,488 held in foreign jurisdictions as of December 31, 2015 and 2014, respectively.

Disclosures About Fair Value of Financial Instruments

The carrying amounts of financial instruments comprising cash and cash equivalents, short-term investments and accounts receivable approximate fair value because of the short maturities of these instruments. The carrying amount of the Company’s long-term debt approximates its fair value because interest charged on the loan balance is variable. See Note 12 for information about the techniques used to assess the fair value of financial assets and liabilities, including our fixed rate debt instruments.

Use of Estimates

The presentation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Accrued Warranty Costs

The Company recognizes an estimated cost associated with warranty claims on its products at the time of sale. The amount recognized is based on estimates of future failure rates and current claim cost experience. The following is a reconciliation of the changes in accrued warranty costs for the reporting period:


	December 31,
	2015			2014
Balance at beginning of year	$	5,221		$	10,308
Warranty claims paid or retired		(1,654	)		(1,102	)
Reversal of previously recorded liability		—			(3,744	)⁽¹⁾
Expense		1,339			555
Adjustment due to currency translation		(348	)		(796	)
Balance at end of year	$	4,558		$	5,221

(1)

During 2014, we reversed accruals for warranty liabilities. The reversal was due to management’s review of the facts and circumstances of the liability and the conclusion that the likelihood of settlement would be remote. The reversal is included as a reduction to the reported cost of sales during the year ended December 31, 2014.

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

Concentration of Credit Risk

Financial assets, which subject the Company to concentration of credit risk, consist primarily of cash equivalents, short-term investments and accounts receivable. Cash equivalents consist primarily of money market funds managed by major financial services companies. The credit risk for these cash equivalents is considered low. The Company does not require collateral from its customers. As of December 31, 2015, Lear Corporation, Johnson Controls Inc. and Faurecia comprised 28%, 27% and 5% respectively, of the Company’s accounts receivable balance. As of December 31, 2014, Johnson Controls Inc., Lear Corporation and Magna International Inc. comprised 27%, 27% and 5% respectively, of the Company’s accounts receivable balance. These accounts are currently in good standing.

Allowance for Doubtful Accounts

We record an allowance for doubtful accounts once exposure to collection risk of an accounts receivable is specifically identified. We analyze the length of time an account receivable is outstanding, as well as a customer’s payment history and ability to pay to determine the need to record an allowance for doubtful accounts.

Inventory

The Company’s inventory is measured at the lower of cost or market, with cost being determined using the first-in first-out basis. Raw materials, consumables and commodities are measured at cost of purchase and unfinished and finished goods are measured at cost of production, using the weighted average method. If the net realizable value expected on the reporting date is below cost, a write-down is recorded to adjust inventory to its net realizable value. The Company provides a reserve for obsolete and slow moving inventories based upon estimates of future utilization. The following is a reconciliation of the changes in the inventory reserve:

	December 31,
	2015			2014
Balance at beginning of year	$	4,802		$	2,933
Expense		815			2,204
Inventory write off		(1,060	)		(154	)
Adjustment due to currency translation		(249	)		(181	)
Balance at end of year	$	4,308		$	4,802

Property and Equipment

Property and equipment, including additions and improvements, are recorded at cost less accumulated depreciation. Expenditures for repairs and maintenance are charged to expense as incurred. When property or equipment is retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts. Gains or losses from retirements and disposals are recorded as operating income or expense.

Depreciation and amortization are computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:

Asset Category		Useful Life
Buildings and building improvements		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		2 to 5 years
Leasehold improvements		Term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Term of lease

The Company recognized depreciation expense of $16,360, $14,930 and $14,810 for the years ended December 31, 2015, 2014 and 2013, respectively.

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

Goodwill and Other Intangible Assets

Goodwill and other intangible assets recorded in conjunction with business combinations are based on the Company’s estimate of fair value, as of the date of acquisition. A roll forward of goodwill from December 31, 2013 to December 31, 2015 is as follows:

December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398
Goodwill adjustment arising from the acquisition of GPT		107
Exchange rate impact		(2,740	)
December 31, 2015	$	27,765

The fair value and corresponding useful lives for acquired intangible assets are listed below as follows:

Asset Category		Useful Life
Customer relationships		10-15 years
Order Backlog		0.5 years
Technology		8-10 years
Production Development Costs		4 years

Our business strategy largely centers on designing products based upon internally developed and purchased technology. When possible, we protect these technologies with patents. Our policy is to expense all costs associated with the development and issuance of new patents as incurred. Such costs are classified as research and development expenses in our consolidation statements of income.

Patents purchased as part of a business combination are capitalized based on their fair values. Periodically, we review the recoverability and remaining lives of our capitalized patents, and if necessary, make adjustments to reported amounts, based upon unfavorable impacts from market conditions, the emergence of competitive technologies and changes in our projected business plans.

A total of $12,751, $16,941 and $17,570 in other intangible assets, including capitalized patent costs, were amortized in 2015, 2014 and 2013, respectively.

An estimate of intangible asset amortization by year, is as follows:

2016	$	11,569
2017		10,893
2018		8,356
2019		8,336
2020		8,336
Thereafter		971

Impairments of Long-Lived Assets, Other Intangible Assets and Goodwill

Whenever events or changes in circumstances indicate that an asset’s carrying amount may not be recoverable, the Company will compare the carrying amount of the asset to the recoverable amount of the asset. The recoverable amount is defined as the greater of the asset’s fair value less costs to sell or its value in use. An impairment loss is recognized if the carrying amount of an asset exceeds the recoverable or fair value amount. An assessment of fair value could utilize quoted market prices, fair value appraisals, management forecasts or discounted cash flow analyses.

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

In 2015, we wrote off $317 related to patents because certain claims made under specific patents we own were determined to be unpatentable by the United States Patent and Trademark Office. The impaired patents were valued using an income approach. Based on information provided in the ruling, the entire value of each component determined to be unpatentable was written off (Level 3 input). We determined that the loss of this patent protection did not cause a significant change in our projected future cash flows and therefore no other assets were impaired due to the ruling. The write-off was recorded to other intangible assets and cost of sales on the Company’s consolidated balance sheet and consolidated statements of income, respectively. No such triggering events occurred during the period ended December 31, 2014.

Annually on December 31^st, and at interim periods when circumstances require, the Company tests the recoverability of its goodwill. The goodwill test utilizes a two-step analysis, whereby the Company compares the carrying value of each identified reporting unit to its fair value. If the carrying value of the reporting unit is greater than its fair value, the second step is performed, where the implied fair value of goodwill is compared to its carrying value. The Company recognizes an impairment charge for the amount by which the carrying amount of goodwill exceeds its fair value. The fair values of the reporting units are estimated using the net present value of discounted cash flows, excluding any financing costs or dividends, generated by each reporting unit and a comparison of market values of a group of comparable companies. The Company’s discounted cash flows are based upon reasonable and appropriate assumptions, which are weighted for their likely probability of occurrence, about the underlying business activities of the Company’s reporting units. An impairment of goodwill did not occur during the periods ending December 31, 2015 and 2014, respectively.

Product Revenues

The Company sells its products under purchase order contracts issued by its customers. These contracts involve the sale of goods at fixed prices and provide for related transfer of ownership risk to the customer upon shipment from the Company’s warehouse location or in some cases upon receipt of the goods at the customer’s facility. Shipping and handling costs are recognized in cost of sales. With only a few minor exceptions, payment terms for these contracts range from 30 to 120 days from the date of shipment. The Company does not extend cash discounts for early payment.

For construction-type contract revenues recognized in our industrial segment, the completed-contract method is used to determine revenue and the cost of earned revenue. The transfer of ownership upon shipment is used to determine substantial completion and the recognition of revenue for these construction-type contracts.

Tooling

The Company incurs costs related to tooling used in the manufacture of products sold to its customers. In some cases, the Company enters into contracts with its customers whereby the Company incurs the costs to design, develop and purchase tooling and is then reimbursed by the customer under a reimbursement contract. Tooling costs that will be reimbursed by customers are included in prepaid expenses and other current assets at the lower of accumulated cost or the customer reimbursable amount. Approximately $5,174 and $3,990 of reimbursable tooling was capitalized within prepaid expenses and other current assets as of December 31, 2015 and 2014, respectively. Company-owned tooling is included in property and equipment and depreciated over its expected useful life, generally two to five years. Management periodically evaluates the recoverability of tooling costs, based on estimated future cash flows, and makes provisions, where appropriate, for tooling costs that will not be recovered.

Research and Development Expenses

Research and development activities are expensed as incurred. The Company groups development and prototype costs and related reimbursements in research and development. The Company recognizes amounts due as reimbursements for expenses as these expenses are incurred.

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

Income Taxes

We record income tax expense using the liability method which specifies that deferred tax assets and liabilities be measured each year based on the difference between the financial statement and tax bases of assets and liabilities at the applicable enacted tax rates. A valuation allowance is provided for deferred tax assets when management considers it more likely than not that the asset will not be realized. The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority. We recognize interest and penalties related to income tax matters in income tax expense.

Derivative Financial Instruments – Hedge Accounting

The Company accounts for some of its derivative financial instruments as cash flow hedges as defined in Financial Accounting Standards Board Accounting Standards Codification (“ASC”) Topic 815. For derivative contracts which can be classified as a cash flow hedge, the effective potion of the change in the fair value of the derivative is recorded to accumulated other comprehensive income in the consolidated balance sheet. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive income is recorded in earnings in the consolidated statement of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. Any ineffective portion of the gain or loss is recognized in the income statement under foreign currency (loss) gain or revaluation of derivatives gain (loss). These hedging transactions and the respective correlations meet the requirements for hedge accounting.

Earnings per Share

Basic earnings per share is computed by dividing net income by the weighted average number of shares of Common Stock outstanding during the respective period. The Company’s diluted earnings per common share give effect to all potential shares of Common Stock outstanding during a period that are not anti-dilutive. In computing the number of diluted shares outstanding, the treasury stock method is used in order to arrive at a net number of shares created upon the conversion of Common Stock equivalents.

Stock Based Compensation

Share based payments that involve the issuance of Common Stock to employees, including grants of employee stock options and restricted stock, are recognized in the financial statements as compensation expense based upon the fair value on the date of grant.

Share based payments that are satisfied only by the payment of cash, such as stock appreciation rights, are accounted for as liabilities. The liability is reported at market value of the vested portion of the underlying units. During each period, the change in the liability is recorded as compensation expense during periods when the liability increases or income during periods in which the liability decreases.

The Company’s stock based compensation expense and related deferred tax benefit were $12,316 and $3,787, respectively, for the year ended December 31, 2015, $8,601 and $2,949, respectively, for the year ended December 31, 2014, and $3,103 and $419, respectively, for the year ended December 31, 2013.

Pension Plans

The Company’s obligations and expenses for its pension plans are dependent on the Company’s selection of discount rate, expected long-term rate of return on plan assets and other assumptions used by actuaries to calculate these amounts.

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

Subsequent Events

On January 4, 2016 and January 5, 2016, the Company completed reorganization transactions (the “Reorganization”) related to the eventual closure of the Company’s Windsor, Ontario, Canada facility (the “Windsor Operations”). As part of our original integration plan to eliminate redundancies associated with the 2011 acquisition of Gentherm GmbH (formally named W.E.T. Automotive Systems AG), the Windsor Operations will be consolidated into our existing European and North American facilities. As a result of the Reorganization, the business activities previously performed by the Windsor Operations will now be performed by other subsidiaries and the Company’s Windsor office is expected to close permanently in June 2016.

Related to the Reorganization, the Company expects to pay a withholding tax in Canada and record a one-time tax expense of approximately $6,000 in the first quarter of 2016. Additionally, the Reorganization will require the Company to make a one-time income tax payment of approximately $30,000 . However, the Company will record an offsetting deferred charge for approximately the same amount because the one-time income tax payment will result in tax deductions in future periods. Therefore, the income tax payment is not expected to have a material impact on the Company’s earnings in any fiscal quarter. The income tax payment will not become due and payable until the first quarter of 2017.

Details of Certain Financial Statement Components

12 Months Ended

Dec. 31, 2015

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components

Note 3 — Details of Certain Financial Statement Components

	December 31,
	2015			2014
Inventory:
Raw materials, net of reserve	$	50,371		$	48,678
Work in process, net of reserve		4,150			4,009
Finished goods, net of reserve		29,662			24,956
	$	84,183		$	77,643
Property and equipment:
Buildings, plant and equipment	$	103,841		$	76,239
Automobiles		502			499
Production tooling		11,702			11,256
Leasehold improvements		7,546			7,331
Computer equipment and software		17,371			15,560
Construction in progress		12,302			8,063
		153,264			118,948
Less: Accumulated depreciation *		(34,107	)		(27,221	)
	$	119,157		$	91,727
Other intangible assets:
Customer relationships	$	68,296		$	77,026
Technology		29,473			32,467
Product development costs		10,286			12,392
	$	108,055		$	121,885
Less: Accumulated amortization		(59,594	)		(53,756	)
	$	48,461		$	68,129
Accrued liabilities:
Tax accruals	$	18,205		$	15,696
Accrued warranty		4,558			5,221
Accrued employee liabilities		19,481			19,783
Liabilities from discounts and rebates		8,348			8,429
Other accrued liabilities		10,231			19,258
	$	60,823		$	68,387

*	Includes accumulated amortization of capital lease obligations.

Income Taxes

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Note 4 — Income Taxes

The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following:

	December 31,
	2015			2014
Deferred tax assets:
Derivative financial instruments	$	267		$	2,461
Net operating losses		5,525			7,075
Research and development credits		21,494			26,204
Depreciation		3,886			3,456
Valuation reserves and accrued liabilities		5,553			4,788
Foreign tax credit		1,654			823
Stock compensation		3,129			2,006
Inventory		1,622			1,443
Patents		156			138
Defined benefit obligation		2,011			1,479
Other credits		639			593
Other		10			144
		45,946			50,610
Valuation allowance		(13,418	)		(18,037	)
Deferred tax liabilities:
Intangible assets		(10,161	)		(14,593	)
Unrealized foreign currency exchange gains		(3,797	)		(2,855	)
Undistributed profits of subsidiary		(3,254	)		(293	)
Property and equipment		(696	)		(162	)
Other		(342	)		(384	)
		(18,250	)		(18,287	)
Net deferred tax asset (liability)	$	14,278		$	14,286

Reconciliations between the statutory Federal income tax rate of 34% and the effective rate of income tax expense for each of the three years in the period ended December 31, 2015 are as follows:

	Year Ended December 31,
	2015			2014			2013
Statutory Federal income tax rate		34.0	%		34.0	%		34.0	%
Increase (Decrease) resulting from:
U.S. Taxes on foreign income, net of taxes paid credit		1.0	%		0.3	%		(1.7	%)
Change in valuation allowance		(1.9	%)		(0.8	%)		—
Foreign, state and local tax, net of Federal benefit		1.6	%		1.9	%		3.6	%
Nondeductible expenses		1.8	%		1.8	%		1.4	%
Stock option compensation		(0.1	%)		(0.1	%)		(0.5	%)
Research and development credits		(0.9	%)		(0.5	%)		(2.3	%)
Effect of different tax rates of foreign jurisdictions		(12.1	%)		(10.0	%)		(10.8	%)
Undistributed profits of subsidiaries		2.4	%		—			—
Other tax exempt income		(0.1	%)		(0.9	%)		—
Other		0.3	%		(0.1	%)		0.3	%
Effective rate		26.0	%		25.6	%		24.0	%

Note 4 — Income Taxes (Continued)

The Company has Net Operating Loss (“NOL”) carryforwards as follows:

Jurisdiction	Amount as of December 31, 2015		Years of Expiration
U.S. Federal and state income tax	$	47,869		2018- 2034
Foreign	$	5,719		2018-2020
Foreign	$	5,000		Indefinite

On April 1, 2014, we acquired all of the stock of GPT in an all cash transaction. The deferred tax assets in 2015 and 2014 related to research and development credits and the offsetting valuation allowance is primarily a result of the GPT acquisition.

A portion of the U.S. Federal NOLs were incurred prior to the June 8, 1999 Preferred Financing, which qualified as a change in ownership under Section 382 of the Internal Revenue Code (“IRC”). Due to this change in ownership, the NOL accumulated prior to the change in control can only be utilized against current earnings up to a maximum annual limitation of approximately $591. As a result of the annual limitation, approximately $6,025 remaining of these carryforwards are expected to expire before ultimately becoming available to reduce future tax liabilities in addition to $13,324 in NOLs generated prior to the change in control which have already expired without being utilized.

In 2013 through 2015, we incurred NOLs in China and Vietnam associated with the startup activities of new production facilities. In 2015, we incurred a loss in Ukraine associated with foreign currency losses. These NOLs are expected to be utilized in 2016 through 2018 as the locations become profitable. We also incur NOLs in Luxembourg associated with our global holding company structure. Management has concluded that it is more likely than not these NOLs will not be utilized, and thus has not recognized the benefit of these NOLs.

We recognize the tax benefit of stock option exercises in excess of compensation expense recorded for financial reporting purposes directly to paid-in capital only when this excess tax benefit provides a reduction to current taxes payable. In certain tax years, our U.S. Federal NOLs completely offset our current Federal tax liability and, therefore, we did not recognize the benefit of tax deductions allowed for stock option exercises in excess of compensation expense recognized for financial reporting purposes. As such, our deferred tax asset related to NOLs is less than the actual NOL available. We recorded this benefit, which totaled $6,681 and $1,831 for 2015 and 2014, respectively, directly to paid-in capital related to stock compensation tax deductions. The U.S. Federal NOL carryforwards include $22,343 relating to deductions taken with respect to stock option exercises in excess of amounts recognized for financial reporting purposes. This portion of the NOL carryforwards is not included as a component of the Company’s deferred tax asset.

The earnings before for income taxes and our tax provision are comprised of the following:

	Year Ended December 31,
	2015		2014		2013
Income before income taxes:
Domestic	$	25,508	$	11,170	$	6,891
Foreign		103,430		83,051		39,339
Total income before income taxes	$	128,938	$	94,221	$	46,230

Note 4 — Income Taxes (Continued)

	Year Ended December 31,
	2015			2014			2013
Current income tax expense:
Federal	$	8,428		$	4,005		$	690
State and local		606			(15	)		495
Foreign		24,622			24,737			9,959
Total current income tax expense	$	33,656		$	28,727		$	11,144
Deferred income tax expense (benefit):
Federal	$	(3,051	)	$	(576	)	$	12
State and local		(183	)		9			(95	)
Foreign		3,123			(4,058	)		36
Total deferred income tax expense	$	(111	)	$	(4,625	)	$	(47	)
Total tax expense	$	33,545		$	24,102		$	11,097

The Company has recognized deferred taxes related to earnings from foreign subsidiaries, except for certain foreign subsidiaries for which the earnings are permanently reinvested. Quantification of the deferred tax liability, if any, associated with permanently reinvested basis differences is not practicable.

The Company is subject to taxation in the United States and various state and foreign jurisdictions. As of December 31, 2015, the Company’s tax years from 2008 through 2015 are subject to examination by the various tax authorities. With limited exceptions, as of December 31, 2015, the Company is no longer subject to U.S. Federal, state, local, or foreign examinations by tax authorities for years before 2008. A U.S. Federal tax audit is currently ongoing for the 2013 tax year, as well as a Michigan state tax audit for the 2011 tax year. Tax audits are currently ongoing in Germany for tax years 2008 through 2011, and Hungary for tax years 2013 and 2014.

In 2015, the Company received a tax holiday related to its new operating facility in Macedonia. The benefits under this holiday will expire no later than 2025.

At December 31, 2015, 2014 and 2013, the Company had total unrecognized tax benefits of $4,443, $4,651 and $2,241, respectively, all of which, if recognized, would affect the effective income tax rates. The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	Year Ended December 31,
	2015			2014			2013
Balance at beginning of year	$	4,651		$	2,241		$	2,191
Additions based on tax position related to current year		—			43			2
Additions based on tax positions related to prior year		262			2,991			580
Reductions from settlements and statute of limitation expiration		(19	)		(432	)		(599	)
Effect of foreign currency translation		(451	)		(192	)		67
Balance at end of year	$	4,443		$	4,651		$	2,241

The Company classifies income tax-related penalties and net interest as income tax expense. In the years ended December 31, 2015, 2014 and 2013 income tax related interest and penalties were insignificant. The Company believes that it is reasonably possible that there may be a decrease to its unrecognized tax benefits in the next 12 months due to audit settlements and statute expirations, but the amount expected to reverse is insignificant.

Debt

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Debt

Note 5 — Debt

Credit Agreement

The Company, together with certain direct and indirect subsidiaries, have an outstanding Credit Agreement (the “Credit Agreement”) with a syndicate of banks led by Bank of America, N.A.

The Credit Agreement provides for a $50,000 secured term loan facility for Gentherm (the “U.S. Term Loan”), a €20,000 secured term loan facility for Gentherm GmbH (the “Europe Term Loan”), and a $100,000 secured revolving credit facility (the “U.S. Revolving Note”) with specific borrowing limits for foreign subsidiaries party to such agreement. The Credit Agreement allows the Company to increase the revolving credit facility or incur additional secured term loans in an aggregate amount of $50,000, subject to specified conditions. The term loans were fully drawn in 2014 and no additional amounts are available under such facilities. As of December 31, 2015, we had $86,100 available under the U.S. Revolving Note.

All obligations under the Credit Agreement (including all the obligations of any U.S. or non-U.S. loan party) are unconditionally guaranteed by Gentherm and specified U.S. subsidiaries. Additionally, such parties entered into a pledge and security agreement, granting a security interest in substantially all of their personal property to secure their respective obligations under the Credit Agreement, including the stock and membership interests of specified subsidiaries (limited to 66% of the stock in the case of certain non-U.S. subsidiaries). Further, specified foreign subsidiaries guarantee all obligations of the non-U.S. loan parties under the Credit Agreement.

The Company must maintain certain financial ratios consisting of a minimum Consolidated Fixed Charge Coverage Ratio and a maximum Consolidated Leverage Ratio as defined by the Credit Agreement. The Credit Agreement places specific restrictions on the amount of dividend payments to shareholders.

Under the Credit Agreement, U.S. Dollar denominated loans bear interest at either a base rate (“Base Rate Loans”) or Eurocurrency rate (“Eurocurrency Rate Loans”), plus a margin (“Applicable Rate”). The base rate is equal to the highest of the Federal Funds Rate (0.20% at December 31, 2015) plus 0.50%, Bank of America’s prime rate (3.50% as of December 31, 2015), or a one month Eurocurrency rate plus 1.00%. The eurocurrency rate is equal to the London Interbank Offered Rate or the Canadian Dealer Offered Rate, for Canadian Dollar loans. All loans denominated in a currency other than the U.S. Dollar must be Eurocurrency Rate Loans. Interest is payable at least quarterly.

The Applicable Rate varies based on the Consolidated Leverage Ratio of the Company, as defined by the Credit Agreement. As long as the Company is not in default of the terms and conditions of the Credit Agreement, the lowest and highest possible Applicable Rate is 1.50% and 2.00%, respectively, for Eurocurrency Rate Loans and 0.50% and 1.00%, respectively, for Base Rate Loans. Our leverage ratio as of December 31, 2015 qualified us for the lowest Applicable Rate available.

The Company also has two fixed interest rate loans with the German Investment Corporation (“DEG”), a subsidiary of KfW banking group, a German government-owned development bank.

DEG China Loan

The first, a loan we used to fund capital investments in China (the “DEG China Loan”), is subject to semi-annual principal payments that began March, 2015 and end September, 2019. Under the terms of the DEG China Loan, the Company must maintain a minimum Debt-to-Equity Ratio, Current Ratio and Debt Service Coverage Ratio, as defined by the DEG China Loan agreement, based on the financial statements of Gentherm’s wholly owned subsidiary, Gentherm Automotive Systems (China) Ltd.

DEG Vietnam Loan

The Company’s second fixed interest rate senior loan agreement with DEG was used to finance the construction and set up of the Vietnam production facility (“DEG Vietnam Loan”). The DEG Vietnam Loan is subject to semi-annual principal payments beginning November, 2017 and ending May, 2023. Under the terms of the DEG Vietnam Loan, the Company must maintain a minimum Currency Ratio, Equity Ratio and Enhanced Equity Ratio, as defined by the DEG Vietnam Loan agreement, based on the financial statements of Gentherm’s wholly owned subsidiary, Gentherm Vietnam Co. Ltd.

Note 5 — Debt (Continued)

As of December 31, 2015, we were in compliance with all terms as outlined in the Credit Agreement, DEG China Loan and DEG Vietnam Loan. The following table summarizes the Company’s debt at December 31, 2015.

	Interest Rate			Principal Balance
Credit Agreement:
U.S. Term Loan		2.11	%	$	46,875
Europe Term Loan		1.50	%		20,369
U.S. Revolving Note		1.92	%		12,000
DEG China Loan		4.25	%		3,497
DEG Vietnam Loan		5.21	%		15,000
Total debt				$	97,741
Current portion					(4,909	)
Long-term debt, less current maturities				$	92,832

The following table summarizes the Company’s debt at December 31, 2014.

	Interest Rate			Principal Balance
Credit Agreements:
U.S. Term Loan		2.00	%	$	49,375
Europe Term Loan		1.81	%		23,963
U.S. Revolving Note		1.92	%		12,000
DEG China Loan		4.25	%		4,805
Capital lease		4.20	%		632
Total debt				$	90,775
Current portion					(5,306	)
Long-term debt, less current maturities				$	85,469

The scheduled principal maturities of our debt as of December 31, 2015 is as follows:

Year	U.S. Term Loan		Europe Term Loan		U.S. Revolving Note		DEG China Loan		DEG Vietnam Loan		Total
2016	$	2,813	$	1,222	$	—	$	874	$	—	$	4,909
2017		3,750		1,630		—		874		1,250		7,504
2018		4,062		1,765		—		874		2,500		9,201
2019		36,250		15,752		12,000		875		2,500		67,377
2020		—		—		—		—		2,500		2,500
Thereafter		—		—		—		—		6,250		6,250
Total	$	46,875	$	20,369	$	12,000	$	3,497	$	15,000	$	97,741

Accounting for Stock Based Compensation

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Accounting for Stock Based Compensation

Note 6 — Accounting for Stock Based Compensation

On May 16, 2013, the Compensation Committee of the Company’s Board of Directors (the “Board”) approved the Gentherm Incorporated 2013 Equity Incentive Plan (the “2013 Plan”), covering 3,500,000 shares of our Common Stock. The 2013 Plan permits the granting of various awards including stock options (including both nonqualified options and incentive options), stock appreciation rights (“SARs”), restricted stock and restricted stock units, performance shares and certain other awards to employees, outside directors and consultants and advisors of the Company. All shares of our Common Stock that remained available for issuance under the Amended and Restated 2006 Stock Incentive Plan (the “2006 Plan”) and the Gentherm Incorporated 2011 Equity Incentive Plan (the “2011 Plan”), totaling 2,315,578 shares in the aggregate, were reduced to zero; however certain options under the 2011 and 2006 Plans, as well as certain options under the 1997 Stock Incentive Plan, which expired in 2007, are still outstanding. As of December 31, 2015 the Company had an aggregate of 1,676,586 shares of Common Stock available to issue under the 2013 Plan.

All plans are administered by the Compensation Committee of the Board. The selection of participants, allotment of shares, determination of price and other conditions are determined by the Board at its sole discretion, in order to attract and retain personnel instrumental to the success of the Company. Stock options, for example, granted under such plans have lives for a period of up to ten years from the date of grant at an exercise price which is not less than the fair market value of the Common Stock on the date of the grant.

During the three year period ended December 31, 2015, the Company has issued stock options, SARs and restricted stock awards to employees, directors and consultants. These awards become available to the recipient upon the satisfaction of a vesting condition, either based on a period of service or based on the performance of a specific achievement. For equity based awards with a service condition, the requisite service period typically ranges between three to five years for employees and consultants and one year for directors. As of December 31, 2015, 49,800 performance based, unvested SARs were outstanding. All other outstanding, unvested equity based awards were service based. Equity based award vesting may be accelerated at the discretion of the Board.

Total unrecognized compensation cost related to nonvested options, restricted stock and SARs outstanding under all of the Company’s equity plans was $20,117 and $16,590 as of December 31, 2015 and 2014, respectively. That cost is expected to be recognized over a weighted average period of two years. Compensation expense for the years ended December 31, 2015, 2014 and 2013 was $12,316, $8,601 and $3,103, respectively.

Stock Options

The following table summarizes stock option activity during the three year period ended December 31, 2015:

Options	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2012		2,129,929		$	8.82
Granted		510,000			19.64
Exercised		(672,753	)		7.21
Forfeited		(24,000	)		11.27
Outstanding at December 31, 2013		1,943,176		$	12.19		5.31	$	28,379
Granted		605,000			30.15
Exercised		(731,142	)		9.84
Forfeited		(142,500	)		18.94
Outstanding at December 31, 2014		1,674,534		$	19.14		5.10	$	29,886
Granted		524,534			41.97
Exercised		(571,723	)		16.21
Forfeited		(96,500	)		28.47
Outstanding at December 31, 2015		1,530,845		$	27.46		4.97	$	30,573
Exercisable at December 31, 2013		1,055,176		$	12.21		4.58	$	19,314
Exercisable at December 31, 2014		632,034		$	10.13		3.97	$	16,744
Exercisable at December 31, 2015		439,561		$	$12.18		3.51	$	15,480

Note 6 — Accounting for Stock Based Compensation (Continued)

The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model. This model incorporates certain assumptions for inputs including a risk-free interest rate, expected dividend yield of the underlying Common Stock, expected option life and expected volatility in the market value of the underlying Common Stock. The following assumptions were used for options issued in the following periods:

	2015	2014	2013
Expected volatility	35%	37%	34%
Weighted average expected volatility	35%	37%	34%
Expected lives	3 yrs.	3 yrs.	3 yrs.
Risk-free interest rate	1.00%	0.60-1.00%	0.57-0.65%
Expected dividend yield	none	none	none

Expected volatilities are based on the historical volatility of the Company’s Common Stock. The Company uses historical exercise data and several other factors in developing an assumption for the expected lives of stock options, including the average holding period of outstanding options and their remaining terms. The risk-free interest rate is based upon quoted market yields for United States Treasury debt securities. The expected dividend yield is based upon the Company’s history of having never issued a dividend, the limitations to issue a dividend under terms of the Credit Agreement and management’s current expectation regarding future dividends. We do not expect any of the options granted to be forfeited for purposes of computing fair value.

The weighted-average grant-date fair value of options granted during the year ended December 31, 2015, 2014 and 2013 was $10.60, $7.88 and $4.71, respectively. The total intrinsic value of options exercised during the year ended December 31, 2015, 2014 and 2013 was $18,745, $21,249 and $8,301, respectively.

Restricted Stock

The following table summarizes restricted stock activity during the three year period ended December 31, 2015:

Unvested Restricted Shares	Shares			Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2012		162,258		$	13.23
Granted		183,967			18.78
Vested		(102,258	)		13.59
Forfeited		—			—
Outstanding at December 31, 2013		243,967		$	17.43
Granted		104,584			27.79
Vested		(129,092	)		16.45
Forfeited		(42,375	)		19.77
Outstanding at December 31, 2014		177,084		$	23.70
Granted		108,026			44.01
Vested		(82,084	)		23.86
Forfeited		(24,000	)		30.87
Outstanding at December 31, 2015		179,026		$	34.92

The total fair value of shares vested in 2015, 2014 and 2013 was $4,088, $5,329 and $2,076, respectively.

Note 6 — Accounting for Stock Based Compensation (Continued)

Stock Appreciation Rights

The following table summarizes SARs activity during the three year period ended December 31, 2015:

Stock Appreciation Rights	Units			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2013		495,000		$	19.19
Granted		754,000			34.70
Exercised		(68,750	)		19.10
Forfeited		(120,000	)		21.46
Outstanding at December 31, 2014		1,060,250		$	29.97		6.11	$	9,991
Granted		259,600			43.97
Exercised		(167,500	)		23.90
Forfeited		(102,500	)		27.82
Outstanding at December 31, 2015		1,049,850		$	34.61		5.46	$	13,425
Exercisable at December 31, 2014		35,000		$	19.43		5.53	$	602
Exercisable at December 31, 2015		153,575		$	38.12		5.59	$	1,425

The total intrinsic value of SARs converted during the year ended December 31, 2015, 2014 and 2013 was $4,185, $2,072 and $0, respectively

Earnings per Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings per Share

Note 7 — Earnings per share

The Company’s diluted earnings per share give effect to all potential common shares outstanding during a period that do not have an anti-dilutive impact to the calculation. The following summarizes the shares included in the dilutive shares as disclosed in the statements of income:

	Year ended December 31,
	2015		2014		2013
Weighted average number of shares for calculation of basic EPS – Common Stock		36,031,792		35,411,608		33,652,646
Stock options under equity incentive plans		443,310		637,723		470,995
Weighted average number of shares for calculation of diluted EPS – Common Stock		36,475,102		36,049,331		34,123,641

The accompanying table represents Common Stock issuable upon the exercise of certain stock options and that have been excluded from the diluted earnings calculation because the effect of their inclusion would be anti-dilutive.

	Year ended December 31,
	2015		2014		2013
Stock options outstanding for equity incentive plans		17,534		155,000		550,000

See Note 6 for information about the Company’s different equity incentive plans.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 8 — Commitments and contingencies

The Company’s operating leases cover primarily buildings, office equipment and automobiles. A summary of lease and construction commitments as of December 31, 2015, under all non-cancelable operating leases with terms exceeding one year is as follows:


2016	$	6,464
2017		4,250
2018		3,050
2019		2,553
2020		1,952
2021 or later		5,812
Total	$	24,081

Rent expense under all of the Company’s operating leases was $6,660, $6,331 and $5,992 for 2015, 2014 and 2013, respectively.

We are subject to litigation from time to time in the ordinary course of our business; however there is no current material pending litigation to which we are a party as of December 31, 2015. On December 2, 2015, we settled an ongoing legal dispute with UnicCredit Bank regarding a currency related swap agreement and related offsetting derivative contract. See Note 13 for additional information regarding the settlement of these agreements. No other material legal proceeding was terminated, settled or otherwise resolved during the fiscal year ended December 31, 2015.

Shareholder Rights Plan	12 Months Ended
Shareholder Rights Plan	Dec. 31, 2015
Warrants And Rights Note Disclosure [Abstract]
Shareholder Rights Plan	Note 9 — Shareholder Rights Plan The Company’s Board has the authority to issue up to 4,991,000 shares of Preferred Stock and to determine the price, rights (including conversion rights), preferences and privileges of those shares without any further vote or action by the shareholders. Consistent with this authority, in January, 2009 our Board adopted a Shareholder Rights Plan (as amended the “Rights Plan”) in which one purchase right was distributed as a dividend on each share of Common Stock held of record as of the close of business on February 10, 2009 (the “Rights”). The Rights Plan will expire in January, 2019. If exercisable, each Right will entitle its holder to purchase from the Company one one-thousandth of a share of a newly created Series B Preferred Stock of the Company for $20.00 (the “Purchase Price”). The Rights will become exercisable if any person or group becomes the beneficial owner of 15% or more of the Company’s Common Stock or has commenced a tender or exchange offer which, if consummated, would result in any person or group becoming the beneficial owner of 15% or more of the Company’s Common Stock. If any person or group becomes the beneficial owner of 15% or more of the Company’s Common Stock, each right will entitle its holder, other than the acquiring person, to purchase a number of shares of the Company’s or the acquirer’s Common Stock having a value of twice the Purchase Price. The Rights are deemed attached to the certificates representing outstanding shares of Common Stock.

Segment Reporting

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Segment Reporting

Note 10 — Segment Reporting

Segment information is used by management for making operating decisions for the Company. Management evaluates the performance of the Company’s segments based primarily on operating income or loss (see Note 2).

The Company’s reportable segments are as follows:

Automotive — this segment represents the design, development, manufacturing and sales of automotive seat comfort systems, specialized automotive cable systems and certain automotive and non-automotive thermal convenience products.

Industrial — the combined operating results of GPT and Gentherm’s advanced research and development division. Advanced research and development includes efforts focused on improving the efficiency of thermoelectric technologies and advanced heating wire technology as well as other applications. The segment includes government sponsored research projects.

Reconciling Items — include corporate selling, general and administrative costs and acquisition transaction costs.

Note 10 — Segment Reporting (Continued)

The tables below present segment information about the reported product revenues and operating income of the Company for years ended December 31, 2015, 2014 and 2013. With the exception of goodwill, asset information by segment is not reported since the Company does not manage assets at a segment level. As of December 31, 2015, goodwill assigned to our Automotive and Industrial segments were $21,614 and $6,151, respectively. As of December 31, 2014, goodwill assigned to our Automotive and Industrial segments were $24,140 and $6,258, respectively.

	Automotive		Industrial			Reconciling Items			Consolidated Total
2015:
Product revenues	$	810,567	$	45,878		$	—		$	856,445
Depreciation and amortization		27,251		1,726			2,052			31,029
Operating income (loss)		170,358		(2,461	)		(46,578	)		121,319
2014:
Product revenues	$	787,065	$	24,235		$	—		$	811,300
Depreciation and amortization		30,016		2,114			2,899			35,029
Operating income (loss)		144,645		(9,661	)		(36,550	)		98,434
2013:
Product revenues	$	662,082	$	—		$	—		$	662,082
Depreciation and amortization		28,439		323			2,487			31,249
Operating income (loss)		91,255		(5,860	)		(35,011	)		50,384

The Industrial operating loss is net of reimbursement for developmental expense of $9,607, $8,885 and $2,324 for the years ended 2015, 2014 and 2013, respectively. Reconciling items include selling, general and administrative costs of $46,578, $36,214 and $32,597, respectively, for the years ended December 31, 2015, 2014 and 2013 and acquisition costs $1,075 and $2,414 for the years ended December 31, 2014 and 2013, respectively.

Revenue (based on shipment destination) by geographic area is as follows:

	2015		%			2014		%			2013		%
United States	$	393,206		46	%	$	361,706		45	%	$	292,079		44	%
South Korea		84,758		10	%		89,515		11	%		58,329		9	%
China		76,864		9	%		69,910		9	%		70,671		11	%
Germany		74,003		9	%		90,243		11	%		84,035		13	%
Japan		46,058		5	%		47,528		6	%		39,844		6	%
Mexico		28,274		3	%		19,590		2	%		15,670		2	%
Czech Republic		28,273		3	%		25,738		3	%		17,247		3	%
Canada		27,076		3	%		20,293		2	%		14,254		2	%
United Kingdom		25,952		3	%		24,712		3	%		18,864		3	%
Other		71,981		9	%		62,065		8	%		51,089		7	%
Total Non U.S.		463,239		54	%		449,594		56	%		370,003		56	%
	$	856,445		100	%	$	811,300		100	%	$	662,082		100	%

We rely on three customers, two domestic and one foreign, to derive a significant portion of our product revenues. The table below lists the percentage of total product revenues generated from sales to these customers:

	2015			2014			2013
Johnson Controls (domestic)		23	%		24	%		27	%
Lear (domestic)		22	%		21	%		18	%
Bosch (foreign)		9	%		9	%		10	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-Publisher FASB
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+ Details

Pension and Other Post Retirement Benefit Plans

12 Months Ended

Dec. 31, 2015

Compensation And Retirement Disclosure [Abstract]

Pension and Other Post Retirement Benefit Plans

Note 11 — Pension and Other Post Retirement Benefit Plans

On August 8, 2008 the Company established The Executive Nonqualified Defined Benefit Plan of Gentherm Incorporated (the “Plan”), an unfunded executive pension plan, with an effective date of April 1, 2008. The Company’s Chief Executive Officer, is the only participant in the Plan which will, if fully vested, provide for 15 annual retirement benefit payments of $300,000 each beginning January 1, 2018. The participant will become entitled to receive such retirement benefit payments, or a portion thereof, through his continuous service to the Company over a six year period starting on April 1, 2011.

The Company records a projected benefit obligation representing the present value of future plan benefits when earned by the participant. The following table sets forth the benefit obligation, amounts recognized in the Company’s financial statements and the principal assumptions used:

	2015			2014
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	2,474		$	1,848
Service cost		379			335
Interest cost		80			78
Actuarial (gain) loss		(35	)		213
Benefit obligation at end of year	$	2,898		$	2,474

The entire benefit obligation from the Plan is classified as a non-current liability within pension benefit obligations in the Company’s consolidated balance sheet. Service and interest cost is included in selling, general and administrative expenses in the Company’s consolidated statements of income and actuarial gains and losses are included the Company’s consolidated balance sheet as part of accumulated other comprehensive income within shareholders’ equity. Actuarial losses are amortized to selling, general and administrative expense in the Company’s consolidated statements of income based on the average future service life of the Plan. A discount rate assumption of 3.40%, 3.25% and 4.25% was used to determine the benefit obligation for the years ended December 31, 2015, 2014 and 2013, respectively. A discount rate assumption of 3.25%, 4.25% and 3.25% was used to determine and the net periodic service cost for years ended December 31, 2015, 2014 and 2013, respectively. We do not expect contributions to be paid to the Plan during the next fiscal year.

Although the Plan is not funded, the Company has established a separate trust having the sole purpose of paying benefits under the Plan. The only asset of the trust is a corporate-owned life insurance policy (“COLI”). The COLI is valued at fair value using quoted prices listed in active markets (Level 1 input based on the U.S. GAAP fair value hierarchy). The policy value of the COLI was $1,993 and $2,056 as of December 31, 2015 and 2014, respectively, and was included in other non-current assets.

Components of the Plan’s net periodic pension benefit cost for the years ended December 31, 2015, 2014 and 2013 are as follows:

	2015		2014		2013
Service cost	$	379	$	335	$	355
Interest cost		80		78		53
Amortization of actuarial losses		27		—		37
Net periodic benefit cost	$	486	$	413	$	445

Pretax amounts recognized in other comprehensive income for the years ended December 31, 2015, 2014 and 2013 are as follows


	2015			2014		2013
Actuarial (Gains)/losses	$	(35	)	$	213	$	(193	)
Amortization of actuarial losses		(27	)		—		(37	)
	$	(62	)	$	213	$	(230	)

Tax expense of $23 was recognized in other comprehensive income related to the Plan for the year ended December 31, 2015. Tax benefit of $121 was recognized in other comprehensive income related to the Plan for the year ended December 31, 2014. No tax impacts were recognized in other comprehensive income related to the Plan for the year ended December 31, 2013.

Note 11 — Pension and Other Post Retirement Benefit Plans (Continued)

Pretax unrecognized actuarial losses recorded in accumulated other comprehensive loss not yet recognized in net periodic benefit cost were $266 and $328 as of December 31, 2015 and 2014, respectively. No amount of pretax unrecognized actuarial loss recorded in accumulated other comprehensive income as of December 31, 2015 are expected to be recognized as components of net periodic benefit cost in the year ending December 31, 2016.

Gentherm GmbH has an established defined benefit plan for retired and current members of its executive management team.

Gentherm GmbH records a projected benefit obligation representing the present value of future plan benefits when earned by the participant. The following table sets forth the benefit obligation and amounts recognized in the Company’s financial statements:

	2015			2014
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	8,120		$	6,019
Service cost		—			304
Interest cost		142			181
Paid pension distributions		(257	)		(278	)
Actuarial (gains)/losses		(182	)		1,385
Past service cost		—			1,271
Exchange rate impact		(843	)		(762	)
Benefit obligation at end of year	$	6,980		$	8,120

The following table sets forth the fair value of the plan assets for the periods ending December 31, 2015 and 2014:

	2015			2014
Change in plan assets:
Plan assets at beginning of year	$	3,615		$	2,340
Actual return on plan assets		126			89
Contributions		257			1,236
Paid pension distributions		(257	)		(278	)
Actuarial gains/(losses)		(28	)		531
Exchange rate impact		(380	)		(303	)
Plan assets at end of year	$	3,333		$	3,615

The $3,647 net liability from the Gentherm GmbH plan is classified as a noncurrent liability in pension benefit obligation.

Pretax amounts recognized in other comprehensive income for the years ended December 31, 2015, 2014 and 2013 are as follows:


	2015			2014		2013
Actuarial (gains)/losses	$	(154	)	$	1,916	$	67
Amortization of actuarial losses		(59	)		166		37
Amortization of prior service cost		(572	)		—		—
	$	(785	)	$	2,082	$	104

A tax expense of $211 was recognized in other comprehensive income related to the Gentherm GmbH defined benefit plan for the year ended December 31, 2015. Tax benefits of $559 and $18 were recognized in other comprehensive income for the years ended December 31, 2014 and 2013, respectively.

Pretax unrecognized actuarial losses recorded in accumulated other comprehensive loss not yet recognized in net periodic benefit cost were $1,821 and $2,267 as of December 31, 2015 and 2014, respectively. We expect $47 of pretax unrecognized actuarial loss recorded in accumulated other comprehensive income as of December 31, 2015 to be recognized as components of net periodic benefit cost in the year ending December 31, 2016.

Note 11 — Pension and Other Post Retirement Benefit Plans (Continued)

Components of the Plan’s net periodic pension benefit cost for the years ended December 31, 2015, 2014 and 2013 are as follows:

	2015			2014			2013
Service cost	$	—			304			—
Interest cost		142			181			180
Return on plan assets		(126	)		(89	)		(59	)
Amortization of prior service cost		572			—			—
Amortization of actuarial loss (gains)		59			(166	)		(37	)
Net periodic benefit cost	$	647			230			84

The Gentherm GmbH defined benefit plan is underfunded by $3,647 and $4,505 as of December 31, 2015 and 2014, respectively. The portion of the net benefit obligation payable within the next 12 months and included in the Company’s consolidated balance sheet within accrued liabilities was $0 and $274 for December 31, 2015 and 2014, respectively . The long-term portion of the net benefit obligation is included in pension benefit obligation. The net periodic benefit cost is included in selling, general and administrative expenses in the Company’s consolidated statements of income. The following table describes the actuarial assumptions used to determine the benefit obligation and the net periodic service cost:

	2015			2014
Discount rate		2.21	%		1.95	%
Expected long term rate of return on plan assets		3.70	%		3.80	%

Plan assets are comprised of Gentherm GmbH’s pension insurance policies and are pledged to the beneficiaries of the plan. A market valuation technique, based on observable underlying insurance charges, is used to determine the fair value of the pension plan assets (Level 2). The expected return on plan assets assumption used to calculate Gentherm GmbH’s pension benefit obligation was determined using actual returns realized on plan assets in the prior year. We expect to contribute $257 to the Gentherm GmbH defined benefit plan during the next fiscal year.

The schedule of expected pension payments made to Gentherm GmbH defined benefit plan participants over the next 10 years is as follows:

Year
2016	$	254
2017		253
2018		253
2019		251
2020		249
2021 - 2025		1,237
Total	$	2,497

Gentherm has adopted a 401(k) plan to provide all eligible employees a means to accumulate retirement savings on a tax-advantaged basis, and eligible executive officers can participate in this plan on the same basis as other participants. Participants may defer specified portions of their compensation. On a discretionary basis, the Company matches a portion of the employee contributions. The Plan also allows for additional discretionary contributions. Gentherm made $959, $543 and $191 in matching contributions to the 401(k) plan in 2015, 2014 and 2013, respectively.

Fair Value Measurement	12 Months Ended
Fair Value Measurement	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 12 — Fair Value Measurement The Company bases fair value on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We have adopted a fair value hierarchy to measure fair value into three broad levels, which are described below: Level 1: Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. Level 2: Inputs, other than quoted market prices included in Level 1, that are observable either directly or indirectly for the asset or liability Level 3: Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and also considers counterparty credit risk in its assessment of fair value. Except for derivative instruments (see Note 13), pension liabilities, pension plan assets and a corporate owned life insurance policy (see Note 11), the Company has no financial assets and liabilities that are carried at fair value at December 31, 2015 and 2014. The carrying amounts of financial instruments comprising cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the relatively short maturity of such instruments The Company uses an income valuation technique to measure the fair values of its debt instruments by converting amounts of future cash flows to a single present value amount using rates based on current market expectations (Level 2 inputs). As of December 31, 2015 and 2014, the carrying values of the Company’s Credit Agreement indebtedness were not materially different than their estimated fair values because the interest rates on variable rate debt approximated rates currently available to the Company (see Note 5). Discount rates used to measure the fair value of Gentherm’s DEG Vietnam Loan and DEG China Loan are based on quoted swap rates. As of December 31, 2015, the carrying values of the DEG Vietnam Loan and DEG China Loan were $15,000 and $3,497, respectively, as compared to an estimated fair value of $15,056 and $3,588, respectively. As of December 31, 2014, the carrying value of the DEG China Loan was $4,805, as compared to an estimated fair value of $4,937. Certain Company assets are required to be recorded at fair value on a non-recurring basis when events and circumstances indicate that the carrying value may not be recoverable.

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2015

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 13 — Derivative Financial Instruments

We are exposed to market risk from changes in foreign currency exchange rates, short-term interest rates and price fluctuations of certain material commodities such as copper. Market risks for changes in interest rates relate primarily to our debt obligations under our Credit Agreement. Foreign currency exchange risks are attributable to sales to foreign customers and purchases from foreign suppliers not denominated in the location’s functional currency, foreign plant operations, intercompany indebtedness, intercompany investments and include exposures to the European Euro, Mexican Peso, Canadian Dollar, Hungarian Forint, Macedonian Denar, Ukrainian Hryvnia, Japanese Yen, Chinese Renminbi, Korean Won and Vietnamese Dong.

The Company regularly enters into derivative contracts with the objective of managing its financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the financial instruments used to hedge them. The maximum length of time over which we hedge our exposure to foreign currency exchange risks is one year. We had foreign currency derivative contracts with a notional value of $0 and $52,446 outstanding at December 31, 2015 and 2014, respectively, relating entirely to derivative contracts intended to offset the risk associated with the currency related swap (“CRS”) agreement with UniCredi Bank AG. Settlement of the CRS and offsetting foreign currency derivative contracts is discussed below.

The maximum length of time over which we hedge our exposure to price fluctuations in material commodities is two years. We had copper commodity swap contracts with a notional value of $4,885 and $0 outstanding at December 31, 2015 and 2014, respectively.

Note 13 — Derivative Financial Instruments (Continued)

We do not enter into derivative financial instruments for speculative or trading purposes. Our hedging relationships are formally documented at the inception of the hedge, and hedges must be highly effective in offsetting changes to future cash flows on hedged transactions both at the inception of a hedge and on an ongoing basis to be designated for hedge accounting treatment. For derivative contracts which can be classified as a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded to accumulated other comprehensive loss in the consolidated balance sheet. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive loss is recorded in earnings in the consolidated statement of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. We record the ineffective portion of foreign currency hedging instruments, if any, to foreign currency gain (loss) in the consolidated statements of income. All of the unrealized loss associated with foreign currency derivatives reported in accumulated other comprehensive loss as of December 31, 2014 were settled and reclassified into earnings during 2015. No amount of the unrealized loss associated with copper commodity derivatives reported in other comprehensive income during 2015 were settled and reclassified into earnings during 2015. Though we continuously monitor the hedging program, derivative positions and hedging strategies, foreign currency forward exchange agreements have not always been designated as hedging instruments for accounting purposes.

The Company uses an income approach to value derivative instruments, analyzing quoted market prices to calculate the forward values and then discounts such forward values to the present value using benchmark rates at commonly quoted intervals for the instrument’s full term.

On December 2, 2015, Gentherm GmbH (“Gentherm Germany”), a subsidiary of Gentherm Incorporated (the “Company”), entered into an agreement settling all claims against UniCredit Bank AG pertaining to a 10 year currency related swap (“CRS”) entered into by Gentherm Germany in March 2008. Prior to the settlement, a lawsuit filed by Gentherm GmbH in 2011 was pending appeal at the Higher Regional Court in Munich, Germany. As a result of the settlement, the CRS and its related liability to Gentherm have been terminated and Gentherm’s remaining interest in an offsetting derivative contract designed to limit the market risk of payments due under the CRS was sold. Gentherm realized a one-time, pre-tax gain of $9,949,000 in the fourth quarter of 2015. Gentherm made a final cash settlement payment of $7,593,000 during the fourth quarter of 2015.

Information related to the recurring fair value measurement of derivative financial instruments in our consolidated balance sheet as of December 31, 2015 is as follows :

Asset Derivatives

Liability Derivatives

Net Asset/
(Liabilities)

Hedge

Designation

Fair Value

Hierarchy

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

Commodity derivatives

Cash flow hedge

Level 2

Current liabilities

(725

)

(725

)

Information related to the recurring fair value measurement of derivative financial instruments in our consolidated balance sheet as of December 31, 2014 is as follows:

			Asset Derivatives				Liability Derivatives				Net Asset/ (Liabilities)
	Hedge Designation	Fair Value Hierarchy	Balance Sheet Location		Fair Value		Balance Sheet Location	Fair Value			Net Asset/ (Liabilities)
CRS	Not a hedge	Level 2					Current liabilities	$	(2,466	)
							Non current liabilities		(6,698	)
Total CRS								$	(9,164	)	$	(9,164	)
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	145
				Non‑current assets	$	1,345
Total foreign currency derivatives						1,490					$	1,490

Note 13 — Derivative Financial Instruments (Continued)

Information related to the effect of derivative instrument`s on our consolidated statements of income is as follows:


	Location	Year Ended December 31, 2015			Year Ended December 31, 2014
Foreign currency derivatives	Revaluation of derivatives	$	(1,102	)		640
	Product Revenues		—			(390	)
	Cost of Sales		(1,782	)		(174	)
	Selling, general and administrative		(477	)		(161	)
	Other Comprehensive Income		10			(10	)
	Foreign currency gain (loss)		351			(976	)
Total foreign currency derivatives		$	(3,000	)	$	(1,071	)
CRS	Revaluation of derivatives	$	—		$	(1,157	)
	Gain on settlement of derivatives		9,949			—	)
Total CRS		$	9,949		$	(1,157	)
Interest Rate derivatives	Revaluation of derivatives	$	—		$	(1	)
	Other Comprehensive Income		—			81
Total interest rate derivatives		$	—		$	80
Commodity derivatives	Other Comprehensive Income	$	(725	)	$	—
	Cost of Sales		(123	)		—
Total commodity derivatives		$	(848	)	$	—

We did not incur any hedge ineffectiveness during the twelve months ended December 31, 2015 and 2014.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
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+ Details

New Accounting Pronouncements	12 Months Ended
New Accounting Pronouncements	Dec. 31, 2015
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
New Accounting Pronouncements Disclosure	Note 14 — New Accounting Pronouncements Revenue from Contracts with Customers In May, 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 was developed to enable financial statement users to better understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The update’s core principal is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Companies are to use a five-step contract review model to ensure revenue gets recognized, measured and disclosed in accordance with this principal. ASU 2014-09 is effective for fiscal years and interim periods beginning after December 15, 2017. This reflects a one-year delay for required implementation announced in July, 2015. The amendments in this update should be applied retrospectively either to each prior reporting period presented or to disclose the cumulative effect recognized at the date of initial application. We have developed a plan to complete the five-step contract review process for all existing contracts with customers and are in the process of determining the impact the implementation of ASU 2014-09 will have on the Company’s financial statements. Balance Sheet Classification of Deferred Taxes In November, 2015, the FASB issued ASU 2015-17, “ Income Taxes (Topic 740) Balance Sheet Classification of Deferred Taxes.” ASU 2015-17 no longer requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts on the balance sheet. Instead, for each tax paying component and within each tax jurisdiction all deferred tax liabilities and assets, as well as related valuation allowance, shall be offset and presented as a single noncurrent amount. Entities will continue to not offset deferred tax liabilities and assets attributable to different tax-paying components of the entity or to different tax jurisdictions. ASU 2015-17 is effective for fiscal years and interim periods beginning after December 15, 2016, though earlier application is permitted. The update can be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. We anticipate adoption of ASU 2015-17 will impact our presentation of deferred tax liabilities and assets on the consolidated balance sheets. Note 14 — New Accounting Pronouncements (Continued) Business Combinations – Simplifying the Accounting for Measure-Period Adjustments In September, 2015, the FASB issued ASU 2015-16, “ Business Combinations (Topic 805) Simplifying the Accounting for Measurement-Period Adjustments.” For business combinations that are incomplete by the end of a reporting period and which provisional amounts have been reported for those incomplete items, acquirers are no longer required to account for measurement-period adjustments retrospectively. ASU 2015-16 requires the acquirer to, instead, recognize adjustments to the provisional amounts in the reporting period they are determined. The acquirer shall adjust its financial statements to recognize in its current-period earnings the full effect resulting from the change to provisional amounts calculated as if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for fiscal years and interim periods beginning after December 15, 2015 and is not expected to significantly impact the Company. Inventory – Simplifying the Measurement of Inventory In July, 2015, the FASB issued ASU 2015-11, “ Inventory (Topic 330) Simplifying the Measurement of Inventory.” The Update requires that inventory measured using any method other than last-in, first-out (LIFO) or the retail inventory method shall be measured at the lower of cost and net realizable value. ASU 2015-11 is effective for fiscal years and interim periods beginning after December 15, 2016 and is not expected to significantly impact the Company.

Gentherm Global Power Technologies

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Gentherm Global Power Technologies

Note 15 — Gentherm Global Power Technologies

GPT develops, manufactures and sells thermoelectric and non-thermoelectric power generation systems and related products. The principal application for these technologies include natural gas well and pipeline protection systems and remote power generation for instrumentation, automation and telecommunication systems.

Results of operations for GPT are included in the Company’s consolidated financial statements beginning April 1, 2014. GPT contributed $24,235 in product revenues and $776 in operating income for the year ended December 31, 2014.

Purchase Price Allocation

The purchase price of approximately $30,866, net of cash acquired of $2,954, has been allocated to the values of assets acquired and liabilities assumed as of April 1, 2014. An appraisal was completed to assist management in determining the fair value of acquired assets and assumed liabilities, including identifiable intangible assets. The final purchase price allocation is as follows:


Accounts receivable	$	10,200
Inventory		6,487
Deferred income tax assets, net		3,499
Order backlog		815
Prepaid expenses and other assets		258
Property and equipment		716
Customer relationships		5,524
Technology		2,807
Trade name		725
Goodwill		6,365
Assumed liabilities		(6,530	)
Net assets acquired		30,866
Cash acquired		2,954
Purchase price	$	33,820

Note 15 — Gentherm Global Power Technologies (Continued)

Supplemental Pro Forma Information

The unaudited pro forma combined historical results for the amounts of GPT’s revenue and earnings that would have been included in the Company’s consolidated statements of income had the acquisition occurred on January 1, 2014 and January 1, 2013 are as follows:

	Year Ended December 31,
	2014		2013
Product revenues	$	824,311	$	694,697
Net income		71,997		35,348

The pro forma information includes adjustments for the effect of the amortization of intangible assets recognized in the acquisition. This pro forma information is not necessarily indicative of future operating results.

Goodwill

We recorded goodwill of approximately $6,365 arising from the acquisition. It is estimated that none of the goodwill recognized will be deductible for income tax purposes. Goodwill represents intangible assets that do not qualify for separate recognition.

Intangible Assets

In conjunction with the acquisition, intangible assets of $9,871 were recorded. The Company’s estimate of the fair value of these assets at the time of the acquisition was determined with the assistance of an independent third-party valuation firm. As part of the estimated valuation, an estimated useful life for the assets was determined.

Intangible assets, net of accumulated amortization, consisted of the following (balances are lower as of December 31, 2014 than as of April 1, 2014, the acquisition date, due to fluctuations in foreign currency exchange rates totaling $465):

	December 31, 2014
	Gross Value		Accumulated Amortization			Net Value		Useful Life
Customer relationships	$	5,264	$	(334	)	$	4,930	12 yrs
Order backlog		777		(777	)		—	0.5 yrs
Technology		2,675		(204	)		2,471	10 yrs
Trade name		690		(150	)		540	3.5 yrs
Total	$	9,406	$	(1,465	)	$	7,941

Amortization expense of $1,962 for the year ended December 31, 2014 was recorded as follows:

	Year Ended December 31, 2014
Product revenues	$	(350	)
Selling, general and administrative expense		1,612

Amortization expense for the prospective five years is estimated to be as follows:

2015	$	903
2016		903
2017		854
2018		706
2019		706

Note 15 — Gentherm Global Power Technologies (Continued)

Property and Equipment

Property and equipment consist of the following:

Asset Category	Useful Life	Amount
Land	Indefinite	$	15
Buildings	20 yrs		81
Leasehold improvements	5-7 yrs		28
Machinery and equipment	2-5 yrs		423
Computer hardware and software	3-5 yrs		169
		$	716

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2015

Valuation And Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

GENTHERM INCORPORATED

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2015, 2014 and 2013

(In thousands)

Description	Balance at Beginning of Period		Charged to Costs and Expenses		Charged to Other Accounts			Deductions from Reserves			Balance at End of Period
Allowance for Doubtful Accounts
Year Ended December 31, 2013		2,474		1,723		(8	)		(2,382	)		1,807
Year Ended December 31, 2014		1,807		2,043		(105	)		(898	)		2,847
Year Ended December 31, 2015		2,847		4,174		(123	)		(4,059	)		2,839
Allowance for Deferred Income Tax Assets
Year Ended December 31, 2013		2,199		—		—			—			2,199
Year Ended December 31, 2014		2,199		—		16,674			(836	)		18,037
Year Ended December 31, 2015		18,037		—		(2,436	)		(2,183	)		13,418
Reserve for Inventory
Year Ended December 31, 2013		2,185		779		(25	)		(6	)		2,933
Year Ended December 31, 2014		2,933		2,204		(181	)		(154	)		4,802
Year Ended December 31, 2015		4,802		815		(249	)		(1,060	)		4,308

Summary of Significant Accounting Policies and Basis of Presentation (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Consolidation

Cash and Cash Equivalents

Disclosures About Fair Value of Financial Instruments

Use of Estimates

Accrued Warranty Costs


	December 31,
	2015			2014
Balance at beginning of year	$	5,221		$	10,308
Warranty claims paid or retired		(1,654	)		(1,102	)
Reversal of previously recorded liability		—			(3,744	)⁽¹⁾
Expense		1,339			555
Adjustment due to currency translation		(348	)		(796	)
Balance at end of year	$	4,558		$	5,221

(1)

Concentration of Credit Risk

Allowance for Doubtful Accounts

Inventory

	December 31,
	2015			2014
Balance at beginning of year	$	4,802		$	2,933
Expense		815			2,204
Inventory write off		(1,060	)		(154	)
Adjustment due to currency translation		(249	)		(181	)
Balance at end of year	$	4,308		$	4,802

Property and Equipment

Depreciation and amortization are computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:

Asset Category		Useful Life
Buildings and building improvements		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		2 to 5 years
Leasehold improvements		Term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Term of lease

The Company recognized depreciation expense of $16,360, $14,930 and $14,810 for the years ended December 31, 2015, 2014 and 2013, respectively.

Goodwill and Other Intangible Assets

December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398
Goodwill adjustment arising from the acquisition of GPT		107
Exchange rate impact		(2,740	)
December 31, 2015	$	27,765

The fair value and corresponding useful lives for acquired intangible assets are listed below as follows:

Asset Category		Useful Life
Customer relationships		10-15 years
Order Backlog		0.5 years
Technology		8-10 years
Production Development Costs		4 years

A total of $12,751, $16,941 and $17,570 in other intangible assets, including capitalized patent costs, were amortized in 2015, 2014 and 2013, respectively.

An estimate of intangible asset amortization by year, is as follows:

2016	$	11,569
2017		10,893
2018		8,356
2019		8,336
2020		8,336
Thereafter		971

Impairments of Long-Lived Assets, Other Intangible Assets and Goodwill

Note 2 — Summary of Significant Accounting Policies and Basis of Presentation (Continued)

Product Revenues

Tooling

Research and Development Expenses

Income Taxes

Derivative Financial Instruments - Hedge Accounting

Derivative Financial Instruments – Hedge Accounting

Earnings Per Share

Earnings per Share

Stock Based Compensation

Pension Plans

Subsequent Events

Revenue from Contracts with Customers

In May, 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 was developed to enable financial statement users to better understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The update’s core principal is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Companies are to use a five-step contract review model to ensure revenue gets recognized, measured and disclosed in accordance with this principal.

ASU 2014-09 is effective for fiscal years and interim periods beginning after December 15, 2017. This reflects a one-year delay for required implementation announced in July, 2015. The amendments in this update should be applied retrospectively either to each prior reporting period presented or to disclose the cumulative effect recognized at the date of initial application. We have developed a plan to complete the five-step contract review process for all existing contracts with customers and are in the process of determining the impact the implementation of ASU 2014-09 will have on the Company’s financial statements.

Balance Sheet Classification of Deferred Taxes

In November, 2015, the FASB issued ASU 2015-17, “ Income Taxes (Topic 740) Balance Sheet Classification of Deferred Taxes.” ASU 2015-17 no longer requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts on the balance sheet. Instead, for each tax paying component and within each tax jurisdiction all deferred tax liabilities and assets, as well as related valuation allowance, shall be offset and presented as a single noncurrent amount. Entities will continue to not offset deferred tax liabilities and assets attributable to different tax-paying components of the entity or to different tax jurisdictions.

ASU 2015-17 is effective for fiscal years and interim periods beginning after December 15, 2016, though earlier application is permitted. The update can be applied either prospectively to all deferred tax liabilities and assets or retrospectively to all periods presented. We anticipate adoption of ASU 2015-17 will impact our presentation of deferred tax liabilities and assets on the consolidated balance sheets.

Business Combinations – Simplifying the Accounting for Measure-Period Adjustments

In September, 2015, the FASB issued ASU 2015-16, “ Business Combinations (Topic 805) Simplifying the Accounting for Measurement-Period Adjustments.” For business combinations that are incomplete by the end of a reporting period and which provisional amounts have been reported for those incomplete items, acquirers are no longer required to account for measurement-period adjustments retrospectively. ASU 2015-16 requires the acquirer to, instead, recognize adjustments to the provisional amounts in the reporting period they are determined. The acquirer shall adjust its financial statements to recognize in its current-period earnings the full effect resulting from the change to provisional amounts calculated as if the accounting had been completed at the acquisition date.

ASU 2015-16 is effective for fiscal years and interim periods beginning after December 15, 2015 and is not expected to significantly impact the Company.

Inventory Simplifying the Measurement of Inventory

Inventory – Simplifying the Measurement of Inventory

In July, 2015, the FASB issued ASU 2015-11, “ Inventory (Topic 330) Simplifying the Measurement of Inventory.” The Update requires that inventory measured using any method other than last-in, first-out (LIFO) or the retail inventory method shall be measured at the lower of cost and net realizable value.

ASU 2015-11 is effective for fiscal years and interim periods beginning after December 15, 2016 and is not expected to significantly impact the Company.

Summary of Significant Accounting Policies and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2015

Reconciliation of Changes in Accrued Warranty Costs


	December 31,
	2015			2014
Balance at beginning of year	$	5,221		$	10,308
Warranty claims paid or retired		(1,654	)		(1,102	)
Reversal of previously recorded liability		—			(3,744	)⁽¹⁾
Expense		1,339			555
Adjustment due to currency translation		(348	)		(796	)
Balance at end of year	$	4,558		$	5,221

(1)

Reconciliation of Changes in Inventory Reserve

	December 31,
	2015			2014
Balance at beginning of year	$	4,802		$	2,933
Expense		815			2,204
Inventory write off		(1,060	)		(154	)
Adjustment due to currency translation		(249	)		(181	)
Balance at end of year	$	4,308		$	4,802

Estimated Useful Lives of Property and Equipment

Depreciation and amortization are computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:

Asset Category		Useful Life
Buildings and building improvements		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		2 to 5 years
Leasehold improvements		Term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Term of lease

Roll Forward of Goodwill from Acquisition

December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398
Goodwill adjustment arising from the acquisition of GPT		107
Exchange rate impact		(2,740	)
December 31, 2015	$	27,765

Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets

The fair value and corresponding useful lives for acquired intangible assets are listed below as follows:

Asset Category		Useful Life
Customer relationships		10-15 years
Order Backlog		0.5 years
Technology		8-10 years
Production Development Costs		4 years

Estimate of Total Intangible Asset Amortization

Amortization expense for the prospective five years is estimated to be as follows:

2015	$	903
2016		903
2017		854
2018		706
2019		706

W.E.T

Estimate of Total Intangible Asset Amortization

An estimate of intangible asset amortization by year, is as follows:

2016	$	11,569
2017		10,893
2018		8,356
2019		8,336
2020		8,336
Thereafter		971

Details of Certain Financial Statement Components (Tables)

12 Months Ended

Dec. 31, 2015

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components

	December 31,
	2015			2014
Inventory:
Raw materials, net of reserve	$	50,371		$	48,678
Work in process, net of reserve		4,150			4,009
Finished goods, net of reserve		29,662			24,956
	$	84,183		$	77,643
Property and equipment:
Buildings, plant and equipment	$	103,841		$	76,239
Automobiles		502			499
Production tooling		11,702			11,256
Leasehold improvements		7,546			7,331
Computer equipment and software		17,371			15,560
Construction in progress		12,302			8,063
		153,264			118,948
Less: Accumulated depreciation *		(34,107	)		(27,221	)
	$	119,157		$	91,727
Other intangible assets:
Customer relationships	$	68,296		$	77,026
Technology		29,473			32,467
Product development costs		10,286			12,392
	$	108,055		$	121,885
Less: Accumulated amortization		(59,594	)		(53,756	)
	$	48,461		$	68,129
Accrued liabilities:
Tax accruals	$	18,205		$	15,696
Accrued warranty		4,558			5,221
Accrued employee liabilities		19,481			19,783
Liabilities from discounts and rebates		8,348			8,429
Other accrued liabilities		10,231			19,258
	$	60,823		$	68,387

*	Includes accumulated amortization of capital lease obligations.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Deferred Tax Assets and Deferred Tax Liabilities

The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following:

	December 31,
	2015			2014
Deferred tax assets:
Derivative financial instruments	$	267		$	2,461
Net operating losses		5,525			7,075
Research and development credits		21,494			26,204
Depreciation		3,886			3,456
Valuation reserves and accrued liabilities		5,553			4,788
Foreign tax credit		1,654			823
Stock compensation		3,129			2,006
Inventory		1,622			1,443
Patents		156			138
Defined benefit obligation		2,011			1,479
Other credits		639			593
Other		10			144
		45,946			50,610
Valuation allowance		(13,418	)		(18,037	)
Deferred tax liabilities:
Intangible assets		(10,161	)		(14,593	)
Unrealized foreign currency exchange gains		(3,797	)		(2,855	)
Undistributed profits of subsidiary		(3,254	)		(293	)
Property and equipment		(696	)		(162	)
Other		(342	)		(384	)
		(18,250	)		(18,287	)
Net deferred tax asset (liability)	$	14,278		$	14,286

Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate

Reconciliations between the statutory Federal income tax rate of 34% and the effective rate of income tax expense for each of the three years in the period ended December 31, 2015 are as follows:

	Year Ended December 31,
	2015			2014			2013
Statutory Federal income tax rate		34.0	%		34.0	%		34.0	%
Increase (Decrease) resulting from:
U.S. Taxes on foreign income, net of taxes paid credit		1.0	%		0.3	%		(1.7	%)
Change in valuation allowance		(1.9	%)		(0.8	%)		—
Foreign, state and local tax, net of Federal benefit		1.6	%		1.9	%		3.6	%
Nondeductible expenses		1.8	%		1.8	%		1.4	%
Stock option compensation		(0.1	%)		(0.1	%)		(0.5	%)
Research and development credits		(0.9	%)		(0.5	%)		(2.3	%)
Effect of different tax rates of foreign jurisdictions		(12.1	%)		(10.0	%)		(10.8	%)
Undistributed profits of subsidiaries		2.4	%		—			—
Other tax exempt income		(0.1	%)		(0.9	%)		—
Other		0.3	%		(0.1	%)		0.3	%
Effective rate		26.0	%		25.6	%		24.0	%

Net Operating Loss Carryforwards

The Company has Net Operating Loss (“NOL”) carryforwards as follows:

Jurisdiction	Amount as of December 31, 2015		Years of Expiration
U.S. Federal and state income tax	$	47,869		2018- 2034
Foreign	$	5,719		2018-2020
Foreign	$	5,000		Indefinite

Earnings Before for Income Taxes

The earnings before for income taxes and our tax provision are comprised of the following:

	Year Ended December 31,
	2015		2014		2013
Income before income taxes:
Domestic	$	25,508	$	11,170	$	6,891
Foreign		103,430		83,051		39,339
Total income before income taxes	$	128,938	$	94,221	$	46,230

Provision for Income Taxes

	Year Ended December 31,
	2015			2014			2013
Current income tax expense:
Federal	$	8,428		$	4,005		$	690
State and local		606			(15	)		495
Foreign		24,622			24,737			9,959
Total current income tax expense	$	33,656		$	28,727		$	11,144
Deferred income tax expense (benefit):
Federal	$	(3,051	)	$	(576	)	$	12
State and local		(183	)		9			(95	)
Foreign		3,123			(4,058	)		36
Total deferred income tax expense	$	(111	)	$	(4,625	)	$	(47	)
Total tax expense	$	33,545		$	24,102		$	11,097

Reconciliation of Unrecognized Tax Benefits

The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	Year Ended December 31,
	2015			2014			2013
Balance at beginning of year	$	4,651		$	2,241		$	2,191
Additions based on tax position related to current year		—			43			2
Additions based on tax positions related to prior year		262			2,991			580
Reductions from settlements and statute of limitation expiration		(19	)		(432	)		(599	)
Effect of foreign currency translation		(451	)		(192	)		67
Balance at end of year	$	4,443		$	4,651		$	2,241

Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Summary of Company's Debt

The following table summarizes the Company’s debt at December 31, 2015.

	Interest Rate			Principal Balance
Credit Agreement:
U.S. Term Loan		2.11	%	$	46,875
Europe Term Loan		1.50	%		20,369
U.S. Revolving Note		1.92	%		12,000
DEG China Loan		4.25	%		3,497
DEG Vietnam Loan		5.21	%		15,000
Total debt				$	97,741
Current portion					(4,909	)
Long-term debt, less current maturities				$	92,832

The following table summarizes the Company’s debt at December 31, 2014.

	Interest Rate			Principal Balance
Credit Agreements:
U.S. Term Loan		2.00	%	$	49,375
Europe Term Loan		1.81	%		23,963
U.S. Revolving Note		1.92	%		12,000
DEG China Loan		4.25	%		4,805
Capital lease		4.20	%		632
Total debt				$	90,775
Current portion					(5,306	)
Long-term debt, less current maturities				$	85,469

Principal Maturities of Debt

The scheduled principal maturities of our debt as of December 31, 2015 is as follows:

Year	U.S. Term Loan		Europe Term Loan		U.S. Revolving Note		DEG China Loan		DEG Vietnam Loan		Total
2016	$	2,813	$	1,222	$	—	$	874	$	—	$	4,909
2017		3,750		1,630		—		874		1,250		7,504
2018		4,062		1,765		—		874		2,500		9,201
2019		36,250		15,752		12,000		875		2,500		67,377
2020		—		—		—		—		2,500		2,500
Thereafter		—		—		—		—		6,250		6,250
Total	$	46,875	$	20,369	$	12,000	$	3,497	$	15,000	$	97,741

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

Accounting for Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity during the three year period ended December 31, 2015:

Options	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2012		2,129,929		$	8.82
Granted		510,000			19.64
Exercised		(672,753	)		7.21
Forfeited		(24,000	)		11.27
Outstanding at December 31, 2013		1,943,176		$	12.19		5.31	$	28,379
Granted		605,000			30.15
Exercised		(731,142	)		9.84
Forfeited		(142,500	)		18.94
Outstanding at December 31, 2014		1,674,534		$	19.14		5.10	$	29,886
Granted		524,534			41.97
Exercised		(571,723	)		16.21
Forfeited		(96,500	)		28.47
Outstanding at December 31, 2015		1,530,845		$	27.46		4.97	$	30,573
Exercisable at December 31, 2013		1,055,176		$	12.21		4.58	$	19,314
Exercisable at December 31, 2014		632,034		$	10.13		3.97	$	16,744
Exercisable at December 31, 2015		439,561		$	$12.18		3.51	$	15,480

Fair Value of Option on Date of Grant

	2015	2014	2013
Expected volatility	35%	37%	34%
Weighted average expected volatility	35%	37%	34%
Expected lives	3 yrs.	3 yrs.	3 yrs.
Risk-free interest rate	1.00%	0.60-1.00%	0.57-0.65%
Expected dividend yield	none	none	none

Restricted Stock Activity

The following table summarizes restricted stock activity during the three year period ended December 31, 2015:

Unvested Restricted Shares	Shares			Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2012		162,258		$	13.23
Granted		183,967			18.78
Vested		(102,258	)		13.59
Forfeited		—			—
Outstanding at December 31, 2013		243,967		$	17.43
Granted		104,584			27.79
Vested		(129,092	)		16.45
Forfeited		(42,375	)		19.77
Outstanding at December 31, 2014		177,084		$	23.70
Granted		108,026			44.01
Vested		(82,084	)		23.86
Forfeited		(24,000	)		30.87
Outstanding at December 31, 2015		179,026		$	34.92

SARs Activity

The following table summarizes SARs activity during the three year period ended December 31, 2015:

Stock Appreciation Rights	Units			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2013		495,000		$	19.19
Granted		754,000			34.70
Exercised		(68,750	)		19.10
Forfeited		(120,000	)		21.46
Outstanding at December 31, 2014		1,060,250		$	29.97		6.11	$	9,991
Granted		259,600			43.97
Exercised		(167,500	)		23.90
Forfeited		(102,500	)		27.82
Outstanding at December 31, 2015		1,049,850		$	34.61		5.46	$	13,425
Exercisable at December 31, 2014		35,000		$	19.43		5.53	$	602
Exercisable at December 31, 2015		153,575		$	38.12		5.59	$	1,425

Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Basic and Diluted Shares of Consolidated Condensed Statements of Income

	Year ended December 31,
	2015		2014		2013
Weighted average number of shares for calculation of basic EPS – Common Stock		36,031,792		35,411,608		33,652,646
Stock options under equity incentive plans		443,310		637,723		470,995
Weighted average number of shares for calculation of diluted EPS – Common Stock		36,475,102		36,049,331		34,123,641

Common Stock Issuable upon Exercise of Certain Stock Options

	Year ended December 31,
	2015		2014		2013
Stock options outstanding for equity incentive plans		17,534		155,000		550,000

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Lease Payments


2016	$	6,464
2017		4,250
2018		3,050
2019		2,553
2020		1,952
2021 or later		5,812
Total	$	24,081

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss)

	Automotive		Industrial			Reconciling Items			Consolidated Total
2015:
Product revenues	$	810,567	$	45,878		$	—		$	856,445
Depreciation and amortization		27,251		1,726			2,052			31,029
Operating income (loss)		170,358		(2,461	)		(46,578	)		121,319
2014:
Product revenues	$	787,065	$	24,235		$	—		$	811,300
Depreciation and amortization		30,016		2,114			2,899			35,029
Operating income (loss)		144,645		(9,661	)		(36,550	)		98,434
2013:
Product revenues	$	662,082	$	—		$	—		$	662,082
Depreciation and amortization		28,439		323			2,487			31,249
Operating income (loss)		91,255		(5,860	)		(35,011	)		50,384

Product Revenues Information by Geographic Area

Revenue (based on shipment destination) by geographic area is as follows:

	2015		%			2014		%			2013		%
United States	$	393,206		46	%	$	361,706		45	%	$	292,079		44	%
South Korea		84,758		10	%		89,515		11	%		58,329		9	%
China		76,864		9	%		69,910		9	%		70,671		11	%
Germany		74,003		9	%		90,243		11	%		84,035		13	%
Japan		46,058		5	%		47,528		6	%		39,844		6	%
Mexico		28,274		3	%		19,590		2	%		15,670		2	%
Czech Republic		28,273		3	%		25,738		3	%		17,247		3	%
Canada		27,076		3	%		20,293		2	%		14,254		2	%
United Kingdom		25,952		3	%		24,712		3	%		18,864		3	%
Other		71,981		9	%		62,065		8	%		51,089		7	%
Total Non U.S.		463,239		54	%		449,594		56	%		370,003		56	%
	$	856,445		100	%	$	811,300		100	%	$	662,082		100	%

Percentage of Total Product Revenues Generated from Customers

	2015			2014			2013
Johnson Controls (domestic)		23	%		24	%		27	%
Lear (domestic)		22	%		21	%		18	%
Bosch (foreign)		9	%		9	%		10	%

Pension and Other Post Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Benefit Obligation, Amounts Recognized Company's Financial Statements and Principal Assumptions

	2015			2014
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	2,474		$	1,848
Service cost		379			335
Interest cost		80			78
Actuarial (gain) loss		(35	)		213
Benefit obligation at end of year	$	2,898		$	2,474

Components of Net Periodic Pension Benefit Cost

Components of the Plan’s net periodic pension benefit cost for the years ended December 31, 2015, 2014 and 2013 are as follows:

	2015		2014		2013
Service cost	$	379	$	335	$	355
Interest cost		80		78		53
Amortization of actuarial losses		27		—		37
Net periodic benefit cost	$	486	$	413	$	445

Pretax Amounts Recognized in Other Comprehensive Income

Pretax amounts recognized in other comprehensive income for the years ended December 31, 2015, 2014 and 2013 are as follows


	2015			2014		2013
Actuarial (Gains)/losses	$	(35	)	$	213	$	(193	)
Amortization of actuarial losses		(27	)		—		(37	)
	$	(62	)	$	213	$	(230	)

Fair Value of Plan Assets

The following table sets forth the fair value of the plan assets for the periods ending December 31, 2015 and 2014:

	2015			2014
Change in plan assets:
Plan assets at beginning of year	$	3,615		$	2,340
Actual return on plan assets		126			89
Contributions		257			1,236
Paid pension distributions		(257	)		(278	)
Actuarial gains/(losses)		(28	)		531
Exchange rate impact		(380	)		(303	)
Plan assets at end of year	$	3,333		$	3,615

Actuarial Assumptions Used to Determine Benefit Obligation and Net Periodic Service Cost

	2015			2014
Discount rate		2.21	%		1.95	%
Expected long term rate of return on plan assets		3.70	%		3.80	%

Schedule of Expected Pension Payments

The schedule of expected pension payments made to Gentherm GmbH defined benefit plan participants over the next 10 years is as follows:

Year
2016	$	254
2017		253
2018		253
2019		251
2020		249
2021 - 2025		1,237
Total	$	2,497

Gentherm GmbH

Defined Benefit Plan Disclosure [Line Items]

Benefit Obligation, Amounts Recognized Company's Financial Statements and Principal Assumptions

	2015			2014
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	8,120		$	6,019
Service cost		—			304
Interest cost		142			181
Paid pension distributions		(257	)		(278	)
Actuarial (gains)/losses		(182	)		1,385
Past service cost		—			1,271
Exchange rate impact		(843	)		(762	)
Benefit obligation at end of year	$	6,980		$	8,120

Components of Net Periodic Pension Benefit Cost

Components of the Plan’s net periodic pension benefit cost for the years ended December 31, 2015, 2014 and 2013 are as follows:

	2015			2014			2013
Service cost	$	—			304			—
Interest cost		142			181			180
Return on plan assets		(126	)		(89	)		(59	)
Amortization of prior service cost		572			—			—
Amortization of actuarial loss (gains)		59			(166	)		(37	)
Net periodic benefit cost	$	647			230			84

Pretax Amounts Recognized in Other Comprehensive Income

Pretax amounts recognized in other comprehensive income for the years ended December 31, 2015, 2014 and 2013 are as follows:


	2015			2014		2013
Actuarial (gains)/losses	$	(154	)	$	1,916	$	67
Amortization of actuarial losses		(59	)		166		37
Amortization of prior service cost		(572	)		—		—
	$	(785	)	$	2,082	$	104

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Information related to the recurring fair value measurement of derivative financial instruments in our consolidated balance sheet as of December 31, 2015 is as follows :

Asset Derivatives

Liability Derivatives

Net Asset/
(Liabilities)

Hedge

Designation

Fair Value

Hierarchy

Balance Sheet
Location

Fair
Value

Balance Sheet
Location

Fair
Value

Commodity derivatives

Cash flow hedge

Level 2

Current liabilities

(725

)

(725

)

Information related to the recurring fair value measurement of derivative financial instruments in our consolidated balance sheet as of December 31, 2014 is as follows:

			Asset Derivatives				Liability Derivatives				Net Asset/ (Liabilities)
	Hedge Designation	Fair Value Hierarchy	Balance Sheet Location		Fair Value		Balance Sheet Location	Fair Value			Net Asset/ (Liabilities)
CRS	Not a hedge	Level 2					Current liabilities	$	(2,466	)
							Non current liabilities		(6,698	)
Total CRS								$	(9,164	)	$	(9,164	)
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	145
				Non‑current assets	$	1,345
Total foreign currency derivatives						1,490					$	1,490

Note 13 — Derivative Financial Instruments (Continued)

Information related to the effect of derivative instrument`s on our consolidated statements of income is as follows:


	Location	Year Ended December 31, 2015			Year Ended December 31, 2014
Foreign currency derivatives	Revaluation of derivatives	$	(1,102	)		640
	Product Revenues		—			(390	)
	Cost of Sales		(1,782	)		(174	)
	Selling, general and administrative		(477	)		(161	)
	Other Comprehensive Income		10			(10	)
	Foreign currency gain (loss)		351			(976	)
Total foreign currency derivatives		$	(3,000	)	$	(1,071	)
CRS	Revaluation of derivatives	$	—		$	(1,157	)
	Gain on settlement of derivatives		9,949			—	)
Total CRS		$	9,949		$	(1,157	)
Interest Rate derivatives	Revaluation of derivatives	$	—		$	(1	)
	Other Comprehensive Income		—			81
Total interest rate derivatives		$	—		$	80
Commodity derivatives	Other Comprehensive Income	$	(725	)	$	—
	Cost of Sales		(123	)		—
Total commodity derivatives		$	(848	)	$	—

Gentherm Global Power Technologies (Tables)

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Summary of Purchase Price Allocation

The final purchase price allocation is as follows:


Accounts receivable	$	10,200
Inventory		6,487
Deferred income tax assets, net		3,499
Order backlog		815
Prepaid expenses and other assets		258
Property and equipment		716
Customer relationships		5,524
Technology		2,807
Trade name		725
Goodwill		6,365
Assumed liabilities		(6,530	)
Net assets acquired		30,866
Cash acquired		2,954
Purchase price	$	33,820

Supplemental Pro Forma Information

	Year Ended December 31,
	2014		2013
Product revenues	$	824,311	$	694,697
Net income		71,997		35,348

Roll Forward of Goodwill from Acquisition

	December 31, 2014
	Gross Value		Accumulated Amortization			Net Value		Useful Life
Customer relationships	$	5,264	$	(334	)	$	4,930	12 yrs
Order backlog		777		(777	)		—	0.5 yrs
Technology		2,675		(204	)		2,471	10 yrs
Trade name		690		(150	)		540	3.5 yrs
Total	$	9,406	$	(1,465	)	$	7,941

Summary of Amortization Expense

Amortization expense of $1,962 for the year ended December 31, 2014 was recorded as follows:

	Year Ended December 31, 2014
Product revenues	$	(350	)
Selling, general and administrative expense		1,612

Estimate of Total Intangible Asset Amortization

Amortization expense for the prospective five years is estimated to be as follows:

2015	$	903
2016		903
2017		854
2018		706
2019		706

Summary of Property and Equipment

Property and equipment consist of the following:

Asset Category	Useful Life	Amount
Land	Indefinite	$	15
Buildings	20 yrs		81
Leasehold improvements	5-7 yrs		28
Machinery and equipment	2-5 yrs		423
Computer hardware and software	3-5 yrs		169
		$	716

The Company - Additional Information (Detail)	12 Months Ended
The Company - Additional Information (Detail)	Dec. 31, 2015 Segment
Disclosure Company Additional Information [Abstract]
Number of reportable segments	2
Number of operating segments	3

Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Line Items]
Cash and cash equivalents		$ 144,479	$ 85,700	$ 54,885	$ 58,152
Depreciation expense		16,360	14,930	14,810
Loss from write-off of intangible assets		358
Share based compensation expense		12,316	8,601	3,103
Related deferred tax benefit		3,129	2,006
Additional one-time income tax payment		33,545	24,102	11,097
Scenario forecast
Accounting Policies [Line Items]
Expects to pay withholding tax in Canada one-time tax expense	$ 6,000
Additional one-time income tax payment	$ 30,000
Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans
Accounting Policies [Line Items]
Share based compensation expense		12,316	8,601	3,103
Related deferred tax benefit		3,787	2,949	419
Production tooling
Accounting Policies [Line Items]
Reimbursable tooling capitalized within prepaid expenses and other current assets		$ 5,174	3,990
Minimum
Accounting Policies [Line Items]
Payment terms of contracts		30 days
Minimum \| Production tooling
Accounting Policies [Line Items]
Property plant and equipment, estimated useful life		2 years
Maximum
Accounting Policies [Line Items]
Payment terms of contracts		120 days
Maximum \| Production tooling
Accounting Policies [Line Items]
Property plant and equipment, estimated useful life		5 years
Patents
Accounting Policies [Line Items]
Amortization of intangibles		$ 12,751	$ 16,941	$ 17,570
Loss from write-off of intangible assets		$ 317
Concentration of Credit Risk \| Accounts receivable \| Lear Corporation
Accounting Policies [Line Items]
Percentage of accounts receivable balance		28.00%	27.00%
Concentration of Credit Risk \| Accounts receivable \| Johnson Controls Inc.
Accounting Policies [Line Items]
Percentage of accounts receivable balance		27.00%	27.00%
Concentration of Credit Risk \| Accounts receivable \| Faurecia
Accounting Policies [Line Items]
Percentage of accounts receivable balance		5.00%
Concentration of Credit Risk \| Accounts receivable \| Magna International Inc.
Accounting Policies [Line Items]
Percentage of accounts receivable balance			5.00%
Foreign Jurisdictions
Accounting Policies [Line Items]
Cash and cash equivalents		$ 140,088	$ 81,488

Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Balance at beginning of year	$ 5,221	$ 10,308
Warranty claims paid or retired	(1,654)	(1,102)
Reversal of previously recorded liability		(3,744)
Expense	1,339	555
Adjustment due to currency translation	(348)	(796)
Balance at end of year	$ 4,558	$ 5,221

Reconciliation of Changes in Inventory Reserve (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4,802	$ 2,933	$ 2,185
Expense	815	2,204	779
Inventory write off	(1,060)	(154)	(6)
Adjustment due to currency translation	(249)	(181)
Balance at end of year	$ 4,308	$ 4,802	$ 2,933

Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2015
Buildings and building improvements \| Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years
Buildings and building improvements \| Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	50 years
Plant and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Plant and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	20 years
Production tooling \| Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Production tooling \| Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years
Leasehold improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	Term of lease
Computer equipment and software \| Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Computer equipment and software \| Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years
Capital Leases
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	Term of lease

Roll Forward of Goodwill from Acquisition (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Goodwill	$ 30,398	$ 25,809
Goodwill arising from the acquisition of GPT	107	6,258
Exchange rate impact	(2,740)	(1,669)
Goodwill	$ 27,765	$ 30,398

Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2015
Customer relationships \| Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years
Customer relationships \| Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years
Order Backlog
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	6 months
Technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	8 years
Technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years
Product Development Costs
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	4 years

Estimate of Total Intangible Asset Amortization (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Amortization Expense [Line Items]
2016	$ 903
2017	854
2018	706
2019	706
Patents
Amortization Expense [Line Items]
2016	11,569
2017	10,893
2018	8,356
2019	8,336
2020	8,336
Thereafter	$ 971

Details of Certain Financial Statement Components (Detail) - USD ($)
$ in Thousands

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Inventory:

Raw materials, net of reserve

$ 50,371

$ 48,678

Work in process, net of reserve

4,150

4,009

Finished goods, net of reserve

29,662

24,956

Total inventory

84,183

77,643

Property and equipment:

Buildings, plant and equipment

103,841

76,239

Automobiles

502

499

Production tooling

11,702

11,256

Leasehold improvements

7,546

7,331

Computer equipment and software

17,371

15,560

Construction in progress

12,302

8,063

Total property, plant and equipment, gross

153,264

118,948

Less: Accumulated depreciation

^[1]

(34,107)

(27,221)

Total property, plant and equipment, net

119,157

91,727

Other intangible assets:

Other intangible assets

108,055

121,885

Accumulated amortization

(59,594)

(53,756)

Total other intangible assets Net

48,461

68,129

Accrued liabilities:

Tax accruals

18,205

15,696

Accrued warranty

4,558

5,221

$ 10,308

Accrued employee liabilities

19,481

19,783

Liabilities from discounts and rebates

8,348

8,429

Other accrued liabilities

10,231

19,258

Total accrued liabilities

60,823

68,387

Customer relationships

Other intangible assets:

Other intangible assets

68,296

77,026

Technology

Other intangible assets:

Other intangible assets

29,473

32,467

Product Development

Other intangible assets:

Other intangible assets

$ 10,286

$ 12,392

[1]	Includes accumulated amortization of capital lease obligations.

Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Derivative financial instruments	$ 267	$ 2,461
Net operating losses	5,525	7,075
Research and development credits	21,494	26,204
Depreciation	3,886	3,456
Valuation reserves and accrued liabilities	5,553	4,788
Foreign tax credit	1,654	823
Stock compensation	3,129	2,006
Inventory	1,622	1,443
Patents	156	138
Defined benefit obligation	2,011	1,479
Other credits	639	593
Other	10	144
Deferred tax assets, gross	45,946	50,610
Valuation allowance	(13,418)	(18,037)
Deferred tax liabilities:
Intangible assets	(10,161)	(14,593)
Unrealized foreign currency exchange gains	(3,797)	(2,855)
Undistributed profits of subsidiary	(3,254)	(293)
Property and equipment	(696)	(162)
Other	(342)	(384)
Deferred tax liabilities, gross	(18,250)	(18,287)
Net deferred tax asset (liability)	$ 14,278	$ 14,286

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Statutory Federal income tax rate	34.00%	34.00%	34.00%
Tax benefit related to stock compensation tax deductions	$ 6,681	$ 1,831	$ 2,074
Stock option exercises included in net operating loss carryforwards	5,525	7,075
Total unrecognized tax benefits	$ 4,443	$ 4,651	$ 2,241	$ 2,191
Macedonia
Income Taxes [Line Items]
Income tax holiday, expiration period	expire no later than 2025
Preferred Financing
Income Taxes [Line Items]
Net operating loss carryforward annual limitation	$ 591
Net operating loss carryforward expected to expire	6,025
Net operating loss expired	13,324
U.S. Federal
Income Taxes [Line Items]
Stock option exercises included in net operating loss carryforwards	$ 22,343

Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	34.00%	34.00%	34.00%
Increase (Decrease) resulting from:
U.S. Taxes on foreign income, net of taxes paid credit	1.00%	0.30%	(1.70%)
Change in valuation allowance	(1.90%)	(0.80%)
Foreign, state and local tax, net of Federal benefit	1.60%	1.90%	3.60%
Nondeductible expenses	1.80%	1.80%	1.40%
Stock option compensation	(0.10%)	(0.10%)	(0.50%)
Research and development credits	(0.90%)	(0.50%)	(2.30%)
Effect of different tax rates of foreign jurisdictions	(12.10%)	(10.00%)	(10.80%)
Undistributed profits of subsidiaries	2.40%
Other tax exempt income	(0.10%)	(0.90%)
Other	0.30%	(0.10%)	0.30%
Effective rate	26.00%	25.60%	24.00%

Net Operating Loss Carryforwards (Detail) $ in Thousands	12 Months Ended
Net Operating Loss Carryforwards (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
U.S. Federal and state income tax
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 47,869
U.S. Federal and state income tax \| Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2018
U.S. Federal and state income tax \| Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2034
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 5,719
Foreign \| Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2018
Foreign \| Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2020
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 5,000
Operating loss carryforward, year of expiration	Indefinite

Earnings Before Income Taxes and Tax Provisions - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income before income taxes:
Domestic	$ 25,508	$ 11,170	$ 6,891
Foreign	103,430	83,051	39,339
Earnings before income tax	$ 128,938	$ 94,221	$ 46,230

Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax expense:
Federal	$ 8,428	$ 4,005	$ 690
State and local	606	(15)	495
Foreign	24,622	24,737	9,959
Total current income tax expense	33,656	28,727	11,144
Deferred income tax expense (benefit):
Federal	(3,051)	(576)	12
State and local	(183)	9	(95)
Foreign	3,123	(4,058)	36
Total deferred income tax expense	(111)	(4,625)	(47)
Total tax expense	$ 33,545	$ 24,102	$ 11,097

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 4,651	$ 2,241	$ 2,191
Additions based on tax position related to current year		43	2
Additions based on tax positions related to prior year	262	2,991	580
Reductions from settlements and statute of limitation expiration	(19)	(432)	(599)
Effect of foreign currency translation	(451)	(192)	67
Balance at end of year	$ 4,443	$ 4,651	$ 2,241

Debt - Additional Information (Detail)	12 Months Ended
Debt - Additional Information (Detail)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)
Debt Instrument [Line Items]
Maximum percentage of stock of non US subsidiaries pledge to secure obligation	66.00%	66.00%
Federal Funds Rate \| Minimum
Debt Instrument [Line Items]
Interest rate	0.20%
Federal Funds Rate \| Maximum
Debt Instrument [Line Items]
Interest rate	0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Secured long-term debt	$ 100,000,000
Line of credit facility	50,000,000
Amounts available under credit agreement	86,100,000
U.S. Term Note
Debt Instrument [Line Items]
Loan borrowing capacity	50,000,000
Amounts available under credit agreement	$ 0
Europe Term Loan
Debt Instrument [Line Items]
Loan borrowing capacity \| €		€ 20,000,000
Amounts available under credit agreement \| €		€ 0
United State Bank Of America Credit Facility
Debt Instrument [Line Items]
Interest rate	3.50%
Euro Currency Rate Loans
Debt Instrument [Line Items]
Interest rate	1.00%
Euro Currency Rate Loans \| Minimum
Debt Instrument [Line Items]
Interest rate	1.50%
Euro Currency Rate Loans \| Maximum
Debt Instrument [Line Items]
Interest rate	2.00%
Base Rate Loans \| Minimum
Debt Instrument [Line Items]
Interest rate	0.50%
Base Rate Loans \| Maximum
Debt Instrument [Line Items]
Interest rate	1.00%
DEG Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date	2015-03
Semi-annual principal payments latest date	2019-09
DEG Vietnam Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date	2017-11
Semi-annual principal payments latest date	2023-05

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 97,741	$ 90,775
Current portion	(4,909)	(5,306)
Long-term debt, less current maturities	$ 92,832	$ 85,469
U.S. Term Note
Debt Instrument [Line Items]
Interest Rate	2.11%	2.00%
Total debt	$ 46,875	$ 49,375
Europe Term Loan
Debt Instrument [Line Items]
Interest Rate	1.50%	1.81%
Total debt	$ 20,369	$ 23,963
U.S. Revolving Note
Debt Instrument [Line Items]
Interest Rate	1.92%	1.92%
Total debt	$ 12,000	$ 12,000
DEG China Loan
Debt Instrument [Line Items]
Interest Rate	4.25%	4.25%
Total debt	$ 3,497	$ 4,805
DEG Vietnam Loan
Debt Instrument [Line Items]
Interest Rate	5.21%
Total debt	$ 15,000
Capital Lease
Debt Instrument [Line Items]
Interest Rate		4.20%
Total debt		$ 632

Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt maturing in 2016	$ 4,909
Debt maturing in 2017	7,504
Debt maturing in 2018	9,201
Debt maturing in 2019	67,377
Debt maturing in 2020	2,500
Thereafter	6,250
Total debt	97,741	$ 90,775
U.S. Term Note
Debt Instrument [Line Items]
Debt maturing in 2016	2,813
Debt maturing in 2017	3,750
Debt maturing in 2018	4,062
Debt maturing in 2019	36,250
Total debt	46,875	49,375
Europe Term Loan
Debt Instrument [Line Items]
Debt maturing in 2016	1,222
Debt maturing in 2017	1,630
Debt maturing in 2018	1,765
Debt maturing in 2019	15,752
Total debt	20,369	23,963
U.S. Revolving Note
Debt Instrument [Line Items]
Debt maturing in 2019	12,000
Total debt	12,000	12,000
DEG China Loan
Debt Instrument [Line Items]
Debt maturing in 2016	874
Debt maturing in 2017	874
Debt maturing in 2018	874
Debt maturing in 2019	875
Total debt	3,497	$ 4,805
DEG Vietnam Loan
Debt Instrument [Line Items]
Debt maturing in 2017	1,250
Debt maturing in 2018	2,500
Debt maturing in 2019	2,500
Debt maturing in 2020	2,500
Thereafter	6,250
Total debt	$ 15,000

Accounting for Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May 16, 2013	May 15, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option grant expiration period			10 years
Unrecognized compensation cost related to nonvested options and restricted options	$ 20,117	$ 16,590
Unrecognized share-based compensation cost recognition period	2 years
Share based compensation expense	$ 12,316	$ 8,601	$ 3,103
Weighted average grant date fair value of options granted	$ 10.60	$ 7.88	$ 4.71
Total intrinsic value of options exercised	$ 18,745	$ 21,249	$ 8,301
Total fair value of shares vested	$ 4,088	5,329	2,076
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of performance based unvested SARs outstanding	49,800
Total intrinsic value of options exercised	$ 4,185	$ 2,072	$ 0
Employee and Consultants \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	3 years
Employee and Consultants \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	5 years
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	1 year
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	1,676,586
Number of shares authorized for grant				3,500,000
Equity Incentive Plan Twenty Eleven And Two Thousand And Six
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant				0	2,315,578

Summarizes Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options Outstanding, beginning balance, Shares	1,674,534	1,943,176	2,129,929
Granted, Shares	524,534	605,000	510,000
Exercised, Shares	(571,723)	(731,142)	(672,753)
Forfeited, Shares	(96,500)	(142,500)	(24,000)
Stock Options Outstanding, ending balance, Shares	1,530,845	1,674,534	1,943,176
Stock Options Exercisable, Shares	439,561	632,034	1,055,176
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 19.14	$ 12.19	$ 8.82
Granted, Weighted-Average Exercise Price	41.97	30.15	19.64
Exercised, Weighted-Average Exercise Price	16.21	9.84	7.21
Forfeited, Weighted-Average Exercise Price	28.47	18.94	11.27
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	27.46	19.14	12.19
Exercisable, Weighted-Average Exercise Price	$ 12.18	$ 10.13	$ 12.21
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	4 years 11 months 19 days	5 years 1 month 6 days	5 years 3 months 22 days
Exercisable, Weighted-Average Remaining Contractual Term	3 years 6 months 4 days	3 years 11 months 19 days	4 years 6 months 29 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 30,573	$ 29,886	$ 28,379
Exercisable, Aggregate Intrinsic Value	$ 15,480	$ 16,744	$ 19,314

Fair Value of Option on date of grant (Detail)	12 Months Ended
Fair Value of Option on date of grant (Detail)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Stockholders Equity [Abstract]
Expected volatility	35.00%	37.00%	34.00%
Weighted average expected volatility	35.00%	37.00%	34.00%
Expected lives	3 years	3 years	3 years
Risk-free interest rate		0.60%	0.57%
Risk-free interest rate		1.00%	0.65%
Risk-free interest rate	1.00%
Expected dividend yield

Summarizes Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Nonvested at beginning of period, Shares	177,084	243,967	162,258
Granted, Shares	108,026	104,584	183,967
Vested, Shares	(82,084)	(129,092)	(102,258)
Forfeited, Shares	(24,000)	(42,375)
Nonvested at end of period, Shares	179,026	177,084	243,967
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value	$ 23.70	$ 17.43	$ 13.23
Granted, Weighted-Average Grant Date Fair Value	44.01	27.79	18.78
Vested, Weighted-Average Grant Date Fair Value	23.86	16.45	13.59
Forfeited, Weighted-Average Grant Date Fair Value	30.87	19.77
Nonvested at end of period, Weighted-Average Grant Date Fair Value	$ 34.92	$ 23.70	$ 17.43

Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	1,674,534	1,943,176	2,129,929
Granted, Shares	524,534	605,000	510,000
Exercised, Shares	(571,723)	(731,142)	(672,753)
Forfeited, Shares	(96,500)	(142,500)	(24,000)
Stock Options Outstanding, ending balance, Shares	1,530,845	1,674,534	1,943,176
Exercisable, Ending Balance	439,561	632,034	1,055,176
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 19.14	$ 12.19	$ 8.82
Granted, Weighted-Average Exercise Price	41.97	30.15	19.64
Exercised, Weighted-Average Exercise Price	16.21	9.84	7.21
Forfeited, Weighted-Average Exercise Price	28.47	18.94	11.27
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	27.46	19.14	12.19
Exercisable, Weighted Average Exercise Price	$ 12.18	$ 10.13	$ 12.21
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	4 years 11 months 19 days	5 years 1 month 6 days	5 years 3 months 22 days
Exercisable, Weighted-Average Remaining Contractual Term	3 years 6 months 4 days	3 years 11 months 19 days	4 years 6 months 29 days
Outstanding, Aggregate Intrinsic Value	$ 30,573	$ 29,886	$ 28,379
Exercisable, Aggregate Intrinsic Value	$ 15,480	$ 16,744	$ 19,314
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	1,060,250	495,000
Granted, Shares	259,600	754,000
Exercised, Shares	(167,500)	(68,750)
Forfeited, Shares	(102,500)	(120,000)
Stock Options Outstanding, ending balance, Shares	1,049,850	1,060,250	495,000
Exercisable, Ending Balance	153,575	35,000
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 29.97	$ 19.19
Granted, Weighted-Average Exercise Price	43.97	34.70
Exercised, Weighted-Average Exercise Price	23.90	19.10
Forfeited, Weighted-Average Exercise Price	27.82	21.46
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	34.61	29.97	$ 19.19
Exercisable, Weighted Average Exercise Price	$ 38.12	$ 19.43
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	5 years 5 months 16 days	6 years 1 month 10 days
Exercisable, Weighted-Average Remaining Contractual Term	5 years 7 months 2 days	5 years 6 months 11 days
Outstanding, Aggregate Intrinsic Value	$ 13,425	$ 9,991
Exercisable, Aggregate Intrinsic Value	$ 1,425	$ 602

Earnings per Share (Detail) - shares	12 Months Ended
Earnings per Share (Detail) - shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	36,031,792	35,411,608	33,652,646
Stock options under equity incentive plans	443,310	637,723	470,995
Weighted average number of shares for calculation of diluted EPS – Common Stock	36,475,102	36,049,331	34,123,641
Stock options outstanding for equity incentive plans
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation	17,534	155,000	550,000

Future Minimum Lease Payments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2016	$ 6,464
2017	4,250
2018	3,050
2019	2,553
2020	1,952
2021 or later	5,812
Total	$ 24,081

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Rent expense under company's operating leases	$ 6,660	$ 6,331	$ 5,992

Shareholder Rights Plan - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of shares of preferred stock authorized \| shares	4,991,000
Stockholder rights plan expiration date	2019-01
Exercise price of preferred stock purchase right \| $ / shares	$ 20.00
Percentage of Common Stock ownership to make rights exercisable	15.00%
Series B Preferred Stock
Class Of Warrant Or Right [Line Items]
Preferred shares entitled to be purchased per right	0.001

Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Goodwill	$ 27,765	$ 30,398	$ 25,809
Reimbursed research and development costs	9,607	8,885	2,324
Selling, general and administrative costs	$ 95,456	84,647	72,091
Acquisition transaction expenses		1,075	2,414
Number of customers \| Customer	3
United States
Segment Reporting Information [Line Items]
Number of customers \| Customer	2
Foreign
Segment Reporting Information [Line Items]
Number of customers \| Customer	1
Automotive Segments
Segment Reporting Information [Line Items]
Goodwill	$ 21,614	24,140
Industrial Segments
Segment Reporting Information [Line Items]
Goodwill	6,151	6,258
Reimbursed research and development costs	9,607	8,885	2,324
Selling, general and administrative costs	$ 46,578	36,214	32,597
Acquisition transaction expenses		$ 1,075	$ 2,414

Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Product revenues	$ 856,445	$ 811,300	$ 662,082
Depreciation and amortization	31,029	35,029	31,249
Operating income (loss)	121,319	98,434	50,384
Operating Segments \| Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	810,567	787,065	662,082
Depreciation and amortization	27,251	30,016	28,439
Operating income (loss)	170,358	144,645	91,255
Operating Segments \| Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	45,878	24,235
Depreciation and amortization	1,726	2,114	323
Operating income (loss)	(2,461)	(9,661)	(5,860)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	2,052	2,899	2,487
Operating income (loss)	$ (46,578)	$ (36,550)	$ (35,011)

Segment Reporting (Detail) - USD ($) $ in Thousands	12 Months Ended
Segment Reporting (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Product revenues	$ 856,445	$ 811,300	$ 662,082
Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Product revenues	$ 393,206	$ 361,706	$ 292,079
United States \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	46.00%	45.00%	44.00%
South Korea
Segment Reporting Information [Line Items]
Product revenues	$ 84,758	$ 89,515	$ 58,329
South Korea \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	10.00%	11.00%	9.00%
China
Segment Reporting Information [Line Items]
Product revenues	$ 76,864	$ 69,910	$ 70,671
China \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	9.00%	11.00%
Germany
Segment Reporting Information [Line Items]
Product revenues	$ 74,003	$ 90,243	$ 84,035
Germany \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	11.00%	13.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 46,058	$ 47,528	$ 39,844
Japan \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	6.00%	6.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	$ 28,274	$ 19,590	$ 15,670
Mexico \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	2.00%	2.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 28,273	$ 25,738	$ 17,247
Czech Republic \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	3.00%	3.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 27,076	$ 20,293	$ 14,254
Canada \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	2.00%	2.00%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	$ 25,952	$ 24,712	$ 18,864
United Kingdom \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	3.00%	3.00%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 71,981	$ 62,065	$ 51,089
Other \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	8.00%	7.00%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 463,239	$ 449,594	$ 370,003
Non U.S. \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	54.00%	56.00%	56.00%

Percentage of Total Product Revenues Generated from Customers (Detail) - Sales Revenue, Net - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Johnson Controls Inc.
Segment Reporting Information [Line Items]
Total product revenues in percentage	23.00%	24.00%	27.00%
Lear Corporation
Segment Reporting Information [Line Items]
Total product revenues in percentage	22.00%	21.00%	18.00%
Bosch
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	9.00%	10.00%

Pension and Other Post Retirement Benefit Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Payment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Vesting period	6 years
Discount rate for net periodic service cost	3.25%	4.25%	3.25%
Discount rate for benefit obligation	3.40%	3.25%	4.25%
Insurance policy value	$ 1,993,000	$ 2,056,000
Tax (expense) benefit recognized in other comprehensive income	(23,000)	121,000	$ 0
Pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss)	266,000	328,000
Expected pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss ) in next fiscal year	0
Contributions to 401(k) plan	$ 959,000	$ 543,000	191,000
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	2.21%	1.95%
Tax (expense) benefit recognized in other comprehensive income	$ (211,000)	$ 559,000	$ 18,000
Pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss)	1,821,000	2,267,000
Expected pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss ) in next fiscal year	47,000
Pension benefit obligation	3,647,000
Underfunded defined benefit plan	3,647,000	4,505,000
Defined benefit plan, expected employer contribution in next fiscal year	257,000
Gentherm GmbH \| Accrued Liabilities
Defined Benefit Plan Disclosure [Line Items]
Portion of the net benefit obligation payable	0	$ 274,000
Chief Executive Officer
Defined Benefit Plan Disclosure [Line Items]
Annual retirement payment	$ 300,000,000
Number of expected annual retirement benefit payments \| Payment	15
Annual retirement benefit payments, earliest date	Jan. 01, 2018

Benefit Obligation, Amounts Recognized Company's Financial Statements and Principal Assumptions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$ 2,474	$ 1,848
Service cost	379	335	$ 355
Interest cost	80	78	53
Actuarial (gain) loss	(35)	213
Benefit obligation at end of year	2,898	2,474	1,848
Gentherm GmbH
Change in projected benefit obligation:
Benefit obligation at beginning of year	8,120	6,019
Service cost		304
Interest cost	142	181	180
Paid pension distributions	(257)	(278)
Actuarial (gain) loss	(182)	1,385
Past service cost		1,271
Exchange rate impact	(843)	(762)
Benefit obligation at end of year	$ 6,980	$ 8,120	$ 6,019

Components of Net Periodic Pension Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 379	$ 335	$ 355
Interest cost	80	78	53
Amortization of actuarial loss (gains)	27		37
Net periodic benefit cost	486	413	445
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Service cost		304
Interest cost	142	181	180
Return on plan assets	(126)	(89)	(59)
Amortization of prior service cost	572
Amortization of actuarial loss (gains)	59	(166)	(37)
Net periodic benefit cost	$ 647	$ 230	$ 84

Pretax Amounts Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Actuarial (Gains)/losses	$ (35)	$ 213	$ (193)
Amortization of actuarial losses	(27)		(37)
Pretax amounts recognized in other comprehensive income (loss)	(62)	213	(230)
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Actuarial (Gains)/losses	(154)	1,916	67
Amortization of actuarial losses	(59)	166	37
Amortization of prior service cost	(572)
Pretax amounts recognized in other comprehensive income (loss)	$ (785)	$ 2,082	$ 104

Fair Value of Plan Assets (Detail) - Gentherm GmbH - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Change in plan assets:
Plan assets at beginning of year	$ 3,615	$ 2,340
Actual return on plan assets	126	89
Contributions	257	1,236
Paid pension distributions	(257)	(278)
Actuarial gains/(losses)	(28)	531
Exchange rate impact	(380)	(303)
Plan assets at end of year	$ 3,333	$ 3,615

Actuarial Assumptions Used to Determine Benefit Obligation and Net Periodic Service Cost (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.40%	3.25%	4.25%
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.21%	1.95%
Expected long term rate of return on plan assets	3.70%	3.80%

Schedule of Expected Pension Payments (Detail) - Gentherm GmbH $ in Thousands	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2016	$ 254
2017	253
2018	253
2019	251
2020	249
2021 - 2025	1,237
Total	$ 2,497

Fair Value Measurement - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	$ 0	$ 0
Financial liabilities, fair value	0	0
Carrying value	97,741,000	90,775,000
DEG Vietnam Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	15,000,000
Fair value	15,056,000
DEG China Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	3,497,000	4,805,000
Fair value	$ 3,588,000	$ 4,937,000

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2008	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Maximum length of time to hedge exposure to foreign currency exchange risk			1 year
Maximum length of time to hedge exposure to price fluctuations in material commodities			2 years
Revaluation of derivatives (loss) gain			$ (1,102,000)	$ (518,000)	$ 1,006,000
One-time pre-tax gain			(3,000,000)	(1,071,000)
Final cash settlement payment			7,593,000
Foreign Currency Derivatives
Derivative [Line Items]
Notional Value		$ 0	0	52,446,000
Commodity Derivatives
Derivative [Line Items]
Notional Value		4,885,000	4,885,000	0
Revaluation of derivatives (loss) gain			0
One-time pre-tax gain			(848,000)
Interest Rate Swap
Derivative [Line Items]
One-time pre-tax gain				80,000
Hedge Ineffectiveness Incurred			0	0
Interest Rate Swap \| Automotive Segments
Derivative [Line Items]
Derivative maturity period	10 years
Currency Related Swap
Derivative [Line Items]
One-time pre-tax gain		9,949,000	$ 9,949,000	$ (1,157,000)
Final cash settlement payment		$ 7,593,000

Information Related to Recurring Fair Value Measurement of Derivative Financial Instruments in Our Consolidated Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commodity Derivatives \| Cash Flow Hedge \| Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value	$ (725)
Net Asset/(Liabilities)	$ (725)
Currency Related Swap \| Not a Hedge
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		$ (9,164)
Net Asset/(Liabilities)		(9,164)
Currency Related Swap \| Not a Hedge \| Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		(2,466)
Currency Related Swap \| Not a Hedge \| Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair value		(6,698)
Foreign Currency Derivatives \| Not a Hedge
Derivatives Fair Value [Line Items]
Net Asset/(Liabilities)		1,490
Asset Derivatives, Fair Value		1,490
Foreign Currency Derivatives \| Not a Hedge \| Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		145
Foreign Currency Derivatives \| Not a Hedge \| Noncurrent Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		$ 1,345

Information Related to Effect of Derivative Instrument's on Our Consolidated Statements of Income (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		$ (3,000,000)	$ (1,071,000)
Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 9,949,000	9,949,000	(1,157,000)
Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			80,000
Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(848,000)
Other Comprehensive Income (Loss) \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		10,000	(10,000)
Other Comprehensive Income (Loss) \| Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			81,000
Other Comprehensive Income (Loss) \| Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(725,000)
Revaluation of Derivatives \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(1,102,000)	640,000
Revaluation of Derivatives \| Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			(1,157,000)
Revaluation of Derivatives \| Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			(1,000)
Product Revenues \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives			(390,000)
Cost of Sales \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(1,782,000)	(174,000)
Cost of Sales \| Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(123,000)
Selling, General and Administrative Expense \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(477,000)	(161,000)
Foreign Currency (Loss) Gain \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		351,000	$ (976,000)
Gain on Settlement of Derivatives \| Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		$ 9,949,000

Gentherm Global Power Technologies - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2014	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 30,398	$ 27,765	$ 25,809
Global Thermoelectric Inc
Business Acquisition [Line Items]
Product revenues		24,235
Operating Income		776
Net assets acquired	$ 30,866
Cash acquired on acquisition	2,954
Goodwill	6,365
Intangible assets before foreign currency adjustment	$ 9,871
Decrease in intangible assets, net of accumulated amortization, fluctuations in foreign currency exchange rates		465
Amortization of intangibles		$ 1,962

Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 27,765	$ 30,398	$ 25,809
Purchase price		(107)	$ 31,474
Global Thermoelectric Inc
Business Acquisition [Line Items]
Accounts receivable	$ 10,200
Inventory	6,487
Deferred income tax assets, net	3,499
Prepaid expenses and other assets	258
Property and equipment	716	$ 716
Goodwill	6,365
Assumed liabilities	(6,530)
Net assets acquired	30,866
Cash acquired on acquisition	2,954
Purchase price	33,820
Global Thermoelectric Inc \| Order backlog
Business Acquisition [Line Items]
Intangible assets	815
Global Thermoelectric Inc \| Customer relationships
Business Acquisition [Line Items]
Intangible assets	5,524
Global Thermoelectric Inc \| Technology
Business Acquisition [Line Items]
Intangible assets	2,807
Global Thermoelectric Inc \| Trade Name
Business Acquisition [Line Items]
Intangible assets	$ 725

Supplemental Pro Forma Information (Detail) - Global Thermoelectric Inc - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Product revenues	$ 824,311	$ 694,697
Net income	$ 71,997	$ 35,348

Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 121,885	$ 108,055
Accumulated Amortization	(53,756)	(59,594)
Total other intangible assets Net	68,129	48,461
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	77,026	68,296
Technology
Finite Lived Intangible Assets [Line Items]
Gross Value	32,467	$ 29,473
Global Thermoelectric Inc
Finite Lived Intangible Assets [Line Items]
Gross Value	9,406
Accumulated Amortization	(1,465)
Total other intangible assets Net	7,941
Global Thermoelectric Inc \| Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	5,264
Accumulated Amortization	(334)
Total other intangible assets Net	$ 4,930
Estimated useful life of intangible assets	12 years
Global Thermoelectric Inc \| Order backlog
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 777
Accumulated Amortization	$ (777)
Estimated useful life of intangible assets	6 months
Global Thermoelectric Inc \| Technology
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 2,675
Accumulated Amortization	(204)
Total other intangible assets Net	$ 2,471
Estimated useful life of intangible assets	10 years
Global Thermoelectric Inc \| Trade Name
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 690
Accumulated Amortization	(150)
Total other intangible assets Net	$ 540
Estimated useful life of intangible assets	3 years 6 months

Summary of Amortization Expense (Detail) $ in Thousands	12 Months Ended
Summary of Amortization Expense (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Product Revenues
Business Acquisition [Line Items]
Amortization of intangibles	$ (350)
Selling, General and Administrative Expense
Business Acquisition [Line Items]
Amortization of intangibles	$ 1,612

Summary of Amortization Expense for Prospective Years (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Business Combinations [Abstract]
2015	$ 903
2016	903
2017	854
2018	706
2019	$ 706

Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Apr. 01, 2014
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	Term of lease
Global Thermoelectric Inc
Property Plant And Equipment [Line Items]
Property and equipment	$ 716	$ 716
Global Thermoelectric Inc \| Land
Property Plant And Equipment [Line Items]
Property and equipment	$ 15
Property and equipment, Useful life	Indefinite
Global Thermoelectric Inc \| Buildings
Property Plant And Equipment [Line Items]
Property and equipment	$ 81
Property and equipment, Useful life	20 years
Global Thermoelectric Inc \| Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment	$ 28
Global Thermoelectric Inc \| Leasehold improvements \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	5 years
Global Thermoelectric Inc \| Leasehold improvements \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	7 years
Global Thermoelectric Inc \| Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment	$ 423
Global Thermoelectric Inc \| Machinery and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	2 years
Global Thermoelectric Inc \| Machinery and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	5 years
Global Thermoelectric Inc \| Computer Hardware and Software
Property Plant And Equipment [Line Items]
Property and equipment	$ 169
Global Thermoelectric Inc \| Computer Hardware and Software \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	3 years
Global Thermoelectric Inc \| Computer Hardware and Software \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	5 years

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 2,847	$ 1,807	$ 2,474
Charged to Costs and Expenses	4,174	2,043	1,723
Charged to Other Accounts	(123)	(105)	(8)
Inventory write off	(4,059)	(898)	(2,382)
Balance at end of year	2,839	2,847	1,807
Valuation Allowance of Deferred Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	18,037	2,199	2,199
Charged to Other Accounts	(2,436)	16,674
Inventory write off	(2,183)	(836)
Balance at end of year	13,418	18,037	2,199
Inventory Valuation Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	4,802	2,933	2,185
Charged to Costs and Expenses	815	2,204	779
Charged to Other Accounts	(249)	(181)	(25)
Inventory write off	(1,060)	(154)	(6)
Balance at end of year	$ 4,308	$ 4,802	$ 2,933