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Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
Document and Entity Information - USD ($) $ in Thousands	Dec. 31, 2014	Mar. 02, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
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		35,846,853
Entity Public Float			$ 1,433,250

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash & cash equivalents	$ 85,700	$ 54,885
Accounts receivable, less allowance of $2,847 and $1,807, respectively	136,183	118,283
Inventory	77,643	64,217
Derivative financial instruments	145	67
Deferred income tax assets	6,247	10,616
Prepaid expenses and other assets	29,107	21,864
Total current assets	335,025	269,932
Property and equipment, net	91,727	79,234
Goodwill	30,398	25,809
Other intangible assets, net of accumulated amortization of $53,756 and $44,474, respectively	68,129	83,431
Deferred financing costs	406	1,072
Deferred income tax assets	18,843	7,103
Derivative financial instruments	1,345	1,969
Other non-current assets	12,019	13,373
Total assets	557,892	481,923
Current Liabilities:
Accounts payable	71,434	61,662
Accrued liabilities	68,387	66,783
Current maturities of long-term debt	5,306	21,439
Derivative financial instruments	2,466	2,552
Deferred income tax liabilities		710
Total current liabilities	147,593	153,146
Pension benefit obligation	10,321	6,868
Other Liabilities	2,788	1,601
Long-term debt, less current maturities	85,469	60,881
Derivative financial instruments	6,698	9,358
Deferred tax liabilities	10,804	17,975
Total liabilities	263,673	249,829
Common Stock:
No par value; 55,000,000 shares authorized, 35,696,742 and 34,929,334 issued and outstanding at December 31, 2014 and 2013, respectively	243,255	232,067
Paid-in capital	(8,224)	(9,582)
Accumulated other comprehensive income	(25,743)	(5,203)
Accumulated earnings	84,931	14,812
Total shareholders’ equity	294,219	232,094
Total liabilities and shareholders’ equity	$ 557,892	$ 481,923

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 2,847	$ 1,807
Accumulated amortization	$ 53,756	$ 44,474
Common Stock, par value
Common Stock, shares authorized	55,000,000	55,000,000
Common Stock, shares issued	35,696,742	34,929,334
Common Stock, shares outstanding	35,696,742	34,929,334

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Product revenues	$ 811,300	$ 662,082	$ 554,979
Cost of sales	569,618	487,320	413,052
Gross margin	241,682	174,762	141,927
Operating costs and expenses:
Research and development expenses	66,411	52,197	43,189
Reimbursed research and development expenses	(8,885)	(2,324)	(2,239)
Net research and development expenses	57,526	49,873	40,950
Acquisition transaction expenses	1,075	2,414
Selling, general and administrative expenses	84,647	72,091	64,321
Total operating costs and expenses	143,248	124,378	105,271
Operating income	98,434	50,384	36,656
Interest expense	(3,262)	(3,543)	(4,136)
Debt retirement expense	(1,370)
Revaluation of derivatives (loss) gain	(518)	1,006	(2,292)
Foreign currency (loss) gain	(218)	(2,228)	2,201
Gain (loss) from equity investment	785	436	(82)
Other income	370	175	325
Earnings before income tax	94,221	46,230	32,672
Income tax expense	24,102	11,097	8,351
Net income	70,119	35,133	24,321
Income attributable to non-controlling interest		(1,313)	(6,449)
Net income attributable to Gentherm Incorporated	70,119	33,820	17,872
Convertible preferred stock dividends		(1,622)	(6,711)
Net income attributable to common shareholders	$ 70,119	$ 32,198	$ 11,161
Basic earnings per share	$ 1.98	$ 0.96	$ 0.39
Diluted earnings per share	$ 1.95	$ 0.94	$ 0.39
Weighted average number of shares—basic	35,411,608	33,652,646	28,352,864
Weighted average number of shares—diluted	36,049,331	34,123,641	28,862,463

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 70,119	$ 35,133	$ 24,321
Other comprehensive income (loss), gross of tax:
Net gain (loss) on pension benefit obligation	(2,295)	126	(1,225)
Foreign currency translation adjustments (loss) gain	(25,044)	5,315	4,465
Unrealized loss on foreign currency derivative securities	(10)
Unrealized gain (loss) on interest rate derivative securities	81	143	(18)
Other comprehensive income (loss), gross of tax	(27,268)	5,584	3,222
Other comprehensive income, related tax effects:
Net gain on pension benefit obligation	680	18	193
Foreign currency translation adjustments	6,048	426	108
Other comprehensive income, related tax effect	6,728	444	301
Other comprehensive income (loss), net of tax:	(20,540)	6,028	3,523
Comprehensive income:	49,579	41,161	27,844
Less: comprehensive income (loss) attributable to the non-controlling interest		(271)	7,523
Comprehensive income attributable to Gentherm Incorporated:	$ 49,579	$ 41,432	$ 20,321

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	Currency Hedge Adjustment	Stockholders' Equity, Total	Noncontrolling Interest
Balance at Dec. 31, 2011	$ 104,785	$ 80,502	$ 23,387	$ (28,544)	$ (170)	$ (14,378)		$ (206)	$ 60,591	$ 44,194
Balance (in shares) at Dec. 31, 2011		23,515,000
Public stock offering	75,532	$ 75,532							75,532
Public stock offering (in shares)		5,290,000
Exercise of Common Stock options for cash	$ 774	$ 1,035	(261)						774
Exercise of Common Stock options for cash (in shares)	176,896	177,000
Tax benefit from Exercises of Common Stock options	$ 171		171						171
Common Stock issued to Board of Directors and employees and consultants	429	$ 429							429
Common Stock issued to Board of Directors and employees and consultants (in shares)		155,000
Stock option compensation	823		823						823
Convertible preferred stock dividends	(6,711)			(6,711)					(6,711)
Preferred stock principal paid in common stock	7,780	$ 7,780							7,780
Preferred stock principal paid in common stock (Shares)		601,000
Preferred stock dividend paid in common stock	1,031	$ 1,031							1,031
Preferred stock dividend paid in common stock (Shares)		80,000
Proceeds from subsidiary issuance of equity shares	1,921									1,921
Distribution paid to non-controlling interest	(290)									(290)
Net (loss) gain on pension benefit obligation	(1,032)				(1,032)				(1,032)
Currency translation, net	5,647					4,573			4,573	1,074
Interest rate hedge, net	(18)							(18)	(18)
Net Income	24,321			17,872					17,872	6,449
Balance at Dec. 31, 2012	215,163	$ 166,309	24,120	(17,383)	(1,202)	(9,805)		(224)	161,815	53,348
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 and consultants	1,509	$ 1,509							1,509
Common Stock issued to Board of Directors and employees and consultants (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 (loss) gain 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
Balance at Dec. 31, 2013	$ 232,094	$ 232,067	(9,582)	14,812	(1,058)	(4,064)		(81)	232,094
Balance (in shares) at Dec. 31, 2013	34,929,334	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 and consultants	2,706	$ 2,706							2,706
Common Stock issued to Board of Directors and employees and consultants (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 (loss) gain 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
Balance at Dec. 31, 2014	$ 294,219	$ 243,255	$ (8,224)	$ 84,931	$ (2,673)	$ (23,060)	$ (10)		$ 294,219
Balance (in shares) at Dec. 31, 2014	35,696,742	35,697,000

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities:
Net Income	$ 70,119	$ 35,133	$ 24,321
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	35,029	31,249	30,627
Deferred income taxes	(11,103)	(2,121)	618
(Gain) loss on revaluation of derivatives	(1,039)	(2,678)	167
Debt extinguishment expenses	1,370
Stock compensation	4,652	2,636	1,252
Loss on sale of property, plant & equipment	131	106	555
Provision for doubtful accounts	1,017	(705)	533
Defined benefit pension plan expense	820	(659)	50
(Gain) loss from equity investment	(785)	(436)	82
Changes in operating assets and liabilities:
Accounts receivable	(16,902)	(13,828)	(18,367)
Inventory	(8,367)	(9,600)	(5,847)
Prepaid expenses and other assets	(5,871)	(9,446)	(3,228)
Accounts payable	6,956	18,255	1,788
Accrued liabilities	4,308	11,888	4,314
Net cash provided by operating activities	80,335	59,794	36,865
Investing Activities:
Purchases of derivative financial instruments			(7,787)
Purchase of non-controlling interest		(48,567)
Investment in subsidiary, net of cash acquired	(31,474)
Loan to equity investment			(590)
Cash invested in corporate owned life insurance		(266)	(265)
Purchases of property and equipment	(38,887)	(35,861)	(26,793)
Proceeds from the sale of property and equipment	487	11	40
Net cash used in investing activities	(69,874)	(84,683)	(35,395)
Financing Activities:
Distribution paid to non-controlling interest		(3)	(290)
Cash paid for financing costs	(1,139)		(264)
Borrowing of Debt	91,592	45,669	3,326
Repayments of Debt	(79,692)	(24,496)	(22,953)
Proceeds from public offering of common stock			75,532
Cash paid for the cancellation of restricted stock	(1,113)
Excess tax benefit from equity awards	1,831	2,074	171
Redemption of Series C Preferred Stock		(8,446)	(23,340)
Series C Preferred Stock Holders dividend		(696)	(2,400)
Proceeds from the exercise of Common Stock options	7,176	4,801	774
Net cash provided by financing activities	18,655	18,903	32,477
Foreign currency effect on cash and cash equivalents	1,699	2,719	366
Net (decrease) increase in cash and cash equivalents	30,815	(3,267)	34,313
Cash and cash equivalents at beginning of period	54,885	58,152	23,839
Cash and cash equivalents at end of period	85,700	54,885	58,152
Supplemental disclosure of cash flow information:
Cash paid for interest	2,558	2,653	3,545
Cash paid for taxes	21,756	11,326	8,445
Supplemental disclosure of non-cash transactions:
Issuance of Common Stock to non-controlling interest		42,517	7,780
Issuance of Common Stock for Series C Preferred Stock conversion		15,108	1,031
Capital Lease		3,254
Common stock issued to directors and employees	$ 2,706	$ 1,509	429
W.E.T
Financing Activities:
Proceeds from sale of W.E.T. equity to non-controlling interest			$ 1,921

The Company	12 Months Ended
The Company	Dec. 31, 2014
Disclosure Company Additional Information [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. Unless the context otherwise requires, the terms “Company”, “we”, “us” and “our” used herein refer to Gentherm Incorporated and its consolidated subsidiaries. Our products can be found on the vehicles of nearly all major automotive manufacturers, spanning all major automotive markets. 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 improve overall product effectiveness and 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. Buyout of Joint Venture Partner In February, 2014, we acquired all of the previously unowned shares in our North American electronics manufacturing joint venture which had previously been accounted for under the equity method. The purchase was accounted for using the acquisition method and resulted in a gain of $785. Gentherm Global Power Technologies In April, 2014, we acquired all of the stock of privately-held Global Thermoelectric Inc., now known as Gentherm Global Power Technologies (“GPT”), in an all-cash transaction. GPT is the global market leader and developer of thermoelectric generators. GPT’s operations are located in Alberta, Canada. See Note 3 for additional information regarding the acquisition of GPT. The Company has two reportable segments for financial reporting purposes: Automotive and Industrial. Automotive The Automotive reporting segment represents 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. Automotive seat comfort systems include seat heaters, variable temperature climate control seats (“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. Thermal convenience products, such as the automotive steering wheel heater, heated and cooled cup holder and heated and cooled storage bin, are reported within the automotive segment because revenues from such products individually are not currently significant to our business. Our customers include light vehicle OEMs, commercial vehicle OEMs, and Tier 1 suppliers to the automotive OEMs, including automotive seat manufacturers. Non-automotive thermal convenience product customers include companies in the telecommunications, information technology, furniture and medical equipment industries. Industrial The Industrial reporting segment represents the combined results from GPT and Gentherm’s advanced research and product development division. 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 of GPT and the advanced research and development division are presented together as one reporting segment due to the complementary set of technologies and high concentration of thermoelectric technologies being researched. See Item 1: Business section of this report for a description of significant research and development activities. See Note 11 for information regarding segment revenues, including geographic composition, and operating income from external customers.

Summary of Significant Accounting Policies and Basis of Presentation

12 Months Ended

Dec. 31, 2014

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, 2014, 2013 and 2012, 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.

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 13 for information about the techniques used to assess the fair value of financial assets and liabilities.

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,
	2014			2013
Balance at beginning of year	$	10,308		$	8,588
Warranty claims paid or retired		(1,102	)		(676	)
Reversal of previously recorded liability		(3,744	)⁽¹⁾		—
Expense		555			2,118
Adjustment due to currency translation		(796	)		278
Balance at end of year	$	5,221		$	10,308

(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 of money market funds managed by major financial services companies. The credit risk for these cash equivalents is considered limited. The Company maintains an allowance for uncollectible accounts receivable based upon expected collectability and does not require collateral. 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. As of December 31, 2013, Johnson Controls Inc., Lear Corporation and Magna International Inc. comprised 27%, 24% and 7% 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 for an amount of an allowance for doubtful accounts.

Inventory

The Company’s inventory is valued at the lower of cost (the first-in, first-out basis) or market. 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 sales and product redesign. The following is a reconciliation of the changes in the inventory reserve:

	December 31,
	2014			2013
Balance at beginning of year	$	2,933		$	2,185
Expense		2,204			779
Inventory write off		(154	)		(6	)
Adjustment due to currency translation		(181	)		(25	)
Balance at end of year	$	4,802		$	2,933

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		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		Estimated life of tool (2 to 5 years)
Leasehold improvements		Shorter of estimated life or term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Shorter of useful life or term of lease

The Company recognized depreciation expense of $14,930, $14,810 and $14,298 for the three years ending December 31, 2014, 2013 and 2012, 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, 2012 to December 31, 2014 is as follows:

December 31, 2012	$	24,729
Exchange rate impact		1,080
December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398

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 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, competitive technologies and our projected business plans.

A total of $16,941, $17,570 and $15,817 in other intangible assets, including capitalized patent costs, were amortized in 2014, 2013 and 2012, respectively.

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

2015	$	15,848
2016		14,471
2017		14,471
2018		11,527
2019		10,121
Thereafter		1,525

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. No such triggering events occurred during the periods ended December 31, 2014 and 2013, respectively.

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

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, 2014 and 2013, respectively.

Product Revenues

Revenue from the sale of goods is recognized when the significant risks and rewards of ownership of the goods have been transferred to the buyer, the price can be measured reliably, recovery of consideration is probable and costs incurred or to be incurred from the transaction can be reasonably estimated. 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.

Litigation Reserves

We record estimated future costs related to new or ongoing litigation. Recognition of litigation reserves are recorded when there is a current obligation from a past event, a claim is probable, and the amount of the obligation can be reliably measured. These estimates include costs associated with attorney fees and potential claims and assessments less any amounts recoverable under insurance policies.

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 $2,298 and $1,691 of reimbursable tooling was capitalized within prepaid expenses and other current assets as of December 31, 2014 and 2013, 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 Federal and State tax rates. A valuation allowance is provided for net 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. Since these derivatives are designated as hedging instruments for future anticipated cash flows, the effective portion of the gain or loss resulting from the valuation at the balance sheet date is recognized as a separate item within equity. Any ineffective portion of the gain or loss is recognized in the income statement. These hedging transactions and the respective correlations meet the requirements for hedge accounting. The gains or losses recognized in equity are posted in the income statement when the hedged items are realized. Discounts or premiums for hedged contracts are recognized within earnings for the period, until maturity.

Earnings per Share

Basic earnings per share is computed by dividing net income by the weighted average number of shares of Common Stock outstanding. 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 $8,601 and $2,949, respectively, for the year ended December 31, 2014, $3,103 and $419, respectively, for the year ended December 31, 2013, and $823 and $301, respectively, for the year ended December 31, 2012.

Pension Plans

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

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

Non-Controlling Interests

Effective January 1, 2009 we adopted ASC 810 “Consolidation”, which establishes accounting and reporting standards for the non-controlling interest in a subsidiary and for the retained interest in a gain or loss when a subsidiary is deconsolidated. ASC 810 requires that a non-controlling interest, previously referred to as a minority interest, be reported as part of equity in the consolidated financial statements and that losses be allocated to the non-controlling interest even when such allocation might result in a deficit balance, reducing the losses attributable to the controlling interest. The Company’s minority interest was primarily from the non-controlling shareholders of Gentherm GmbH. As of December 31, 2013, none of these non-controlling shares of Gentherm GmbH remained outstanding and, therefore, Gentherm owned 100 percent of Gentherm GmbH due to the purchase of certain outstanding shares during the year and due to shares tendered, as further described below.

Subsequent Events

We have evaluated subsequent events through the date that our consolidated financial statements are issued. No events have occurred that would require adjustment to or disclosure in the consolidated financial statements.

Gentherm Global Power Technologies

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Gentherm Global Power Technologies

Note 3 — 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 $30,759, net of cash acquired of $3,061, 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		6,258
Assumed liabilities		(6,530	)
Net assets acquired		30,759
Cash acquired		3,061
Purchase price	$	33,820

Note 3 — 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 $6,258 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 3 — 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
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1524-128463

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7000-128479

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4922-128472

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4934-128472

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4926-128472

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1383-128463

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

+ Details

Details of Certain Financial Statement Components

12 Months Ended

Dec. 31, 2014

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components

Note 4 — Details of Certain Financial Statement Components

	December 31,
	2014			2013
Inventory:
Raw materials, net of reserve	$	48,678		$	33,783
Work in process, net of reserve		4,009			2,864
Finished goods, net of reserve		24,956			27,570
	$	77,643		$	64,217
Property and equipment:
Buildings, plant and equipment	$	76,239		$	69,555
Automobiles		499			545
Production tooling		11,256			9,747
Leasehold improvements		7,331			6,986
Computer equipment and software		15,560			15,190
Construction in progress		8,063			2,854
		118,948			104,877
Less: Accumulated depreciation *		(27,221	)		(25,643	)
	$	91,727		$	79,234
Other intangible assets:
Customer relationships	$	77,026		$	81,008
Technology		32,467			31,808
Product development costs		12,392			15,089
	$	121,885		$	127,905
Less: Accumulated amortization		(53,756	)		(44,474	)
	$	68,129		$	83,431
Accrued liabilities:
Tax accruals	$	15,696		$	7,944
Accrued warranty		5,221			10,308
Accrued employee liabilities		19,783			17,081
Liabilities from discounts and rebates		8,429			5,485
Other accrued liabilities		19,258			25,965
	$	68,387		$	66,783

*	Includes accumulated amortization of capital lease obligations.

Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Note 5 — Income Taxes

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

	December 31,
	2014			2013
Deferred tax assets:
Derivative financial instruments	$	2,461		$	5,467
Net operating losses		7,075			3,599
Research and development credits		26,204			1,130
Depreciation		3,456			2,682
Valuation reserves and accrued liabilities		4,788			3,090
Foreign tax credit		823			222
Stock compensation		2,006			1,887
Inventory		1,443			739
Patents		138			722
Defined benefit obligation		1,479			662
Other credits		593			365
Capital lease obligations		—			273
Other		144			219
		50,610			21,057
Valuation allowance		(18,037	)		(2,199	)
Deferred tax liabilities:
Intangible assets		(14,593	)		(15,836	)
Unrealized foreign currency exchange gains		(2,855	)		(1,637	)
Undistributed profits of subsidiary		(293	)		(1,367	)
Property and equipment		(162	)		(193	)
Other		(384	)		(791	)
		(18,287	)		(19,824	)
Net deferred tax asset (liability)	$	14,286		$	(966	)

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, 2014 are as follows:

	Year Ended December 31,
	2014			2013			2012
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		(0.5	%)		(1.7	%)		4.5	%
NOLs recognized upon change in tax law		—			—			(2.9	%)
Foreign, state and local tax, net of Federal benefit		1.9	%		3.6	%		3.7	%
Nondeductible expenses		1.8	%		1.4	%		1.6	%
Stock option compensation		(0.1	%)		(0.5	%)		—
Research and development credits		(0.5	%)		(2.3	%)		(5.3	%)
Effect of different tax rates of foreign jurisdictions		(10.0	%)		(10.8	%)		(10.5	%)
Other tax exempt income		(0.9	%)		—			(0.5	%)
Other		(0.1	%)		0.3	%		1.0	%
Effective rate		25.6	%		24.0	%		25.6	%

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

Jurisdiction	Amount as of December 31, 2014		Years of Expiration
U.S. Federal and state income tax	$	49,978		2018 -2034
Foreign		4,090		2018 -2019
Foreign	$	9,074		Indefinite

Note 5 — Income Taxes (Continued)

On April 1, 2014, we acquired all of the stock of GPT in an all cash transaction. The increase of deferred tax assets in 2014, as compared to 2013, related to research and development credits and the 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. During 2010, we completed a study related to the 1999 change in control limitation amount and determined that an additional $4,044 NOLs subject to the limitation were available to be utilized during 1999 through 2003.

During 2013 and 2014, we incurred NOLs in China and Vietnam associated with the startup activities of new production facilities. These NOLs are expected to be utilized in 2015 through 2017 as the locations become profitable. In 2014, we incurred NOLs in Luxembourg associated with the implementation of a new 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.

Prior to 2011 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. During 2011, our taxable income exceeded the remaining amount of NOLs recorded for book purposes representing a benefit attributable to deductions taken for tax purposes on stock option exercises. We recorded this benefit which totaled $1,831 and $2,074 for 2014 and 2013, respectively, directly to paid-in capital. The U.S. Federal NOL carryforwards include $21,856 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,
	2014		2013		2012
Income before income taxes:
Domestic	$	11,170	$	6,891	$	3,735
Foreign		83,051		39,339		28,937
Total income before income taxes	$	94,221	$	46,230	$	32,672

	Year Ended December 31,
	2014			2013			2012
Current income tax expense:
Federal	$	4,005		$	690		$	511
State and local		(15	)		495			(311	)
Foreign		24,737			9,959			7,362
Total current income tax expense	$	28,727		$	11,144		$	7,562
Deferred income tax expense (benefit):
Federal	$	(576	)	$	12		$	1,834
State and local		9			(95	)		348
Foreign		(4,058	)		36			(1,393	)
Total deferred income tax expense	$	(4,625	)	$	(47	)	$	789
Total tax expense	$	24,102		$	11,097		$	8,351

The Company’s earnings outside the US are permanently reinvested, other than the earnings of certain jurisdictions for which deferred income taxes have been provided. Quantification of the deferred tax liability, if any, associated with permanently reinvested basis differences is not practicable.

Note 5 — Income Taxes (Continued)

The American Taxpayer Relief Act of 2012 (the “Act”) was signed into law on January 2, 2013. The Act retroactively restored the research and development credit and certain exemptions under the foreign income tax rules. Because a change in tax law is accounted for in the period of enactment, the retroactive effect of the Act on the Company’s U.S. Federal taxes for 2012, a benefit of approximately $1,300 was recognized in 2013.

The Company is subject to taxation in the United States and various state and foreign jurisdictions. As of December 31, 2014, the Company’s tax years from 2007 through 2014 are subject to examination by the various tax authorities. With limited exceptions, as of December 31, 2014, the Company is no longer subject to U.S. Federal, state, local, or foreign examinations by tax authorities for years before 2007. No U.S. Federal or state tax audits are currently ongoing. Tax audits are currently ongoing in Germany for tax years 2008 through 2011.

At December 31, 2014, 2013 and 2012, the Company had total unrecognized tax benefits of $4,651, $2,241 and $2,191, 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,
	2014			2013			2012
Balance at beginning of year	$	2,241		$	2,191			1,678
Additions based on tax position related to current year		43			2			67
Additions based on tax positions related to prior year		2,991			580			413
Reductions from settlements and statute of limitation expiration		(432	)		(599	)		—
Effect of foreign currency translation		(192	)		67			33
Balance at end of year	$	4,651		$	2,241		$	2,191

The Company classifies income tax-related penalties and net interest as income tax expense. In the years ended December 31, 2014, 2013 and 2012 income tax related interest and penalties were insignificant. The Company does not believe that it is reasonable possible that there will be decrease to its unrecognized tax benefits in the next 12 months due to audit settlements or statute expirations.

Debt

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Debt

Note 6 — Debt

Credit Agreement

On August 7, 2014, the Company, together with certain direct and indirect subsidiaries, entered into a new Credit Agreement (the “Credit Agreement”) with a syndicate of banks led by Bank of America.

The Credit Agreement provides for a $50,000 secured term loan facility for Gentherm (the “US 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 “US 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.

All obligations under the Credit Agreement (including all the obligations of any US or non-US loan party) are unconditionally guaranteed by Gentherm and specified US 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-US subsidiaries). Further, specified foreign subsidiaries guarantee all obligations of the non-US loan parties under the Credit Agreement.

The following amounts were borrowed under the credit agreement:


Borrowing proceeds on August 7, 2014	Currency Borrowed		US Dollars
US Term Loan	$	50,000	$	50,000
US Revolving Note	C$	15,000		13,695
Europe Term Loan	€	20,000		26,730

Note 6 — Debt (Continued)

On August 7, 2014, all amounts owed under the existing US Term Note, US Revolving Note, Europe Term Note and W.E.T. Term Note (collectively, the “Old Credit Agreements”) were repaid without penalty. The Old Credit Agreements and related security and pledge agreements were terminated as of such date. Unamortized and additional financing costs totaling $1,370 related to the Old Credit Agreements were expensed to debt retirement expense in the year ended December 31, 2014.

The Company incurred $1,139 in expenses associated with the Credit Agreement of which $451 was recorded as deferred financing costs and will be amortized over the life of the Credit Agreement using the effective interest method. Principal outstanding under the US Term Loan, the Europe Term Loan and the US Revolving Note will be due and payable in full on August 7, 2019.

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”). Base Rate Loans are equal to the highest of the Federal Funds Rate (0.06% at December 31, 2014) plus 0.50%, Bank of America’s prime rate (3.25% as of December 31, 2014), or a one month Eurocurrency rate plus 1.00%. Eurocurrency Rate Loans denominated in US Dollars or European Euros (“Euros”) are equal to the London Interbank Offered Rate and the Canadian Dealer Offered Rate for Canadian Dollar denominations. All loans denominated in a currency other than the US Dollar, including the Europe Term Loan, must be Eurocurrency Rate Loans. Interest is payable at least quarterly.

The Applicable Rate from the initial period of August 7, 2014 until we submit our year-end Consolidated Leverage Ratio was 1.75% per annum for Eurocurrency Rate Loans and 0.75% for Base Rate Loans. After the initial period, the Applicable Rate will vary 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, 2014 qualified us for the lowest Applicable Rate available. As such, our interest rates will be reduced during the first quarter of 2015.

DEG Loan

The Company has a fixed interest rate loan with the German Investment Corporation, a subsidiary of KfW banking group (“DEG”), a German government-owned development bank (“DEG Loan”). The DEG Loan is subject to semi-annual principal payments beginning March, 2015 and ending September, 2019. Under the terms of the DEG Loan, the Company must maintain a minimum Debt-to-Equity Ratio, Current Ratio and Debt Service Coverage Ratio based on the financial statements of Gentherm’s wholly owned subsidiary, Gentherm Automotive Systems (China) Limited, as defined by the DEG Loan agreement.

Capital Lease

The Company has a capital lease agreement for an enterprise resource planning system. Under the terms of the lease, the Company must maintain certain financial covenants. Ownership of the system will be transferred to the Company at the end of the agreement.

Note 6 — Debt (Continued)

As of December 31, 2014, we were in compliance with all terms as outlined in the Credit Agreement, the DEG Loan and the capital lease agreement. The following table summarizes the Company’s debt at December 31, 2014.

	Interest Rate			Principal Balance
Credit Agreement:
US Term Loan		2.00	%	$	49,375
Europe Term Loan		1.81	%		23,963
US Revolving Note		1.92	%		12,000
DEG 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 following table summarizes the Company’s debt at December 31, 2013.

	Interest Rate			Principal Balance
Old Credit Agreements:
US Term Note		2.50	%		24,500
Europe Term Note		2.49	%		38,899
W.E.T. Term Note		2.01	%		10,920
DEG Loan		4.25	%		5,561
Capital lease		4.20	%		2,440
Total debt					82,320
Current portion					(21,439	)
Long-term debt, less current maturities				$	60,881

The scheduled principal maturities of our debt as of December 31, 2014 is as follows:

Year	US Term Loan		Europe Term Loan		U.S. Revolving Note		DEG Loan		Capital Lease		Total
2015	$	2,500	$	1,213	$	—	$	961	$	632	$	5,306
2016		2,812		1,365		—		961		—		5,138
2017		3,750		1,820		—		961		—		6,531
2018		4,063		1,972		—		961		—		6,996
2019		36,250		17,593		12,000		961		—		66,804
Total	$	49,375	$	23,963	$	12,000	$	4,805	$	632	$	90,775

Accounting for Stock Based Compensation

12 Months Ended

Dec. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Accounting for Stock Based Compensation

Note 7 — Accounting for Stock Based Compensation

On May 16, 2013, the Compensation Committee of the Company’s Board of Directors 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, 2014 the Company had an aggregate of 2,188,000 shares of common stock available to issue under the 2013 Plan.

Note 7 — Accounting for Stock Based Compensation (Continued)

All plans are administered by the Compensation Committee of the Board of Directors. The selection of participants, allotment of shares, determination of price and other conditions are determined by the Board of Directors 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.

Options, restricted shares and SARs are generally granted with requisite service periods typically ranging between three to five years for employees and one year for directors. Stock based compensation award vesting may be accelerated at the discretion of the Board of Directors.

Total unrecognized compensation cost related to nonvested options, restricted stock and SARs outstanding under all of the Company’s equity plans was $9,414 and $10,613 as of December 31, 2014 and 2013, respectively. That cost is expected to be recognized over a weighted average period of two years. Compensation expense for the years ended December 31, 2014, 2013 and 2012 was $8,601, $3,103 and $823, respectively.

Stock Options

The following table summarizes stock option activity during the three year period ended December 31, 2014:

Options	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2011		2,163,825		$	8.12
Granted		160,000			12.88
Exercised		(176,896	)		4.46
Forfeited		(17,000	)		4.05
Outstanding at December 31, 2012		2,129,929		$	8.82		6.99	$	5,640
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		(132,500	)		19.30
Outstanding at December 31, 2014		1,684,534			19.11		5.10	$	30,111
Exercisable at December 31, 2012		1,520,720		$	7.57		6.20	$	5,966
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

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:

	2014	2013	2012
Expected volatility	37%	34%	47%
Weighted average expected volatility	37%	34%	47%
Expected lives	3 yrs.	3 yrs.	3 yrs.
Risk-free interest rate	0.60-1.00%	0.57-0.65%	0.43%
Expected dividend yield	none	none	none

Note 7 — Accounting for Stock Based Compensation (Continued)

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.

The weighted-average grant-date fair value of options granted during the year ended December 31, 2014, 2013 and 2012 was $7.88, $4.71 and $4.13, respectively. The total intrinsic value of options exercised during the year ended December 31, 2014, 2013 and 2012 was $21,249, $8,301 and $1,663, respectively.

Restricted Stock

The following table summarizes restricted stock activity during the three year period ended December 31, 2014:

Unvested Restricted Shares	Shares			Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2011		24,900		$	16.69
Granted		155,280			12.94
Vested		(17,922	)		15.54
Forfeited		—			—
Outstanding 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

The total fair value of shares vested in 2014, 2013 and 2012 was $5,329, $2,076, $210, respectively.

Stock Appreciation Rights

The following table summarizes SARs activity during the three year period ended December 31, 2014:

Stock Appreciation Rights	Units			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2012		—		$	—
Granted		495,000			19.19
Exercised		—			—
Forfeited		—			—
Outstanding at December 31, 2013		495,000		$	19.19		6.5	$	3,770
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
Exercisable at December 31, 2013		—		$	—		—		—
Exercisable at December 31, 2014		35,000		$	19.43		5.53	$	602

Earnings per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Earnings per Share

Note 8 — 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,
	2014		2013		2012
Weighted average number of shares for calculation of basic EPS – Common Stock		35,411,608		33,652,646		28,352,864
Stock options under the 1997, 2006, 2011 and 2013 equity plans		637,723		470,995		509,599
Weighted average number of shares for calculation of diluted EPS – Common Stock		36,049,331		34,123,641		28,862,463

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

	Year ended December 31,
	2014		2013		2012
Stock options outstanding for the 1997, 2006, 2011 and 2013 equity plans		155,000		550,000		149,000
Series C Convertible Preferred Stock		—		—		1,531,891
		155,000		550,000		1,680,891

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 9 — 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, 2014, under all non-cancelable operating leases with terms exceeding one year is as follows:


2015	$	6,932
2016		4,906
2017		2,008
2018		845
2019		797
2020 or later		219
Total	$	15,707

Rent expense under all of the Company’s operating leases was $6,331, $5,992 and $5,996 for 2014, 2013 and 2012, 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 and no material legal proceeding was terminated, settled or otherwise resolved during the fiscal year ended December 31, 2014.

Shareholder Rights Plan	12 Months Ended
Shareholder Rights Plan	Dec. 31, 2014
Warrants And Rights Note Disclosure [Abstract]
Shareholder Rights Plan	Note 10 — Shareholder Rights Plan The Company’s Board of Directors 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”). 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 acquiror’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, 2014

Segment Reporting [Abstract]

Segment Reporting

Note 11 — 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).

As part of the initiative to integrate the operations of historical Gentherm and W.E.T. Automotive Systems AG (now known as Gentherm GmbH), changes were made to Gentherm’s structure of internal organization. The financial information used by our chief operating decision maker to assess performance and allocation resources reflects changes brought about through this initiative.

Gentherm’s organization structure no longer treats the operations of historical Gentherm and Gentherm GmbH separately. The integration expanded the research and development activities analyzed within the advanced technology segment and moved certain selling, general and administrative costs previously reported within the Gentherm GmbH segment to corporate reconciling items.

As discussed in Note 3, Gentherm acquired GPT on April 1, 2014. The acquisition enhanced key elements of the Company’s business strategy to expand the breadth of products derived from core thermal technologies, as well as the markets in which they are applied. The chief operation decision maker evaluates GPT’s performance separate from the automotive segment. The operating results of GPT and the advanced research and development division are presented together as one reporting segment due to their complementary focus on thermoelectric technologies and related products.

The Company’s reportable segments are as follows:

1.	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, including those sponsored by the U.S. Department of Energy, the Germany Ministry of Economics and Technology and the European Union.

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

Note 11 — 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, 2014, 2013 and 2012. 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, 2014, goodwill assigned to our Automotive and Industrial segments were $24,140 and $6,258, respectively. Goodwill as of December 31, 2013 and 2012 pertained entirely to our Automotive segment.

	Automotive		Industrial			Reconciling Items			Consolidated Total
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		(8,922	)		(37,289	)		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
2012:
Product revenues	$	554,979	$	—		$	—		$	554,979
Depreciation and amortization		29,188		247			1,192			30,627
Operating income (loss)		71,995		(5,252	)		(30,087	)		36,656

The Industrial operating loss is net of reimbursement for developmental expense of $8,885, $2,324 and $2,239 for the years ended 2014, 2013 and 2012, respectively. Reconciling items include selling, general and administrative costs of $36,214, $32,597 and $30,087, respectively, for the years ended December 31, 2014, 2013 and 2012 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:

	2014		%			2013		%			2012		%
United States	$	361,706		45	%	$	292,079		44	%	$	233,737		42	%
Germany		90,243		11	%		84,035		13	%		67,132		12	%
Korea		89,515		11	%		58,329		9	%		42,878		8	%
China		69,910		9	%		70,671		11	%		55,674		10	%
Japan		47,528		6	%		39,844		6	%		35,279		6	%
Czech Republic		25,738		3	%		17,247		3	%		15,361		3	%
United Kingdom		24,712		3	%		18,864		3	%		13,194		2	%
Canada		20,293		2	%		14,254		2	%		17,582		3	%
Mexico		19,590		2	%		15,670		2	%		14,988		3	%
Other		62,065		8	%		51,089		7	%		59,154		11	%
Total Non U.S.		449,594		56	%		370,003		56	%		321,242		58	%
	$	811,300		100	%	$	662,082		100	%	$	554,979		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:


	2014			2013			2012
Johnson Controls (domestic)		24	%		27	%		22	%
Lear (domestic)		21	%		18	%		18	%
Bosch (foreign)		9	%		10	%		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
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

+ Details

Executive Nonqualified Defined Benefit Plan

12 Months Ended

Dec. 31, 2014

Compensation And Retirement Disclosure [Abstract]

Executive Nonqualified Defined Benefit Plan

Note 12 — Executive Nonqualified Defined Benefit Plan

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:

	2014		2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	1,848	$	1,633
Service cost		335		355
Interest cost		78		53
Actuarial loss(gain)		213		(193	)
Net periodic benefit cost		626		215
Benefit obligation at end of year	$	2,474	$	1,848

The benefit obligation is included in the Company’s consolidated balance sheet as a non-current liability. 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 3.25%, 4.25% and 3.25% was used to determine the benefit obligation and the net periodic service cost for years ended December 31, 2014, 2013 and 2012, respectively.

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 $2,056 and $1,962 as of December 31, 2014 and 2013, respectively, and was included in other non-current assets.

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:

	2014			2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	6,019		$	5,392
Service cost		304			—
Interest cost		181			180
Paid pension distributions		(278	)		(291	)
Actuarial (gains)/losses		1,385			43
Past service cost		1,271			445
Exchange rate impact		(762	)		250
Benefit obligation at end of year	$	8,120		$	6,019

Note 12 — Executive Nonqualified Defined Benefit Plan (Continued)

The following table sets forth the fair value of the plan assets for the periods ending December 31, 2014 and 2013:

	2014			2013
Change in plan assets:
Plan assets at beginning of year	$	2,340		$	1,548
Actual return on plan assets		89			59
Net contributions		958			664
Actuarial gains/(losses)		531			(24	)
Exchange rate impact		(303	)		93
Plan assets at end of year	$	3,615		$	2,340

The Gentherm GmbH defined benefit plan is underfunded by $4,505 and $3,679 as of December 31, 2014 and 2013, respectively. The portion of the net benefit obligation payable within the next 12 months is included in the Company’s consolidated balance sheet within accrued liabilities. 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:

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

Plan assets are comprised of Gentherm GmbH’s pension insurance policies and are pledged to the beneficiaries of the plan. Fair value of the pension insurance policies is determined on the basis of the calculation of the underlying insurance charge. Due to the basis of the calculation, pension plan assets are determined to be Level 2 investments. 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.

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

Year
2015	$	276
2016		277
2017		276
2018		275
2019		274
2020 - 2024		1,360
Total	$	2,738

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 of employee contributions. The Plan also allows for additional discretionary contributions. Gentherm made $543, $191 and $161 in matching contributions to the 401(k) plan in 2014, 2013 and 2012, respectively.

Fair Value Measurement	12 Months Ended
Fair Value Measurement	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 13 — 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 that prioritizes observable and unobservable inputs used 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: Observable prices that are based on inputs not quoted on active markets, but corroborated by market data. 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. Except for derivative instruments (see Note 15), pension liabilities and pension plan assets (see Note 12), the Company has no financial assets and liabilities that are carried at fair value at December 31, 2014 and 2013. The carrying amounts of financial instruments comprising cash and cash equivalents, and accounts receivable approximate their fair values due to their short-term nature. The carrying value of the Company’s long-term debt approximates its fair value because interest charged on the loan balance is variable (see Note 6). Unobservable inputs were used to measure the fair value of acquired assets and assumed liabilities of GPT (see Note 3). 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. As of December 31, 2014 and 2013, the Company did not realize any changes to the fair value of these assets due to events that negatively impacted their recoverability.

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2014

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 14 — Derivative Financial Instruments

We are exposed to market risk from changes in foreign currency exchange rates and short-term interest rates. 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 Euro, Mexican Peso, Canadian Dollar, Hungarian Forint, Ukrainian Hryvnia, Japanese Yen, Chinese Renminbi and Korean Won.

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. 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. We record the ineffective portion of foreign currency hedging instruments, if any, to foreign currency gain (loss) in the consolidated condensed statements of income. 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 a market approach to value derivative instruments, analyzing observable benchmark rates at commonly quoted intervals for the instrument’s full term.

In March 2008, Gentherm GmbH, entered into a 10 year currency related interest rate swap (“CRS”) having a notional value of €10,000, or $12,133 as of December 31, 2014, in order to offset the interest rate risk associated with a debt financing which was repaid prior our acquisition of Gentherm GmbH. The counterparty of the CRS was HypoVereinsbank AG (now UniCredit Bank AG, “UniCredit”), at the time, their main bank. Under this agreement, Gentherm GmbH receives interest equal to the six month Euro Interbank Offered Rate (“EURIBOR”), 0.17% at December 31, 2014, plus 1.40% and pays interest equal to the six month EURIBOR when the exchange rate between the European Euro (“EUR”) and the Swiss Franc (“CHF”) equals or exceeds 1.46 EUR to the CHF. When the exchange rate is less than 1.46 (it was 1.20 at December 31, 2014), Gentherm GmbH pays interest equal to the six month EURIBOR plus a premium. The premium is calculated as [(1.46 – current EUR/CHF rate)/current EUR/CHF rate] x 100.

Note 14 — Derivative Financial Instruments (Continued)

In 2011, Gentherm GmbH brought a lawsuit against UniCredit, because of the recommendation to enter into the CRS. On March 25, 2013, the Munich District Court in Munich, Germany ruled in favor of Gentherm GmbH, asserting that UniCredit had a conflict of interest as financial advisor and counterparty to the CRS and violated its duty to disclose the initial negative market value of the CRS. The Munich District Court ruled that UniCredit must (1) pay €144 to Gentherm GmbH and (2) bear the costs of all future obligations under the CRS, which were €7,553 or $9,164 as of December 31, 2014, plus additional accrued liabilities for past due payments under the CRS of approximately €7,146, or $8,670 as of December 31, 2014. UniCredit has appealed the decision. The appeal is pending. As a result, the Company cannot be certain that any portion of the award by the Munich District Court will be upheld. See the derivatives table below for information about our future obligations under the CRS as of December 31, 2014 and 2013, respectively. Gentherm GmbH has entered into an offsetting derivative contract designed to limit the market risk of payments due under the CRS through the end of the CRS agreement, in 2018.

Information related to the recurring fair value measurement of derivative 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					$	145
				Non‑current assets		1,345					$	1,345
Total foreign currency derivatives					$	1,490					$	1,490

Information related to the recurring fair value measurement of derivative instruments in our consolidated balance sheet as of December 31, 2013 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	$	(2,471	)
							Non current liabilities		(9,358	)
Total CRS								$	(11,829	)	$	(11,829	)
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	1					$	1
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	66					$	66
				Non‑current assets		1,969					$	1,969
Total foreign currency derivatives					$	2,036					$	2,036
Interest rate swap derivatives	Cash flow hedge	Level 2					Current liabilities	$	(81	)	$	(81	)

Note 14 — Derivative Financial Instruments (Continued)

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


	Location	Year Ended December 31, 2014			Year Ended December 31, 2013
Foreign currency derivatives	Revaluation of derivatives	$	640			(1,327	)
	Product Revenues		(390	)		—
	Cost of Sales		(174	)		—
	Selling, general and administrative		(161	)		—
	Other Comprehensive Income		(10	)		—
	Foreign currency gain (loss)		(976	)		(761	)
Total foreign currency derivatives		$	(1,071	)	$	(2,088	)
CRS	Revaluation of derivatives	$	(1,157	)	$	2,335
Interest Rate derivatives	Revaluation of derivatives	$	(1	)	$	(2	)
	Other Comprehensive Income		81			143

We did not incur any hedge ineffectiveness during the twelve months ended December 31, 2014 and 2013.

- 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=35706170&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
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959

Reference 11: 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.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

New Accounting Pronouncements	12 Months Ended
New Accounting Pronouncements	Dec. 31, 2014
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
New Accounting Pronouncements	Note 15 — 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, 2016. 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. Gentherm has developed a plan to complete the five-step contract review process for all existing contracts with customers. We are still in the process of determining the impact the implementation of ASU 2014-09 will have on the Company’s financial statements.

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2014

Valuation And Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

GENTHERM INCORPORATED

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2014, 2013 and 2012

(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, 2012		1,937		529		4			4			2,474
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
Allowance for Deferred Income Tax Assets
Year Ended December 31, 2012		3,702		—		(1,503	)		—			2,199
Year Ended December 31, 2013		2,199		—		—			—			2,199
Year Ended December 31, 2014		2,199		—		16,674			(836	)		18,037
Reserve for Inventory
Year Ended December 31, 2012		1,127		1,307		(34	)		(215	)		2,185
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

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

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Consolidation

Cash and Cash Equivalents

Disclosures About Fair Value of Financial Instruments

Use of Estimates

Accrued Warranty Costs


	December 31,
	2014			2013
Balance at beginning of year	$	10,308		$	8,588
Warranty claims paid or retired		(1,102	)		(676	)
Reversal of previously recorded liability		(3,744	)⁽¹⁾		—
Expense		555			2,118
Adjustment due to currency translation		(796	)		278
Balance at end of year	$	5,221		$	10,308

(1)

Concentration of Credit Risk

Allowance for Doubtful Accounts

Inventory

	December 31,
	2014			2013
Balance at beginning of year	$	2,933		$	2,185
Expense		2,204			779
Inventory write off		(154	)		(6	)
Adjustment due to currency translation		(181	)		(25	)
Balance at end of year	$	4,802		$	2,933

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		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		Estimated life of tool (2 to 5 years)
Leasehold improvements		Shorter of estimated life or term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Shorter of useful life or term of lease

The Company recognized depreciation expense of $14,930, $14,810 and $14,298 for the three years ending December 31, 2014, 2013 and 2012, respectively.

Goodwill and Other Intangible Assets

December 31, 2012	$	24,729
Exchange rate impact		1,080
December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398

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 $16,941, $17,570 and $15,817 in other intangible assets, including capitalized patent costs, were amortized in 2014, 2013 and 2012, respectively.

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

2015	$	15,848
2016		14,471
2017		14,471
2018		11,527
2019		10,121
Thereafter		1,525

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

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

Product Revenues

Litigation Reserves

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

Non-Controlling Interests

Subsequent Events

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

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, 2016. 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. Gentherm has developed a plan to complete the five-step contract review process for all existing contracts with customers. We are still in the process of determining the impact the implementation of ASU 2014-09 will have on the Company’s financial statements.

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

12 Months Ended

Dec. 31, 2014

Reconciliation of Changes in Accrued Warranty Costs


	December 31,
	2014			2013
Balance at beginning of year	$	10,308		$	8,588
Warranty claims paid or retired		(1,102	)		(676	)
Reversal of previously recorded liability		(3,744	)⁽¹⁾		—
Expense		555			2,118
Adjustment due to currency translation		(796	)		278
Balance at end of year	$	5,221		$	10,308

(1)

Reconciliation of Changes in Inventory Reserve

	December 31,
	2014			2013
Balance at beginning of year	$	2,933		$	2,185
Expense		2,204			779
Inventory write off		(154	)		(6	)
Adjustment due to currency translation		(181	)		(25	)
Balance at end of year	$	4,802		$	2,933

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		5 to 50 years
Plant and Equipment		1 to 20 years
Production tooling		Estimated life of tool (2 to 5 years)
Leasehold improvements		Shorter of estimated life or term of lease
Computer equipment and software		1 to 10 years
Capital Leases		Shorter of useful life or term of lease

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

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

Roll Forward of Goodwill from Acquisition

December 31, 2012	$	24,729
Exchange rate impact		1,080
December 31, 2013	$	25,809
Goodwill arising from the acquisition of GPT		6,258
Exchange rate impact		(1,669	)
December 31, 2014	$	30,398

Estimate of Total Intangible Asset Amortization

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

2015	$	15,848
2016		14,471
2017		14,471
2018		11,527
2019		10,121
Thereafter		1,525

Gentherm Global Power Technologies (Tables)

12 Months Ended

Dec. 31, 2014

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		6,258
Assumed liabilities		(6,530	)
Net assets acquired		30,759
Cash acquired		3,061
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

Details of Certain Financial Statement Components (Tables)

12 Months Ended

Dec. 31, 2014

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components

	December 31,
	2014			2013
Inventory:
Raw materials, net of reserve	$	48,678		$	33,783
Work in process, net of reserve		4,009			2,864
Finished goods, net of reserve		24,956			27,570
	$	77,643		$	64,217
Property and equipment:
Buildings, plant and equipment	$	76,239		$	69,555
Automobiles		499			545
Production tooling		11,256			9,747
Leasehold improvements		7,331			6,986
Computer equipment and software		15,560			15,190
Construction in progress		8,063			2,854
		118,948			104,877
Less: Accumulated depreciation *		(27,221	)		(25,643	)
	$	91,727		$	79,234
Other intangible assets:
Customer relationships	$	77,026		$	81,008
Technology		32,467			31,808
Product development costs		12,392			15,089
	$	121,885		$	127,905
Less: Accumulated amortization		(53,756	)		(44,474	)
	$	68,129		$	83,431
Accrued liabilities:
Tax accruals	$	15,696		$	7,944
Accrued warranty		5,221			10,308
Accrued employee liabilities		19,783			17,081
Liabilities from discounts and rebates		8,429			5,485
Other accrued liabilities		19,258			25,965
	$	68,387		$	66,783

*	Includes accumulated amortization of capital lease obligations.

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014			2013
Deferred tax assets:
Derivative financial instruments	$	2,461		$	5,467
Net operating losses		7,075			3,599
Research and development credits		26,204			1,130
Depreciation		3,456			2,682
Valuation reserves and accrued liabilities		4,788			3,090
Foreign tax credit		823			222
Stock compensation		2,006			1,887
Inventory		1,443			739
Patents		138			722
Defined benefit obligation		1,479			662
Other credits		593			365
Capital lease obligations		—			273
Other		144			219
		50,610			21,057
Valuation allowance		(18,037	)		(2,199	)
Deferred tax liabilities:
Intangible assets		(14,593	)		(15,836	)
Unrealized foreign currency exchange gains		(2,855	)		(1,637	)
Undistributed profits of subsidiary		(293	)		(1,367	)
Property and equipment		(162	)		(193	)
Other		(384	)		(791	)
		(18,287	)		(19,824	)
Net deferred tax asset (liability)	$	14,286		$	(966	)

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, 2014 are as follows:

	Year Ended December 31,
	2014			2013			2012
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		(0.5	%)		(1.7	%)		4.5	%
NOLs recognized upon change in tax law		—			—			(2.9	%)
Foreign, state and local tax, net of Federal benefit		1.9	%		3.6	%		3.7	%
Nondeductible expenses		1.8	%		1.4	%		1.6	%
Stock option compensation		(0.1	%)		(0.5	%)		—
Research and development credits		(0.5	%)		(2.3	%)		(5.3	%)
Effect of different tax rates of foreign jurisdictions		(10.0	%)		(10.8	%)		(10.5	%)
Other tax exempt income		(0.9	%)		—			(0.5	%)
Other		(0.1	%)		0.3	%		1.0	%
Effective rate		25.6	%		24.0	%		25.6	%

Net Operating Loss Carryforwards

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

Jurisdiction	Amount as of December 31, 2014		Years of Expiration
U.S. Federal and state income tax	$	49,978		2018 -2034
Foreign		4,090		2018 -2019
Foreign	$	9,074		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,
	2014		2013		2012
Income before income taxes:
Domestic	$	11,170	$	6,891	$	3,735
Foreign		83,051		39,339		28,937
Total income before income taxes	$	94,221	$	46,230	$	32,672

Provision for Income Taxes

	Year Ended December 31,
	2014			2013			2012
Current income tax expense:
Federal	$	4,005		$	690		$	511
State and local		(15	)		495			(311	)
Foreign		24,737			9,959			7,362
Total current income tax expense	$	28,727		$	11,144		$	7,562
Deferred income tax expense (benefit):
Federal	$	(576	)	$	12		$	1,834
State and local		9			(95	)		348
Foreign		(4,058	)		36			(1,393	)
Total deferred income tax expense	$	(4,625	)	$	(47	)	$	789
Total tax expense	$	24,102		$	11,097		$	8,351

Reconciliation of Unrecognized Tax Benefits

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


	Year Ended December 31,
	2014			2013			2012
Balance at beginning of year	$	2,241		$	2,191			1,678
Additions based on tax position related to current year		43			2			67
Additions based on tax positions related to prior year		2,991			580			413
Reductions from settlements and statute of limitation expiration		(432	)		(599	)		—
Effect of foreign currency translation		(192	)		67			33
Balance at end of year	$	4,651		$	2,241		$	2,191

Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Amounts borrowed under credit agreement

The following amounts were borrowed under the credit agreement:


Borrowing proceeds on August 7, 2014	Currency Borrowed		US Dollars
US Term Loan	$	50,000	$	50,000
US Revolving Note	C$	15,000		13,695
Europe Term Loan	€	20,000		26,730

Summary of Company's Debt

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

	Interest Rate			Principal Balance
Credit Agreement:
US Term Loan		2.00	%	$	49,375
Europe Term Loan		1.81	%		23,963
US Revolving Note		1.92	%		12,000
DEG 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 following table summarizes the Company’s debt at December 31, 2013.

	Interest Rate			Principal Balance
Old Credit Agreements:
US Term Note		2.50	%		24,500
Europe Term Note		2.49	%		38,899
W.E.T. Term Note		2.01	%		10,920
DEG Loan		4.25	%		5,561
Capital lease		4.20	%		2,440
Total debt					82,320
Current portion					(21,439	)
Long-term debt, less current maturities				$	60,881

Principal Maturities of Debt

The scheduled principal maturities of our debt as of December 31, 2014 is as follows:

Year	US Term Loan		Europe Term Loan		U.S. Revolving Note		DEG Loan		Capital Lease		Total
2015	$	2,500	$	1,213	$	—	$	961	$	632	$	5,306
2016		2,812		1,365		—		961		—		5,138
2017		3,750		1,820		—		961		—		6,531
2018		4,063		1,972		—		961		—		6,996
2019		36,250		17,593		12,000		961		—		66,804
Total	$	49,375	$	23,963	$	12,000	$	4,805	$	632	$	90,775

- 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

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Accounting for Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014:

Options	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2011		2,163,825		$	8.12
Granted		160,000			12.88
Exercised		(176,896	)		4.46
Forfeited		(17,000	)		4.05
Outstanding at December 31, 2012		2,129,929		$	8.82		6.99	$	5,640
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		(132,500	)		19.30
Outstanding at December 31, 2014		1,684,534			19.11		5.10	$	30,111
Exercisable at December 31, 2012		1,520,720		$	7.57		6.20	$	5,966
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

Fair Value of Option on Date of Grant

	2014	2013	2012
Expected volatility	37%	34%	47%
Weighted average expected volatility	37%	34%	47%
Expected lives	3 yrs.	3 yrs.	3 yrs.
Risk-free interest rate	0.60-1.00%	0.57-0.65%	0.43%
Expected dividend yield	none	none	none

Restricted Stock Activity

The following table summarizes restricted stock activity during the three year period ended December 31, 2014:

Unvested Restricted Shares	Shares			Weighted- Average Grant-Date Fair Value
Nonvested at December 31, 2011		24,900		$	16.69
Granted		155,280			12.94
Vested		(17,922	)		15.54
Forfeited		—			—
Outstanding 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

SARs Activity

The following table summarizes SARs activity during the three year period ended December 31, 2014:

Stock Appreciation Rights	Units			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2012		—		$	—
Granted		495,000			19.19
Exercised		—			—
Forfeited		—			—
Outstanding at December 31, 2013		495,000		$	19.19		6.5	$	3,770
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
Exercisable at December 31, 2013		—		$	—		—		—
Exercisable at December 31, 2014		35,000		$	19.43		5.53	$	602

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Basic and Diluted Shares of Consolidated Condensed Statements of Income

	Year ended December 31,
	2014		2013		2012
Weighted average number of shares for calculation of basic EPS – Common Stock		35,411,608		33,652,646		28,352,864
Stock options under the 1997, 2006, 2011 and 2013 equity plans		637,723		470,995		509,599
Weighted average number of shares for calculation of diluted EPS – Common Stock		36,049,331		34,123,641		28,862,463

Common Stock Issuable upon Exercise of Certain Stock Options

	Year ended December 31,
	2014		2013		2012
Stock options outstanding for the 1997, 2006, 2011 and 2013 equity plans		155,000		550,000		149,000
Series C Convertible Preferred Stock		—		—		1,531,891
		155,000		550,000		1,680,891

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Lease Payments


2015	$	6,932
2016		4,906
2017		2,008
2018		845
2019		797
2020 or later		219
Total	$	15,707

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Segment Information about Reported Product Revenues and Operating Income

	Automotive		Industrial			Reconciling Items			Consolidated Total
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		(8,922	)		(37,289	)		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
2012:
Product revenues	$	554,979	$	—		$	—		$	554,979
Depreciation and amortization		29,188		247			1,192			30,627
Operating income (loss)		71,995		(5,252	)		(30,087	)		36,656

Product Revenues Information by Geographic Area

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

	2014		%			2013		%			2012		%
United States	$	361,706		45	%	$	292,079		44	%	$	233,737		42	%
Germany		90,243		11	%		84,035		13	%		67,132		12	%
Korea		89,515		11	%		58,329		9	%		42,878		8	%
China		69,910		9	%		70,671		11	%		55,674		10	%
Japan		47,528		6	%		39,844		6	%		35,279		6	%
Czech Republic		25,738		3	%		17,247		3	%		15,361		3	%
United Kingdom		24,712		3	%		18,864		3	%		13,194		2	%
Canada		20,293		2	%		14,254		2	%		17,582		3	%
Mexico		19,590		2	%		15,670		2	%		14,988		3	%
Other		62,065		8	%		51,089		7	%		59,154		11	%
Total Non U.S.		449,594		56	%		370,003		56	%		321,242		58	%
	$	811,300		100	%	$	662,082		100	%	$	554,979		100	%

Percentage of Total Product Revenues Generated from Customers


	2014			2013			2012
Johnson Controls (domestic)		24	%		27	%		22	%
Lear (domestic)		21	%		18	%		18	%
Bosch (foreign)		9	%		10	%		10	%

Executive Nonqualified Defined Benefit Plan (Tables)

12 Months Ended

Dec. 31, 2014

Defined Benefit Plan Disclosure [Line Items]

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

	2014		2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	1,848	$	1,633
Service cost		335		355
Interest cost		78		53
Actuarial loss(gain)		213		(193	)
Net periodic benefit cost		626		215
Benefit obligation at end of year	$	2,474	$	1,848

Fair Value of Plan Assets

The following table sets forth the fair value of the plan assets for the periods ending December 31, 2014 and 2013:

	2014			2013
Change in plan assets:
Plan assets at beginning of year	$	2,340		$	1,548
Actual return on plan assets		89			59
Net contributions		958			664
Actuarial gains/(losses)		531			(24	)
Exchange rate impact		(303	)		93
Plan assets at end of year	$	3,615		$	2,340

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

	2014
Discount rate		1.95	%
Expected long term rate of return on plan assets		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
2015	$	276
2016		277
2017		276
2018		275
2019		274
2020 - 2024		1,360
Total	$	2,738

Gentherm GmbH

Defined Benefit Plan Disclosure [Line Items]

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

	2014			2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$	6,019		$	5,392
Service cost		304			—
Interest cost		181			180
Paid pension distributions		(278	)		(291	)
Actuarial (gains)/losses		1,385			43
Past service cost		1,271			445
Exchange rate impact		(762	)		250
Benefit obligation at end of year	$	8,120		$	6,019

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Information related to the recurring fair value measurement of derivative 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					$	145
				Non‑current assets		1,345					$	1,345
Total foreign currency derivatives					$	1,490					$	1,490

Information related to the recurring fair value measurement of derivative instruments in our consolidated balance sheet as of December 31, 2013 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	$	(2,471	)
							Non current liabilities		(9,358	)
Total CRS								$	(11,829	)	$	(11,829	)
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	1					$	1
Foreign currency derivatives	Not a hedge	Level 2		Current assets	$	66					$	66
				Non‑current assets		1,969					$	1,969
Total foreign currency derivatives					$	2,036					$	2,036
Interest rate swap derivatives	Cash flow hedge	Level 2					Current liabilities	$	(81	)	$	(81	)

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


	Location	Year Ended December 31, 2014			Year Ended December 31, 2013
Foreign currency derivatives	Revaluation of derivatives	$	640			(1,327	)
	Product Revenues		(390	)		—
	Cost of Sales		(174	)		—
	Selling, general and administrative		(161	)		—
	Other Comprehensive Income		(10	)		—
	Foreign currency gain (loss)		(976	)		(761	)
Total foreign currency derivatives		$	(1,071	)	$	(2,088	)
CRS	Revaluation of derivatives	$	(1,157	)	$	2,335
Interest Rate derivatives	Revaluation of derivatives	$	(1	)	$	(2	)
	Other Comprehensive Income		81			143

The Company - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2014 USD ($)	Dec. 31, 2014 Segment
Nature Of Company [Line Items]
Number of reportable segments		2
Number of operating segments		3
North American Electronics Manufacturing Joint Venture
Nature Of Company [Line Items]
Gain realized from step acquisition of subsidiary \| $	$ 785

Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Line Items]
Maturity period of cash equivalents	90 days
Depreciation expense	$ 14,930	$ 14,810	$ 14,298
Share based compensation expense	8,601	3,103	823
Related deferred tax benefit	2,006	$ 1,887
Ownership percentage in Gentherm GmbH		100.00%
Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans
Accounting Policies [Line Items]
Share based compensation expense	8,601	$ 3,103	823
Related deferred tax benefit	2,949	419	301
Production tooling
Accounting Policies [Line Items]
Reimbursable tooling capitalized within prepaid expenses and other current assets	$ 2,298	1,691
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	$ 16,941	$ 17,570	$ 15,817
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 \| Lear Corporation
Accounting Policies [Line Items]
Percentage of accounts receivable balance	27.00%	24.00%
Concentration of Credit Risk \| Accounts receivable \| Magna International Inc.
Accounting Policies [Line Items]
Percentage of accounts receivable balance	5.00%	7.00%

Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Balance at beginning of year	$ 10,308	$ 8,588
Warranty claims paid or retired	(1,102)	(676)
Reversal of previously recorded liability	(3,744)
Expense	555	2,118
Adjustment due to currency translation	(796)	278
Balance at end of year	$ 5,221	$ 10,308

Reconciliation of Changes in Inventory Reserve (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Inventory [Line Items]
Balance at beginning of year	$ 2,933	$ 2,185	$ 1,127
Expense	2,204	779	1,307
Inventory write off	(154)	(6)	(215)
Adjustment due to currency translation	(181)	(25)	(34)
Balance at end of year	$ 4,802	$ 2,933	$ 2,185

Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Buildings \| Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years
Buildings \| 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
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	Estimated life of tool
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	Shorter of estimated life or 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	Shorter of useful life or term of lease

Roll Forward of Goodwill from Acquisition (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Goodwill	$ 25,809	$ 24,729
Exchange rate impact	(1,669)	1,080
Goodwill	30,398	$ 25,809
Goodwill arising from the acquisition of GPT	$ 6,258

Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2014
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, 2014 USD ($)
Amortization Expense [Line Items]
2015	$ 903
2016	903
2017	854
2018	706
2019	706
Patents
Amortization Expense [Line Items]
2015	15,848
2016	14,471
2017	14,471
2018	11,527
2019	10,121
Thereafter	$ 1,525

Gentherm Global Power Technologies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 30,398	$ 25,809	$ 24,729
Global Thermoelectric Inc
Business Acquisition [Line Items]
Product revenues	24,235
Operating Income	776
Net assets acquired	30,759
Cash acquired on acquisition	3,061
Goodwill	6,258
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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 30,398	$ 25,809	$ 24,729
Purchase price	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
Goodwill	6,258
Assumed liabilities	(6,530)
Net assets acquired	30,759
Cash acquired on acquisition	3,061
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, 2013
Finite Lived Intangible Assets [Line Items]
Gross Value	$ 121,885	$ 127,905
Accumulated Amortization	(53,756)	(44,474)
Net Value	68,129	$ 83,431
Global Thermoelectric Inc
Finite Lived Intangible Assets [Line Items]
Gross Value	9,406
Accumulated Amortization	(1,465)
Net Value	7,941
Global Thermoelectric Inc \| Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Value	5,264
Accumulated Amortization	(334)
Net Value	$ 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)
Net Value	$ 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)
Net Value	$ 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, 2014 USD ($)
Business Combinations [Abstract]
2015	$ 903
2016	903
2017	854
2018	706
2019	$ 706

Summary of Property and Equipment (Detail) $ in Thousands	12 Months Ended
Summary of Property and Equipment (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Buildings \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	5 years
Buildings \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	50 years
Global Thermoelectric Inc
Property Plant And Equipment [Line Items]
Property and equipment	$ 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

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

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Inventory:

Raw materials, net of reserve

$ 48,678

$ 33,783

Work in process, net of reserve

4,009

2,864

Finished goods, net of reserve

24,956

27,570

Total inventory

77,643

64,217

Property and equipment:

Buildings, plant and equipment

76,239

69,555

Automobiles

499

545

Production tooling

11,256

9,747

Leasehold improvements

7,331

6,986

Computer equipment and software

15,560

15,190

Construction in progress

8,063

2,854

Total property, plant and equipment, gross

118,948

104,877

Less: Accumulated depreciation

^[1]

(27,221)

(25,643)

Total property, plant and equipment, net

91,727

79,234

Other intangible assets:

Other intangible assets

121,885

127,905

Accumulated Amortization

(53,756)

(44,474)

Net Value

68,129

83,431

Accrued liabilities:

Tax accruals

15,696

7,944

Accrued warranty

5,221

10,308

$ 8,588

Accrued employee liabilities

19,783

17,081

Liabilities from discounts and rebates

8,429

5,485

Other accrued liabilities

19,258

25,965

Total accrued liabilities

68,387

66,783

Customer relationships

Other intangible assets:

Other intangible assets

77,026

81,008

Technology

Other intangible assets:

Other intangible assets

32,467

31,808

Product Development

Other intangible assets:

Other intangible assets

$ 12,392

$ 15,089

[1]	Includes accumulated amortization of capital lease obligations.

Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Derivative financial instruments	$ 2,461	$ 5,467
Net operating losses	7,075	3,599
Research and development credits	26,204	1,130
Depreciation	3,456	2,682
Valuation reserves and accrued liabilities	4,788	3,090
Foreign tax credit	823	222
Stock compensation	2,006	1,887
Inventory	1,443	739
Patents	138	722
Defined benefit obligation	1,479	662
Other credits	593	365
Capital lease obligations		273
Other	144	219
Deferred tax assets, gross	50,610	21,057
Valuation allowance	(18,037)	(2,199)
Deferred tax liabilities:
Intangible assets	(14,593)	(15,836)
Unrealized foreign currency exchange gains	(2,855)	(1,637)
Undistributed profits of subsidiary	(293)	(1,367)
Property and equipment	(162)	(193)
Other	(384)	(791)
Deferred tax liabilities, gross	(18,287)	(19,824)
Net deferred tax asset (liability)	$ 14,286	$ (966)

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011
Income Taxes [Line Items]
Statutory Federal income tax rate	34.00%	34.00%	34.00%
Deductions taken for tax purposes on stock option exercises	$ 1,831	$ 2,074
Stock option exercises included in net operating loss carryforwards	7,075	3,599
Tax benefit due to a change in tax law		1,300
Total unrecognized tax benefits	4,651	$ 2,241	$ 2,191		$ 1,678
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
Net operating loss additional amount utilizable				$ 4,044
U.S. Federal
Income Taxes [Line Items]
Stock option exercises included in net operating loss carryforwards	$ 21,856

Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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	(0.50%)	(1.70%)	4.50%
NOLs recognized upon change in tax law			(2.90%)
Foreign, state and local tax, net of Federal benefit	1.90%	3.60%	3.70%
Nondeductible expenses	1.80%	1.40%	1.60%
Stock option compensation	(0.10%)	(0.50%)
Research and development credits	(0.50%)	(2.30%)	(5.30%)
Effect of different tax rates of foreign jurisdictions	(10.00%)	(10.80%)	(10.50%)
Other tax exempt income	(0.90%)		(0.50%)
Other	(0.10%)	0.30%	1.00%
Effective rate	25.60%	24.00%	25.60%

Net Operating Loss Carryforwards (Detail) $ in Thousands	12 Months Ended
Net Operating Loss Carryforwards (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
U.S. Federal and state income tax
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 49,978
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	$ 4,090
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	2019
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 9,074
Operating loss carryforward, year of expiration	Indefinite

Earnings Before Income Taxes and Tax Provisions - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income before income taxes:
Domestic	$ 11,170	$ 6,891	$ 3,735
Foreign	83,051	39,339	28,937
Earnings before income tax	$ 94,221	$ 46,230	$ 32,672

Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax expense:
Federal	$ 4,005	$ 690	$ 511
State and local	(15)	495	(311)
Foreign	24,737	9,959	7,362
Total current income tax expense	28,727	11,144	7,562
Deferred income tax expense (benefit):
Federal	(576)	12	1,834
State and local	9	(95)	348
Foreign	(4,058)	36	(1,393)
Total deferred income tax expense	(4,625)	(47)	789
Total tax expense	$ 24,102	$ 11,097	$ 8,351

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 2,241	$ 2,191	$ 1,678
Additions based on tax position related to current year	43	2	67
Additions based on tax positions related to prior year	2,991	580	413
Reductions from settlements and statute of limitation expiration	(432)	(599)
Effect of foreign currency translation	(192)	67	33
Balance at end of year	$ 4,651	$ 2,241	$ 2,191

Debt - Additional Information (Detail) € in Thousands, $ in Thousands		12 Months Ended
	Aug. 07, 2014 USD ($)	Dec. 31, 2014 USD ($)	Aug. 07, 2014 EUR (€)
Debt Disclosure [Line Items]
Maximum percentage of stock of non US subsidiaries pledge to secure obligation	66.00%		66.00%
Debt retirement expense	$ 1,370
Financing costs incurred		$ 1,139
Deferred financing costs		$ 451
Credit facility maturity date		Aug. 07, 2019
Semi-annual principal payments earliest date		2015-03
Semi-annual principal payments latest date		2019-09
Revolving Credit Facility
Debt Disclosure [Line Items]
Secured long-term debt	100,000
Line of credit facility	50,000
US Term Note
Debt Disclosure [Line Items]
Secured term loan facility borrowing capacity	$ 50,000
Europe Term Loan
Debt Disclosure [Line Items]
Secured term loan facility borrowing capacity \| €			€ 20,000
Federal Funds Purchased \| Minimum
Debt Disclosure [Line Items]
Interest rate	0.06%
Federal Funds Purchased \| Maximum
Debt Disclosure [Line Items]
Interest rate	0.50%
US Bank of America credit facility \| Maximum
Debt Disclosure [Line Items]
Interest rate		3.25%
Eurocurrency Rate Loans
Debt Disclosure [Line Items]
Interest rate		1.75%
Eurocurrency Rate Loans \| Minimum
Debt Disclosure [Line Items]
Interest rate	1.00%	1.50%
Eurocurrency Rate Loans \| Maximum
Debt Disclosure [Line Items]
Interest rate		2.00%
Base Rate Loans
Debt Disclosure [Line Items]
Interest rate		0.75%
Base Rate Loans \| Minimum
Debt Disclosure [Line Items]
Interest rate		0.50%
Base Rate Loans \| Maximum
Debt Disclosure [Line Items]
Interest rate		1.00%

Amount borrowed under credit agreement (Detail) - Aug. 07, 2014 € in Thousands, $ in Thousands, $ in Thousands	USD ($)	EUR (€)	CAD ($)
US Term Note
Line Of Credit Facility [Line Items]
Borrowing proceeds	$ 50,000
US Revolving Note
Line Of Credit Facility [Line Items]
Borrowing proceeds	13,695		$ 15,000
Europe Term Loan
Line Of Credit Facility [Line Items]
Borrowing proceeds	$ 26,730	€ 20,000

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 90,775	$ 82,320
Current portion	(5,306)	(21,439)
Long-term debt, less current maturities	$ 85,469	$ 60,881
US Term Note
Debt Instrument [Line Items]
Interest Rate	2.00%
Total debt	$ 49,375
Europe Term Loan
Debt Instrument [Line Items]
Interest Rate	1.81%
Total debt	$ 23,963
US Revolving Note
Debt Instrument [Line Items]
Interest Rate	1.92%
Total debt	$ 12,000
DEG Loan
Debt Instrument [Line Items]
Interest Rate	4.25%	4.25%
Total debt	$ 4,805	$ 5,561
Capital Lease
Debt Instrument [Line Items]
Interest Rate	4.20%	4.20%
Total debt	$ 632	$ 2,440
US Term Note
Debt Instrument [Line Items]
Interest Rate		2.50%
Total debt		$ 24,500
Europe Term Note
Debt Instrument [Line Items]
Interest Rate		2.49%
Total debt		$ 38,899
W.E.T. Term Note
Debt Instrument [Line Items]
Interest Rate		2.01%
Total debt		$ 10,920

Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Debt maturing in 2015	$ 5,306
Debt maturing in 2016	5,138
Debt maturing in 2017	6,531
Debt maturing in 2018	6,996
Debt maturing in 2019	66,804
Total debt	90,775	$ 82,320
US Term Note
Debt Instrument [Line Items]
Debt maturing in 2015	2,500
Debt maturing in 2016	2,812
Debt maturing in 2017	3,750
Debt maturing in 2018	4,063
Debt maturing in 2019	36,250
Total debt	49,375
Europe Term Loan
Debt Instrument [Line Items]
Debt maturing in 2015	1,213
Debt maturing in 2016	1,365
Debt maturing in 2017	1,820
Debt maturing in 2018	1,972
Debt maturing in 2019	17,593
Total debt	23,963
US Revolving Note
Debt Instrument [Line Items]
Debt maturing in 2019	12,000
Total debt	12,000
DEG Loan
Debt Instrument [Line Items]
Debt maturing in 2015	961
Debt maturing in 2016	961
Debt maturing in 2017	961
Debt maturing in 2018	961
Debt maturing in 2019	961
Total debt	4,805	5,561
Capital Lease
Debt Instrument [Line Items]
Debt maturing in 2015	632
Total debt	$ 632	$ 2,440

Accounting for Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 16, 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	$ 9,414	$ 10,613
Unrecognized share-based compensation cost recognition period	2 years
Share based compensation expense	$ 8,601	$ 3,103	$ 823
Weighted average grant date fair value of options granted	$ 7.88	$ 4.71	$ 4.13
Total intrinsic value of options exercised	$ 21,249	$ 8,301	$ 1,663
Total fair value of shares vested	$ 5,329	$ 2,076	$ 210
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period				1 year
Employee \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period				3 years
Employee \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period				5 years
Equity Incentive Plan Two Thousand Thirteen
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	2,188,000				3,500,000
Equity Incentive Plan Twenty Eleven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	2,315,578
May Sixteen Twenty Thirteen and Thereafter \| 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

Summarizes Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, beginning balance, shares	1,943,176	2,129,929	2,163,825
Granted, shares	605,000	510,000	160,000
Exercised, shares	(731,142)	(672,753)	(176,896)
Forfeited, shares	(132,500)	(24,000)	(17,000)
Stock options outstanding, ending balance, shares	1,684,534	1,943,176	2,129,929
Stock options exercisable, shares	632,034	1,055,176	1,520,720
Stock options outstanding, beginning balance, weighted average exercise price	$ 12.19	$ 8.82	$ 8.12
Granted, weighted average exercise price	30.15	19.64	12.88
Exercised, weighted average exercise price	9.84	7.21	4.46
Forfeited, weighted average exercise price	19.30	11.27	4.05
Stock options outstanding, ending balance, weighted average exercise price	19.11	12.19	8.82
Exercisable, weighted average exercise price	$ 10.13	$ 12.21	$ 7.57
Stock options outstanding, weighted-average remaining contractual term	5 years 1 month 6 days	5 years 3 months 22 days	6 years 11 months 27 days
Exercisable, weighted-average remaining contractual term	3 years 11 months 19 days	4 years 6 months 29 days	6 years 2 months 12 days
Stock options outstanding, aggregate intrinsic value	$ 30,111	$ 28,379	$ 5,640
Exercisable, aggregate intrinsic value	$ 16,744	$ 19,314	$ 5,966

Fair Value of Option on date of grant (Detail)	12 Months Ended
Fair Value of Option on date of grant (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	37.00%	34.00%	47.00%
Weighted average expected volatility	37.00%	34.00%	47.00%
Expected lives	3 years	3 years	3 years
Risk-free interest rate			0.43%
Expected dividend yield
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	0.60%	0.57%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	1.00%	0.65%

Summarizes Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Nonvested at beginning of period, Shares	243,967	162,258	24,900
Granted, Shares	104,584	183,967	155,280
Vested, Shares	(129,092)	(102,258)	(17,922)
Forfeited, Shares	(42,375)
Nonvested at end of period, Shares	177,084	243,967	162,258
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value	$ 17.43	$ 13.23	$ 16.69
Granted, Weighted-Average Grant Date Fair Value	27.79	18.78	12.94
Vested, Weighted-Average Grant Date Fair Value	16.45	13.59	15.54
Forfeited, Weighted-Average Grant Date Fair Value	19.77
Nonvested at end of period, Weighted-Average Grant Date Fair Value	$ 23.70	$ 17.43	$ 13.23

Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding, beginning balance, shares	1,943,176	2,129,929	2,163,825
Granted, shares	605,000	510,000	160,000
Exercised, shares	(731,142)	(672,753)	(176,896)
Forfeited, shares	(132,500)	(24,000)	(17,000)
Stock options outstanding, ending balance, shares	1,684,534	1,943,176	2,129,929
Exercisable, Ending Balance	632,034	1,055,176	1,520,720
Stock options outstanding, beginning balance, weighted average exercise price	$ 12.19	$ 8.82	$ 8.12
Granted, weighted average exercise price	30.15	19.64	12.88
Exercised, weighted average exercise price	9.84	7.21	4.46
Forfeited, weighted average exercise price	19.30	11.27	4.05
Stock options outstanding, ending balance, weighted average exercise price	19.11	12.19	8.82
Exercisable, Weighted Average Exercise Price	$ 10.13	$ 12.21	$ 7.57
Stock options outstanding, weighted-average remaining contractual term	5 years 1 month 6 days	5 years 3 months 22 days	6 years 11 months 27 days
Exercisable, weighted-average remaining contractual term	3 years 11 months 19 days	4 years 6 months 29 days	6 years 2 months 12 days
Outstanding, aggregate intrinsic value	$ 30,111	$ 28,379	$ 5,640
Exercisable, aggregate intrinsic value	$ 16,744	$ 19,314	$ 5,966
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options outstanding, beginning balance, shares	495,000
Granted, shares	754,000	495,000
Exercised, shares	(68,750)
Forfeited, shares	(120,000)
Stock options outstanding, ending balance, shares	1,060,250	495,000
Exercisable, Ending Balance	35,000
Stock options outstanding, beginning balance, weighted average exercise price	$ 19.19
Granted, weighted average exercise price	34.70	$ 19.19
Exercised, weighted average exercise price	19.10
Forfeited, weighted average exercise price	21.46
Stock options outstanding, ending balance, weighted average exercise price	29.97	$ 19.19
Exercisable, Weighted Average Exercise Price	$ 19.43
Stock options outstanding, weighted-average remaining contractual term	6 years 1 month 10 days	6 years 6 months
Exercisable, weighted-average remaining contractual term	5 years 6 months 11 days
Outstanding, aggregate intrinsic value	$ 9,991	$ 3,770
Exercisable, aggregate intrinsic value	$ 602

Earnings per Share (Detail) - shares	12 Months Ended
Earnings per Share (Detail) - shares	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	35,411,608	33,652,646	28,352,864
Stock options under the 1997, 2006, 2011 and 2013 equity plans	637,723	470,995	509,599
Weighted average number of shares for calculation of diluted EPS – Common Stock	36,049,331	34,123,641	28,862,463
Common stock that have been excluded from the diluted shares calculation	155,000	550,000	1,680,891
Stock options outstanding for the 1997, 2006, 2011 and 2013 equity plans
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation	155,000	550,000	149,000
Series C Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation			1,531,891

Future Minimum Lease Payments (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2015	$ 6,932
2016	4,906
2017	2,008
2018	845
2019	797
2020 or later	219
Total	$ 15,707

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Rent expense under company's operating leases	$ 6,331	$ 5,992	$ 5,996

Shareholder Rights Plan - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of shares of preferred stock authorized	4,991,000
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, 2014 USD ($) Customer	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Segment Reporting Information [Line Items]
Goodwill	$ 30,398	$ 25,809	$ 24,729
Reimbursed research and development costs	8,885	2,324	2,239
Selling, general and administrative costs	84,647	72,091	64,321
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	$ 24,140
Industrial Segments
Segment Reporting Information [Line Items]
Goodwill	6,258
Reimbursed research and development costs	8,885	2,324	2,239
Selling, general and administrative costs	36,214	32,597	$ 30,087
Acquisition transaction expenses	$ 1,075	$ 2,414

Segment Information about Reported Product Revenues and Operating Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Product revenues	$ 811,300	$ 662,082	$ 554,979
Depreciation and amortization	35,029	31,249	30,627
Operating income (loss)	98,434	50,384	36,656
W.E.T
Segment Reporting Information [Line Items]
Product revenues	787,065	662,082	554,979
Depreciation and amortization	30,016	28,439	29,188
Operating income (loss)	144,645	91,255	71,995
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	24,235
Depreciation and amortization	2,114	323	247
Operating income (loss)	(8,922)	(5,860)	(5,252)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	2,899	2,487	1,192
Operating income (loss)	$ (37,289)	$ (35,011)	$ (30,087)

Segment Reporting (Detail) - USD ($) $ in Thousands	12 Months Ended
Segment Reporting (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Product revenues	$ 811,300	$ 662,082	$ 554,979
Total product revenues in percentage	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Product revenues	$ 361,706	$ 292,079	$ 233,737
Total product revenues in percentage	45.00%	44.00%	42.00%
Germany
Segment Reporting Information [Line Items]
Product revenues	$ 90,243	$ 84,035	$ 67,132
Total product revenues in percentage	11.00%	13.00%	12.00%
Korea
Segment Reporting Information [Line Items]
Product revenues	$ 89,515	$ 58,329	$ 42,878
Total product revenues in percentage	11.00%	9.00%	8.00%
China
Segment Reporting Information [Line Items]
Product revenues	$ 69,910	$ 70,671	$ 55,674
Total product revenues in percentage	9.00%	11.00%	10.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 47,528	$ 39,844	$ 35,279
Total product revenues in percentage	6.00%	6.00%	6.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 25,738	$ 17,247	$ 15,361
Total product revenues in percentage	3.00%	3.00%	3.00%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	$ 24,712	$ 18,864	$ 13,194
Total product revenues in percentage	3.00%	3.00%	2.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 20,293	$ 14,254	$ 17,582
Total product revenues in percentage	2.00%	2.00%	3.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	$ 19,590	$ 15,670	$ 14,988
Total product revenues in percentage	2.00%	2.00%	3.00%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 62,065	$ 51,089	$ 59,154
Total product revenues in percentage	8.00%	7.00%	11.00%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 449,594	$ 370,003	$ 321,242
Total product revenues in percentage	56.00%	56.00%	58.00%

Percentage of Total Product Revenues Generated from Customers (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Johnson Controls Inc.
Segment Reporting Information [Line Items]
Percentage of total product revenues generated from customer	24.00%	27.00%	22.00%
Lear Corporation
Segment Reporting Information [Line Items]
Percentage of total product revenues generated from customer	21.00%	18.00%	18.00%
Bosch
Segment Reporting Information [Line Items]
Percentage of total product revenues generated from customer	9.00%	10.00%	10.00%

Executive Nonqualified Defined Benefit Plan - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($) Payment	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Vesting period	6 years
Discount rate for benefit obligation and net periodic service cost	3.25%	4.25%	3.25%
Insurance policy value	$ 2,056	$ 1,962
Contributions to 401(k) plan	543	191	$ 161
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Underfunded defined benefit plan	4,505	$ 3,679
Chief Executive Officer
Defined Benefit Plan Disclosure [Line Items]
Annual retirement payment	$ 300,000
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, 2014	Dec. 31, 2013
Change in projected benefit obligation:
Benefit obligation at beginning of year	$ 1,848	$ 1,633
Service cost	335	355
Interest cost	78	53
Actuarial (gains)/losses	213	(193)
Net periodic benefit cost	626	215
Benefit obligation at end of year	2,474	1,848
Gentherm GmbH
Change in projected benefit obligation:
Benefit obligation at beginning of year	6,019	5,392
Service cost	304
Interest cost	181	180
Paid pension distributions	(278)	(291)
Actuarial (gains)/losses	1,385	43
Past service cost	1,271	445
Exchange rate impact	(762)	250
Benefit obligation at end of year	$ 8,120	$ 6,019

Fair Value of Plan Assets (Detail) - Gentherm GmbH - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Change in plan assets:
Plan assets at beginning of year	$ 2,340	$ 1,548
Actual return on plan assets	89	59
Net contributions	958	664
Actuarial gains/(losses)	531	(24)
Exchange rate impact	(303)	93
Plan assets at end of year	$ 3,615	$ 2,340

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

Schedule of Expected Pension Payments (Detail) - Gentherm GmbH $ in Thousands	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2015	$ 276
2016	277
2017	276
2018	275
2019	274
2020 - 2024	1,360
Total	$ 2,738

Fair Value Measurement - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Financial assets, fair value	$ 0	$ 0
Financial liabilities, fair value	0	0
Changes to fair value of assets, realized	$ 0	$ 0

Derivative Financial Instruments - Additional Information (Detail) € in Thousands, $ in Thousands		1 Months Ended	12 Months Ended
	Mar. 25, 2013 EUR (€)	Mar. 31, 2008	Dec. 31, 2014 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 EUR (€)
Interest Rate Swap
Derivative Instruments [Line Items]
Hedge Ineffectiveness Incurred \| $			$ 0		$ 0
W.E.T
Derivative Instruments [Line Items]
Variable Rate			six month EURIBOR	six month EURIBOR
Fixed interest rate			0.17%			0.17%
Basis spread on variable rate			1.40%			1.40%
Exchange rate			1.20			1.20
Derivative exchange rate			1.46			1.46
W.E.T \| Interest Rate Swap
Derivative Instruments [Line Items]
Derivative maturity period		10 years
Notional Value			$ 12,133			€ 10,000
Unicredit Bank
Derivative Instruments [Line Items]
Legal settlement for CRS \| €	€ 144
Costs of all future obligations under CRS			9,164	€ 7,553
Past due payments under CRS			$ 8,670	€ 7,146

Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Foreign Currency Derivatives \| Not a hedge
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Asset Derivatives, Fair Value, Total	$ 1,490	$ 2,036
Net Asset/(Liabilities)	1,490	2,036
Foreign Currency Derivatives \| Not a hedge \| Current Assets
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Asset Derivatives, Fair Value, Total	145
Net Asset/(Liabilities)	145
Foreign Currency Derivatives \| Not a hedge \| Current Assets \| Contract One
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Asset Derivatives, Fair Value, Total		1
Net Asset/(Liabilities)		1
Foreign Currency Derivatives \| Not a hedge \| Current Assets \| Contract Two
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Asset Derivatives, Fair Value, Total		66
Net Asset/(Liabilities)		66
Foreign Currency Derivatives \| Not a hedge \| Noncurrent Assets
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Asset Derivatives, Fair Value, Total	1,345	1,969
Net Asset/(Liabilities)	1,345	1,969
Currency Related Swap
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Net Asset/(Liabilities)		(11,829)
Currency Related Swap \| Not a hedge
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Liability Derivatives, Fair value	(9,164)	(11,829)
Net Asset/(Liabilities)	(9,164)
Currency Related Swap \| Not a hedge \| Current Liabilities
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Liability Derivatives, Fair value	(2,466)	(2,471)
Currency Related Swap \| Not a hedge \| Noncurrent Liabilities
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Liability Derivatives, Fair value	$ (6,698)	(9,358)
Interest Rate Swap \| Designated as Hedging Instrument \| Current Liabilities
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Liability Derivatives, Fair value		(81)
Net Asset/(Liabilities)		$ (81)

Information Related to Effect of Derivative Instruments on Our Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (1,071)	$ (2,088)
Other Comprehensive Income (Loss)
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	81	143
Other Comprehensive Income (Loss) \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(10)
Revaluation of derivatives \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	640	(1,327)
Revaluation of derivatives \| Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(1,157)	2,335
Revaluation of derivatives \| Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(1)	(2)
Product Revenues \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(390)
Cost of Sales \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(174)
Selling, General and Administrative Expense \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(161)
Foreign Currency Gain (Loss) \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (976)	$ (761)

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1,807	$ 2,474	$ 1,937
Charged to Costs and Expenses	2,043	1,723	529
Charged to Other Accounts	(105)	(8)	4
Inventory write off	(898)	(2,382)	4
Balance at end of year	2,847	1,807	2,474
Valuation Allowance of Deferred Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	2,199	2,199	3,702
Charged to Other Accounts	16,674		(1,503)
Inventory write off	(836)
Balance at end of year	18,037	2,199	2,199
Inventory Valuation Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	2,933	2,185	1,127
Charged to Costs and Expenses	2,204	779	1,307
Charged to Other Accounts	(181)	(25)	(34)
Inventory write off	(154)	(6)	(215)
Balance at end of year	$ 4,802	$ 2,933	$ 2,185