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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	THRM
Entity Registrant Name	GENTHERM INC
Entity Central Index Key	0000903129
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		36,793,513

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 70,482	$ 103,172
Accounts receivable, less allowance of $1,024 and $973, respectively	196,616	185,058
Inventory:
Raw materials	64,871	64,175
Work in process	13,807	16,139
Finished goods	41,959	41,095
Inventory, net	120,637	121,409
Derivative financial instruments	1,168	213
Prepaid expenses and other assets	56,848	51,217
Total current assets	445,751	461,069
Property and equipment, net	205,232	200,294
Goodwill	70,439	69,685
Other intangible assets, net	80,809	83,286
Deferred financing costs	875	936
Deferred income tax assets	84,946	30,152
Other non-current assets	13,371	37,983
Total assets	901,423	883,405
Current Liabilities:
Accounts payable	88,087	89,596
Accrued liabilities	72,908	77,209
Current maturities of long-term debt	3,485	3,460
Derivative financial instruments	1	1,050
Total current liabilities	164,481	171,315
Pension benefit obligation	7,965	7,913
Other liabilities	6,759	2,747
Long-term debt, less current maturities	105,742	141,209
Deferred income tax liabilities	6,028	6,347
Total liabilities	290,975	329,531
Common Stock:
No par value; 55,000,000 shares authorized, 36,794,573 and 36,761,362 issued and outstanding at March 31, 2018 and December 31, 2017, respectively	266,812	265,048
Paid-in capital	16,155	15,625
Accumulated other comprehensive loss	(7,551)	(20,444)
Accumulated earnings	335,032	293,645
Total shareholders’ equity	610,448	553,874
Total liabilities and shareholders’ equity	$ 901,423	$ 883,405

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 1,024	$ 973
Common Stock, par value
Common Stock, shares authorized	55,000,000	55,000,000
Common Stock, shares issued	36,794,573	36,761,362
Common Stock, shares outstanding	36,794,573	36,761,362

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Product revenues	$ 261,889	$ 249,267
Cost of sales	183,322	164,107
Gross margin	78,567	85,160
Operating expenses:
Net research and development expenses	23,304	19,505
Selling, general and administrative expenses	34,592	30,806
Total operating expenses	57,896	50,311
Operating income	20,671	34,849
Interest expense	(1,180)	(1,122)
Foreign currency loss	(4,578)	(1,329)
Other income	1,089	236
Earnings before income tax	16,002	32,634
Income tax expense	3,036	7,232
Net income	$ 12,966	$ 25,402
Basic earnings per share	$ 0.35	$ 0.69
Diluted earnings per share	$ 0.35	$ 0.69
Weighted average number of shares – basic	36,766,411	36,619,825
Weighted average number of shares – diluted	36,873,407	36,739,282

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,966	$ 25,402
Other comprehensive income (loss), gross of tax:
Foreign currency translation adjustments gain	11,741	5,515
Unrealized gain on foreign currency derivative securities	2,112	2,960
Unrealized (loss) gain on commodity derivative securities	(218)	32
Other comprehensive income, gross of tax	13,635	8,507
Other comprehensive income (loss), related tax effect:
Cumulative effect of accounting change due to ASU 2018-02	(40)
Foreign currency translation adjustments gain	(76)	(3)
Unrealized gain on foreign currency derivative securities	(567)	(795)
Unrealized (loss) gain on commodity derivative securities	(59)	(11)
Other comprehensive income (loss), related tax effect	(742)	(809)
Other comprehensive income, net of tax	12,893	7,698
Comprehensive income	$ 25,859	$ 33,100

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net income	$ 12,966	$ 25,402
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	12,892	10,192
Deferred income taxes	(707)	676
Stock compensation	2,202	2,303
Defined benefit plan expense	298	(16)
Provision of doubtful accounts	41	(54)
Loss on sale of property and equipment	85	103
Changes in operating assets and liabilities:
Accounts receivable	(9,691)	(13,900)
Inventory	1,903	(2,407)
Prepaid expenses and other assets	(4,881)	(6,492)
Accounts payable	1,290	1,094
Accrued liabilities	(10,808)	(38,237)
Net cash provided by (used in) operating activities	5,590	(21,336)
Investing Activities:
Final payment for acquisition of subsidiary, net of cash acquired	(15)	(2,000)
Purchases of property and equipment	(8,378)	(13,552)
Net cash used in investing activities	(8,393)	(15,552)
Financing Activities:
Repayments of debt	(35,492)	(8,427)
Cash paid for the cancellation of restricted stock	(659)	(926)
Proceeds from the exercise of Common Stock options	751	881
Net cash used in financing activities	(35,400)	(8,472)
Foreign currency effect	5,513	2,080
Net decrease in cash and cash equivalents	(32,690)	(43,280)
Cash and cash equivalents at beginning of period	103,172	177,187
Cash and cash equivalents at end of period	70,482	133,907
Supplemental disclosure of cash flow information:
Cash paid for taxes	6,870	51,618
Cash paid for interest	981	858
Supplemental disclosure of non-cash transactions:
Common Stock issued to Board of Directors and employees	$ 1,362	$ 1,125

The Company and Subsequent Events	3 Months Ended
The Company and Subsequent Events	Mar. 31, 2018
Company And Subsequent Events [Abstract]
The Company and Subsequent Events	Note 1 – The Company and Subsequent Events 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 provide solutions for automotive passenger comfort and convenience, battery thermal management, remote power generation, patient temperature management, environmental product testing and other consumer and industrial temperature control needs. Our automotive products can be found on the vehicles of nearly all major automotive manufacturers operating in North America, Europe and Asia. We operate in locations aligned with our major customers’ product strategies 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 and new applications from existing technologies to create product and market opportunities for a wide array of thermal management solutions. U.S. Tax Reform The Tax Cuts and Jobs Act (the “Tax Act”) was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on all offshore earnings that were previously tax deferred and creates new taxes on certain foreign sourced earnings. As of December 31, 2017, and in accordance with guidance provided by Staff Accounting Bulletin No. 118 (SAB 118), the Company had not completed its accounting for the tax effects of the Tax Act; however, in certain cases, as described below the Company made a provisional estimate of the effects on our existing deferred tax balances and the one-time transition tax. For the year ended December 31, 2017, the provision for income taxes includes a provisional income tax expense of $20,153 related to items for which the Company was able to determine a reasonable estimate. For the three-month period ended March 31, 2018, there have been no changes to the provisional income tax expenses booked in 2017. In all cases, we will continue to make and refine our calculations as additional analysis is completed. In addition, the Company’s estimates may be affected as additional regulatory guidance is issued with respect to the Tax Act. Any adjustments to the provisional amounts will be recognized as a component of the provision for income taxes in the period in which such adjustments are determined, but in any event, no later than the fourth quarter of 2018, in accordance with SAB 118. Deferred tax assets and liabilities The Company remeasured its U.S. deferred tax assets and liabilities at 21%. However, the Company is still analyzing certain aspects of the Tax Act and refining the calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. In the year ended December 31, 2017, the provision for income taxes included provisional income tax expense of $5,808 related to the remeasurement of deferred tax balances. For the three-month period ended March 31, 2018, there have been no changes to the provisional income tax expenses in 2017. Transition Tax on Deferred Foreign Earnings The one-time transition tax is based on the Company’s post-1986 earnings and profits (“E&P”) that were previously deferred from U.S. income taxes. In the year ended December 31, 2017, the provision for income taxes included provisional income tax expense of $23,923 related to the one-time transition tax liability of the Company’s foreign subsidiaries. The Company has not completed its calculation of the total post-1986 E&P for these foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when the Company finalizes the calculation of post-1986 E&P previously deferred from U.S. income taxes and the amounts held in cash or other specified assets. For the three-month period ended March 31, 2018, there have been no changes to the provisional income tax expenses booked in 2017. A benefit of $9,578 was included in the provision for income taxes for the year-ended December 31, 2017 to offset the one-time transition tax related to the previous deferred tax liability that existed for the undistributed foreign earnings that were not permanently reinvested. For the three-month period ended March 31, 2018, there have been no changes to the provisional income tax benefit booked in 2017 related to this item. However, we continue to recognize a deferred tax liability related to foreign withholding tax that will be incurred for undistributed foreign earnings that are not permanently reinvested. Note 1 – The Company and Subsequent Events – Continued Subsequent Events We have evaluated subsequent events through the date that our consolidated condensed financial statements are issued. No events have taken place that meet the definition of a subsequent event requiring adjustments to or disclosures in this Form 10-Q.

Basis of Presentation and New Accounting Pronouncements

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation and New Accounting Pronouncements

Note 2 – Basis of Presentation and New Accounting Pronouncements

Accounting Principles

Our unaudited consolidated condensed financial statements and accompanying notes have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in the audited annual consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States of America have been condensed or omitted pursuant to those rules and regulations. In the opinion of management, all adjustments, consisting of normal recurring items, considered necessary for a fair presentation of our results of operations, financial position and cash flows have been included. The balance sheet as of December 31, 2017 was derived from audited annual consolidated financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. Operating results for the three-month period ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These consolidated condensed financial statements should be read in conjunction with the financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017.

Consolidation

The consolidated financial statements at March 31, 2018 and December 31, 2017 and for the three-month period ended March 31, 2018 and 2017, reflect the consolidated financial position and consolidated operating results of the Company. Investments in affiliates in which Gentherm would not have control, but would have the ability to exercise significant influence over operating and financial policies, would be accounted for under the equity method. Investment for which Gentherm is not able to exercise significant influence over the investee and which do not have readily determinable fair values are accounted for under the cost method. Intercompany accounts have been eliminated in consolidation.

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, liabilities, revenues and expenses. Actual results could differ from those estimates and assumptions.

Revenue Recognition

Revenue is recognized from agreements containing enforceable rights and obligations when promised goods are delivered or services are completed, the price is fixed or determinable, and payment has been received or is collectable. The amount of revenue recognized is net of the Company’s obligation for returns, rebates, discounts, taxes, if any, collected from customers, and consideration that is paid to a customer, unless such payment is in exchange for a distinct good or service. The amount of revenue recognized from a contract with a customer reflects the amount of consideration expected to be received in exchange for the transfer of good or services.

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Automotive Revenues

The Company sells automotive seat comfort systems, specialized automotive cable systems and automotive thermal convenience products under long-term supply agreements (“LTAs”) and, for arrangements that are less than one year in length, purchase orders. LTAs are multiple-year business awards to provide custom designed parts for a particular automotive vehicle program in quantities and at intervals of the customer’s choosing. LTAs are often multiple-element agreements. The main element in LTAs are production parts; distinct promises from which the customer can benefit separately from other promises or elements in the contract. A second element in LTAs are production part purchase options that provide customers the ability to purchase additional parts at set prices in the future. Judgement is used to determine whether a production part purchase option represents a material right to the customer and should be accounted for as a separate performance obligation. LTAs that provide customers with a purchase option discount incrementally higher than the range discounts typically given to automotive customers contain a material right. The magnitude of change in the year-over-year option prices and the total number of units expected to be ordered are important factors in the calculation of the option’s fair value and the allocation of transaction price.

The price for parts is set at the point in time the customer exercises its option to purchase additional parts from the Company. A firm order, stating the number of each production part to be delivered, is an independent contract with a discrete transaction price. Revenues are allocated to production parts based on the relative standalone selling prices observed on the LTAs. As a practical alternative to estimating the standalone selling price of an option that provides a customer with a material right, the Company allocates transaction price to options by reference to the production part volumes expected to be ordered and the consideration expected to be received. The Company satisfies its obligation to provide product parts to the customer upon shipment.

When an option to purchase additional production parts in the future represents a material right, the customer effectively is paying Gentherm in advance for production parts each time it exercises the option by placing a firm order commitment. Revenue from options containing a material right are recognized on the basis of direct measurement of the value of production parts transferred to date relative to the total number of production parts expected to be delivered over the life of the vehicle program. Judgement is required to determine the pattern and timing with which an option containing a material right is satisfied and the production part is transferred to a customer.

Industrial Revenues

Our industrial business unit generates revenue from the sale of products and services by our wholly-owned subsidiaries Cincinnati Sub-Zero (“CSZ”) and Gentherm Global Power Technologies (“GPT”). Industrial business unit revenues and medical business unit revenues discussed below are reported within the Company’s industrial reportable segment (see Note 5). Industrial business unit customers commonly enter into multiple-element agreements for the purchase of products and services. Installation services, for example, are separate and distinct performance obligations that are often included in contracts to purchase customized environmental test chambers. Depending on the application, delivery of an environmental test chamber or remote power generation system to the customer’s place of business can range from two weeks to nine months from commencement of the contract. Installation services, while reliant on the specifications and timing from the customer, rarely remain incomplete more than two months after delivery.

Revenues allocated to environmental test chambers or remote power systems are based on the stand alone selling price of products themselves. Judgement is used to determine the degree to which early pay discounts and other credits are utilized in the calculation of standalone selling price, and only included to the extent it is probable that a significant reversal of any incremental revenue will not occur. Revenues are recognized at the point in time the chamber or power system is shipped to the customer. For contracts that also include a promise for installation, the portion of total transaction price allocated to the installation is recognized as revenue at the point in time the installation is complete.

Revenues from our medical business unit are generated from the sale of products and equipment. Our medical product and equipment focus on body and blood temperature management. The Company sells medical products and equipment primarily through distributor and group purchasing organization agreements. These agreements allow member participants to the distributor or group purchasing organization to make purchases at discounted prices negotiated by the distributor or group purchasing organization. A rebate is incurred at the point in time a member participant purchases product covered under these types of agreements. Rebates are accounted for as variable consideration, using an expected value, probability weighted approach, based on the level of sales to the distributor and the time lag between the initial sale and the rebate claim in determining the transaction price of a contract. Revenue is recognized at the point in time the medical products or equipment is transferred to the customer.

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Contract Balances

We record a receivable when revenue is recognized at the time of invoicing and unearned revenue when revenue is recognized subsequent to invoicing. For contracts where control of the goods or service is transferred to the customer over time, or whose terms require the customer to make milestone payments throughout the fulfillment period, the timing of revenue recognition is likely to differ from the timing of invoicing to customers.

The opening balance of our accounts receivable, net of allowance for doubtful accounts, was $185,058 as of January 1, 2018.

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

Activity in the allowance for doubtful accounts was as follows:

Three Months Ended March 31, 2018
Balance, beginning of period	$	973
Additions charged to costs		287
Recoveries recognized in costs		(245	)
Write-offs	$	9
Balance, end of period	$	1,024

Most of Gentherm’s unearned revenue pertains to LTAs containing a material right. In the early periods of an LTA containing a material right, when payments collected from the customer are greater than the standalone selling price of the production parts, revenue associated with the material right is deferred. In future periods, when amounts collected from customers as payment is less than the standalone selling price of the production parts delivered, the deferred revenue is reversed into revenue. For LTAs containing a material right and, thus, the timing of revenue recognition is likely to differ from the timing of invoicing to customer, the aggregate amount of transaction price allocated to material rights that remain unsatisfied as of March 31, 2018 is $3,426. We expect to recognize into revenue, 55% of this balance in the next 12 months, and the remaining 29%, 10%, 5% and 1% in 2019, 2020, 2021 and 2022, respectively.

Gentherm often requires milestone payments for contracts to provide environmental test chambers or remote power systems to customers. Milestone payments do not provide the Company with a right to payment for the work completed to date and do not represent the satisfaction of a performance obligation. Milestone payments are deferred and reported within unearned revenue until construction is complete and the unit has been delivered or is installed. If the environmental test chamber contract includes a separate promise to provide installation services, any installation-related payments received from the customer are deferred until the point in time the installation is complete.

The total amount of unearned revenue associated with environmental chamber and remote power system contracts, including environmental chamber contracts that include a separate obligation to provide installation, as of March 31, 2018 is $3,374. This entire balance is expected to be recognized into revenue during the next 12 months.

See Note 10 for information regarding the unearned revenue associated with these arrangements, including unearned revenue by segment and amounts recognized into revenue during the most recent three-month period ending March 31, 2018.

Payment terms for contracts with customers generally range from 30 to 120 days from the date of shipment of goods or completion of service or, if applicable, the scheduled milestone payment due date, and do not include components designed to provide customers with financing.

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Assets Recognized from the Costs to Obtain a Contract with a Customer

We recognize an asset for the incremental costs of obtaining a contract with a customer if the benefits of those costs are expected to be realized for a period greater than one year. Total capitalized costs to obtain a contract were immaterial during the periods presented and are included in prepaid expenses and other assets and other non-current assets.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” ASU 2014-09 was developed to enable financial statement users a 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 good or services. Issuers are to use a five-step contract review model to ensure revenue is measured, recognized, and disclosed in accordance with this principle. The FASB has issued several amendments to the update, including a one-year deferral of the original effective date, and new methods for identifying performance obligations that are intended to reduce the cost and complexity of compliance.

We have adopted ASU 2014-09 and related amendments effective January 1, 2018 using the cumulative catch-up transition method, which required us to disclose the cumulative effect of initially applying the update recognized at the date of initial application. We elected to apply the guidance in ASU 2014-09 to contracts that were not completed at January 1, 2018.

The most significant impact from adoption of ASU 2014-09 occurred within our Automotive segment and relates to our accounting for production part purchase options that grant customers a material right to purchase additional parts under long-term supply agreements in the future. Due to the complexity of certain of our automotive supply contracts, the actual revenue recognition treatment for customer purchase options will depend on contract-specific terms and could vary from other contracts that are similar in nature. Revenue recognition related to goods and services reported in the Industrial segment remains substantially unchanged.

The amount by which each financial statement line item was affected by application of ASU 2014-09 and related amendments during the three-month period ended March 31, 2018 is as follows:

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
Three Months Ended March 31, 2018
Product revenues	$	261,209	$	680		$	261,889
Income tax expense		3,177		(141	)		3,036
Net income		12,427		539			12,966
Basic earnings per share		0.34		0.01			0.35
Diluted earnings per share		0.34		0.01			0.35

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
March 31, 2018
Balance Sheet
Accounts receivable, net of allowance for doubtful accounts	$	196,616	$	—		$	196,616
Accrued liabilities	$	69,482	$	3,426		$	72,908
Unearned Revenue	$	3,374	$	3,426		$	6,800
Deferred income taxes, net	$	78,218	$	700		$	78,918
Accumulated earnings	$	337,758	$	(2,726	)	$	335,032

Adoption of ASU 2014-09 and related amendments had no impact to cash from or used in operating, investing or financing activities on our consolidated condensed statements of cash flows.

Statement of Cash Flows

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 provides guidance on the classification of eight specific cash receipt and cash payment transactions in the statement of cash flows. The Company focused its evaluation on the following transactions to determine the effect ASU 2016-15 will have on the Company’s Consolidated Statements of Cash Flows:

Debt extinguishment payments and debt prepayments are to be shown as cash outflows for financing activities. Presently, Gentherm classifies debt extinguishment payments within operating activities.

Payments made to settle contingent consideration liabilities not made soon after the acquisition date of a business combination should be recognized as cash outflows for financing activities up to the amount of the liability recognized at the acquisition date. Payments, or the portion of a payment, to settle contingent consideration liabilities that exceed the amount of the liability recognized at the acquisition date will be recognized as cash outflows for operating activities.

Cash receipts from the settlement of insurance claims, excluding those related to corporate-owned life insurance policies shall be classified on the basis of the related insurance coverage. For example, proceeds received to cover claims issued under product recall liability insurance would be classified as cash inflows from operating activities.

Cash receipts from the settlement of corporate-owned life insurance policies shall be classified as cash inflows from investing activities.

We have adopted ASU 2016-15 and related amendments effective January 1, 2018. None of the cash receipt and cash payment transactions addressed by the update, including those that were not the focus of management’s evaluation, occurred during any of the periods presented in this report. Adoption of this update and related amendments did not have a material impact on the cash flows of the Company.

Income Taxes

In October 2016, the FASB issued ASU 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.” ASU 2016-16 modifies the current prohibition to recognize deferred income taxes from differences between the tax basis of assets in the buyer’s tax jurisdiction and their cost resulting from an intra-entity transfer from one tax-paying component to another tax-paying component of the same consolidated group. Under current GAAP, deferred income taxes for intra-entity asset transfers are not recognized until the asset is sold to an outside party. ASU 2016-16 allows entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs.

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

ASU 2016-16 is effective for fiscal years and interim periods beginning after December 15, 2017. The amendments in ASU 2016-16 should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We adopted ASU 2016-16 and related amendments effective January 1, 2018 on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of such adoption date. As a result of the amendments in ASU 2016-16, a favorable adjustment $31,645 was recorded directly to retained earnings during the three-month period ending March 31, 2018. The new deferred tax assets will be recognized ratably over the useful life the applicable assets.

Business Combinations

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” to assist entities with evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. To be considered a business, the integrated set of activities and assets to be evaluated must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create an output. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, the integrated set or activities and assets is not considered a business. ASU 2017-01 provides a framework to assist entities in evaluating whether an integrated set of activities and assets include both an input and a substantive process when the assets’ fair value is not concentrated in a single identifiable asset or group of similar identifiable assets.

ASU 2017-01 is effective for fiscal years and interim periods beginning after December 15, 2017. The Company adopted ASU 2017-01 and related amendments effective January 1, 2018.

Accumulated Other Comprehensive Income

In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” ASU 2018-02 provides a remedy to a narrow-scope financial reporting issue created by the Tax Act. The Tax Act required entities to adjust deferred tax assets and liabilities to reflect the impact from newly enacted lower corporate income tax rates, and recognize the effect in income from continuing operations. This requirement applied to all deferred tax assets and liabilities, even those which arose from transactions originally recognized in other comprehensive income. The amendments in ASU 2018-02 allow adjustments to deferred tax assets and liabilities due to newly enacted lower corporate income tax rates to be recognized in retained earnings, if those deferred tax balances arose from transactions originally recognized in other comprehensive income.

Income tax effects are released from accumulated other comprehensive income and recorded against the deferred tax balance in the consolidated balance sheet when the underlying activity is realized.

ASU 2018-02 is effective for annual and interim periods beginning after December 15, 2018. Early adoption of the amendments in this update is permitted, including adoption in any interim period for which financial statements have not yet been issued. The amendments in ASU 2018-02 must be applied in the period of adoption or retrospectively to each period in which the effect of the change in U.S. federal corporate income tax rate in the Tax Act is recognized. We elected to early adopt ASU 2018-02 and related amendments effective January 1, 2018. An adjustment of $40 was recognized against retained earnings for effect of the change in the federal corporate income tax rate on deferred tax amounts. There are no related adjustments to the Company’s valuation allowance and no other income tax effects from the Tax Act on balances that remain in accumulated other comprehensive income were reclassified.

Tax Act

In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income (“GILTI”) provisions of the Tax Act. The GILTI provisions impose a tax on foreign income in excess of deemed return on tangible assets of foreign corporations. In the first quarter of 2018, the Company elected to treat any potential GILTI inclusions as a period cost.

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Recently Issued Accounting Pronouncements Not Yet Adopted

Goodwill Impairment

In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 modified the concept of impairment of goodwill to be a condition that exists when the carrying value of a reporting unit that includes goodwill exceeds its fair value. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, limited to the total amount of goodwill allocated to that reporting unit. Entities no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if the reporting unit had been acquired in a business combination.

ASU 2017-04 is effective for annual and any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption of the amendments in this update is permitted. The amendments in ASU 2017-04 must be applied on a prospective basis and in the initial period of adoption, entities must disclose the nature of and reason for the change in accounting principle. The Company expects adoption of ASU 2017-04 will reduce the complexity of evaluating goodwill for impairment.

Leases

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires lessees to recognize on their balance sheet a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. Payments to be made in optional periods should be included in the measurement of lease assets and liabilities if the lessee is reasonably certain it will exercise an option to extend the lease or not exercise an option to terminate the lease. While ASU 2016-02 continues to differentiate between finance or capital leases and operating leases, the principal change from current lease accounting guidance is that lease assets and liabilities arising from operating leases will be recognized on the balance sheet.

ASU 2016-02 is effective for fiscal years and interim periods beginning after December 15, 2018. Early adoption of the amendments in this update are permitted. Lessees are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach which includes a number of practical expedients, including the ability to use hindsight in evaluating lessee options to extend or terminate a lease. An entity that elects to apply the practical expedients will be required to recognize a right-of-use asset and lease liability for all operating leases at each reporting date based on the present value of the remaining minimum rental payment that were tracked and disclosed under previous GAAP. We are currently in the process of determining the impact the implementation of ASU 2016-02 will have on the Company’s financial statements.

Etratech Acquisition

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Etratech Acquisition

Note 3 — Etratech Acquisition

Etratech designs, develops, manufactures and sells electronic control modules and control systems to customers across a range of industries, including automotive, recreational vehicles and marine, HVAC systems and medical, amongst others. Each function is part of an integrated, customer-focused process designed to exceed customer expectations for product quality, reliability and cost. Etratech’s global manufacturing footprint will enable us to provide customers with scalable and flexible manufacturing solutions across a variety of application and geographies.

Results of operations for Etratech are included in the Company’s consolidated condensed financial statements beginning November 1, 2017. Etratech contributed $15,186 in product revenues and net loss of $300 for the three-month period ended March 31, 2018.

Purchase Price Allocation

The purchase price of $65,009, net of cash acquired of $670, has been allocated to the values of assets acquired and liabilities assumed as of November 1, 2017. The purchase price allocation was finalized during the three-month period ending March 31, 2018. The purchase price allocation as of November 1, 2017 was as follows:


Accounts receivable	$	12,654
Inventory		7,014
Prepaid expenses and other assets		535
Property and equipment		6,205
Customer relationships		24,774
Technology		8,588
Goodwill		14,881
Assumed liabilities		(9,642	)
Net assets acquired		65,009
Cash acquired		670
Purchase price	$	65,679

The gross contractual amount due of accounts receivable is $12,654, all of which is expected to be collectible.

Supplemental Pro Forma Information

The unaudited pro forma combined historical results including the amounts of Etratech revenue and earnings that would have been included in the Company’s consolidated statements of income had the acquisition date been January 1, 2017 is as follows:

	Three Months Ended March 31,
	2017
Product revenues	$	261,950
Net income	$	25,774
Basic earnings per share	$	0.70
Diluted earnings per share	$	0.70

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 indicative of future operating results.

Goodwill

We recorded goodwill of approximately $14,881 arising from the acquisition. The acquired goodwill represents intangible assets that do not qualify for separate recognition. It is estimated that approximately $8,651 of the goodwill recognized will not be deductible for income tax purposes.

Note 3 – Etratech Acquisition – Continued

Intangible Assets

In conjunction with the acquisition, intangible assets of $33,362 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 consisted of the following (balances are lower as of March 31, 2018 than as of November 1, 2017, the acquisition date, due to fluctuations in foreign currency exchange rates totaling $390):

	March 31, 2018
	Gross Value		Accumulated Amortization		Net Value		Useful Life
Customer relationships	$	24,479	$	884	$	23,595	8 -12 yrs
Technology		8,493		691		7,802	5 -6 yrs
Total	$	32,972	$	1,575	$	31,397

Amortization expense of $958 during the three-month period ended March 31, 2018 was recognized in our consolidated condensed statement of income as follows:

	Three Months Ended March 31, 2018
Product revenues	$	536
Cost of sales		422

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

April 1, 2018 through December 31, 2018	$	2,821
2019	$	3,761
2020	$	3,761
2021	$	3,669
2022	$	3,272
2023	$	2,596

Property, Plant & Equipment

Property and equipment consist of the following:

Asset category	Useful life	Amount
Leashold improvements	10 yrs	$	342
Machinery and equipment	4-11 yrs		5,248
Furniture and fittings	4 yrs		230
Motor vehicles	3 yrs		25
Computer hardware and software	1 yrs		360

		$	6,205

Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per Share

Note 4 – Earnings Per Share

Basic earnings per share are computed by dividing net income by the weighted average number of shares of stock outstanding during the period. The Company’s diluted earnings per share give effect to all potential Common Stock outstanding during a period that do not have an anti-dilutive impact to the calculation. In computing the diluted earnings per share, the treasury stock method is used in determining the number of shares assumed to be issued from the exercise of Common Stock equivalents.

The following summarizes the Common Stock included in the basic and diluted shares, as disclosed on the face of the consolidated condensed statements of income:

	Three Months Ended March 31,
	2018		2017
Weighted average number of shares for calculation of basic EPS		36,766,411		36,619,825
Stock options under equity incentive plans		106,996		119,457
Weighted average number of shares for calculation of diluted EPS		36,873,407		36,739,282

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

	Three Months Ended March 31,
	2018		2017
Stock options outstanding for equity incentive plans		1,914,150		1,859,618

Segment Reporting

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Reporting

Note 5 – Segment Reporting

Segment information is used by management for making strategic operating decisions for the Company. Management evaluates the performance of the Company’s segments based primarily on operating income or loss. As discussed in Note 3, Gentherm acquired Etratech on November 1, 2017.

The Company’s reportable segments are as follows:

●

Automotive – this segment represents the design, development, manufacturing and sales of automotive seat comfort systems, specialized automotive cable systems and certain automotive and non-automotive thermal convenience products. All of our activities with respect to electronics are also included in our Automotive segment because the majority of these activities relate to the manufacture of electronic components for our automotive products or the automotive products of third parties. Etratech’s operating results are included within Gentherm’s Automotive segment due to the concentration of Etratech’s product applications within the automotive, recreational vehicle and marine industries.

•

Industrial – the combined operating results of GPT, CSZ 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. Unlike research and development that relates to a specific program application for a customer, advanced research and development activities affect products and technologies that are not currently generating product revenue. The segment includes government sponsored research projects.

●

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

The tables below present segment information about the reported product revenues, depreciation and amortization and operating income (loss) of the Company for three-month periods ended March 31, 2018 and 2017. 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 March 31, 2018, goodwill assigned to our Automotive and Industrial segments were $39,666 and $30,773, respectively. As of March 31, 2017, goodwill assigned to our Automotive and Industrial segments were $21,258 and $30,773, respectively.

Note 5 – Segment Reporting – Continued

Three Months Ended March 31,	Automotive		Industrial			Reconciling Items			Consolidated Total

2018:
Product revenues	$	240,019	$	21,870		$	—		$	261,889
Depreciation and amortization		10,809		1,351			732			12,892
Operating income (loss)		41,282		(6,776	)		(13,835	)		20,671
2017:
Product revenues	$	221,833	$	27,434		$	—		$	249,267
Depreciation and amortization		8,131		1,418			643			10,192
Operating income (loss)		50,757		(2,486	)		(13,422	)		34,849

Total product revenues information by geographic area is as follows:

	Three Months Ended March 31,
	2018				2017
United States	$	120,350	46	%	$	119,523	48	%
China		24,204	9	%		20,465	8	%
Germany		22,362	9	%		17,868	7	%
South Korea		13,822	5	%		16,391	7	%
Japan		13,573	5	%		14,283	6	%
Canada		13,113	5	%		10,929	4	%
Czech Republic		11,715	4	%		10,707	4	%
United Kingdom		10,845	4	%		9,668	4	%
Mexico		6,298	3	%		5,370	2	%
Other		25,607	10	%		24,063	10	%
Total Non-U.S.		141,539	54	%		129,744	52	%
	$	261,889	100	%	$	249,267	100	%

Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Note 6 – Debt

Amended Credit Agreement

The Company, together with certain direct and indirect subsidiaries, have an outstanding credit agreement (as amended, the “Credit Agreement”) with a consortium of lenders and Bank of America, N.A., as administrative agent. The Credit Agreement provides the Company a revolving credit note (U.S. Revolving Note”) with a maximum borrowing capacity of $350,000.

All subsidiary borrowers and guarantors participating in the Credit Agreement have entered into a related pledge and security agreement. The security agreement grants a security interest to the lenders in substantially all of the personal property of subsidiaries designated as borrowers 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). The Credit Agreement restricts the amount of dividend payments the Company can make to shareholders.

The Credit Agreement requires the Company to maintain a minimum Consolidated Interest Coverage Ratio and Consolidated Leverage Ratio. Definitions for these financial ratios are provided in the Credit Agreement.

Under the Credit Agreement, U.S. Dollar denominated loans bear interest at either a base rate (“Base Rate Loans”) or Eurocurrency rate (“Eurocurrency Rate Loans”), plus a margin (“Applicable Rate”). The rate for Base Rate Loans is equal to the highest of the Federal Funds Rate (1.67% at March 31, 2018) plus 0.50%, Bank of America’s prime rate (4.75% at March 31, 2018), or a one-month Eurocurrency rate (0.00% at March 31, 2018) plus 1.00%. The rate for Eurocurrency Rate Loans denominated in U.S. Dollars is equal to the London Interbank Offered Rate (1.88% at March 31, 2018). All loans denominated in a currency other than the U.S. Dollar must be Eurocurrency Rate Loans. Interest is payable at least quarterly.

Note 6 – Debt – Continued

The Applicable Rate varies based on the Consolidated Leverage Ratio reported by the Company. 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 1.25% and 2.00%, respectively, for Eurocurrency Rate Loans and 0.25% and 1.00%, respectively, for Base Rate Loans.

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

DEG China Loan

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

DEG Vietnam Loan

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

As of March 31, 2018, we were in compliance with all terms as outlined in the Credit Agreement, DEG China Loan and DEG Vietnam Loan. Undrawn borrowing capacity under the U.S. Revolving Note was $255,946 as of March 31, 2018. The following table summarizes the Company’s debt at March 31, 2018 and at December 31, 2017.

	March 31, 2018						December 31, 2017
	Interest Rate			Principal Balance			Principal Balance
Credit Agreement:
Revolving Note (U.S. Dollar Denominations)		3.38	%	$	94,000		$	129,000
DEG China Loan		4.25	%		1,477			1,919
DEG Vietnam Loan		5.21	%		13,750			13,750
Total debt					109,227			144,669
Current portion					(3,485	)		(3,460	)
Long-term debt, less current maturities				$	105,742		$	141,209

Note 6 – Debt – Continued

The scheduled principal maturities of our debt as of March 31, 2018 are as follows:

Year	Revolving Note (U.S. Dollar)		DEG China Note		DEG Vietnam Note		Total
Remainder of 2018	$	—	$	492	$	2,500	$	2,992
2019		—		985		2,500		3,485
2020		—		—		2,500		2,500
2021		94,000		—		2,500		96,500
2022		—		—		2,500		2,500
2023		—		—		1,250		1,250
Total	$	94,000	$	1,477	$	13,750	$	109,227

Principal outstanding under the Revolving Note will be due and payable in full on March 17, 2021. As of March 31, 2018, we were in compliance, in all material respects, with all terms as outlined in the Credit Agreement, DEG China Loan and DEG Vietnam Loan.

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 7 – Derivative Financial Instruments

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

The Company regularly enters into derivative contracts with the objective of managing its financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the financial instruments used to hedge them. The maximum length of time over which we hedge our exposure to foreign currency exchange risks is one year. We had foreign currency derivative contracts with a notional value of $32,196 and $29,273 outstanding as of March 31, 2018 and December 31, 2017, respectively.

The maximum length of time over which we hedge our exposure to price fluctuations in material commodities is two years. We had copper commodity swap contracts with a notional value of $0 and $404 outstanding at March 31, 2018 and December 31, 2017, respectively.

We do not enter into derivative financial instrument arrangements for speculative or trading purposes. Our hedging relationships are formally documented at the inception of the hedge, and hedges must be highly effective in offsetting changes to future cash flows on hedged transactions both at the inception of a hedge and on an ongoing basis to be designated for hedge accounting treatment. For derivative contracts which can be classified as a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded to accumulated other comprehensive income (loss) in the consolidated condensed balance sheet. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive income (loss) is recorded in earnings in the consolidated condensed statements of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. We record the ineffective portion of foreign currency hedging instruments, if any, to foreign currency gain (loss) in the consolidated condensed statements of income. See Note 9 for the amount of unrealized loss associated with copper commodity derivatives reported in accumulated other comprehensive income as of December 31, 2017 that was reclassified into earnings during 2018. Though we continuously monitor the hedging program, derivative positions and hedging strategies, foreign currency forward exchange agreements have not always been designated as hedging instruments for accounting purposes.

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

Note 7 – Derivative Financial Instruments – Continued

Information related to the recurring fair value measurement of derivative instruments in our consolidated condensed balance sheet as of March 31, 2018 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

Foreign currency derivatives

Cash flow hedge

Level 2

Current assets

1,168

Current liabilities

)

1,167

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

	Location	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Foreign currency derivatives	Product revenues	$	—		$	—
	Cost of sales	(81		)	(472		)
	Selling, general and administrative		53		(216		)
	Other comprehensive income		2,112		2,960
	Foreign currency (loss) gain		37		(57		)
Total foreign currency derivatives		$	2,121		$	2,215
Commodity derivatives	Cost of sales	$	145		$	19
	Other comprehensive income	(218		)	32
Total commodity derivatives		$	(73	)	$	51

We did not incur any hedge ineffectiveness during the three-month periods ended March 31, 2018 and 2017.

Fair Value Measurement	3 Months Ended
Fair Value Measurement	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 8 – Fair Value Measurement The Company bases fair value on a 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: Inputs, other than quoted market prices included in Level 1, that are observable either directly or indirectly for the asset or liability. Level 3: Unobservable inputs that are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and also considers counterparty credit risk in its assessment of fair value. Except for derivative instruments (see Note 7), pension liabilities, pension plan assets and a corporate owned life insurance policy, the Company had no material financial assets and liabilities that are carried at fair value at March 31, 2018 and December 31, 2017. The carrying amounts of financial instruments comprising cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the relatively short maturity of such instruments. The Company uses an income valuation technique to measure the fair values of its debt instruments by converting amounts of future cash flows to a single present value amount using rates based on current market expectations (Level 2 inputs). Note 8 – Fair Value Measurement – Continued As of March 31, 2018 and December 31, 2017, the carrying values of the Credit Agreement indebtedness were not materially different than their estimated fair values because the interest rates on variable rate debt approximated rates currently available to the Company (see Note 6). Discount rates used to measure the fair value of the DEG Vietnam Loan and DEG China Loan are based on quoted swap rates. As of March 31, 2018, the carrying values of the DEG Vietnam Loan and DEG China Loan was $13,750 and $1,477, respectively, as compared to an estimated fair value of $13,700 and $1,500, respectively. As of December 31, 2017, the carrying value of the DEG Vietnam Loan and DEG China Loan was $13,750 and $1,919, respectively, as compared to an estimated fair value of $13,600 and $2,000, respectively. 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 March 31, 2018 and December 31, 2017, the Company did not realize any changes to the fair value of these assets due to the non-occurrence of events or circumstances that could negatively impact their recoverability.

Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

Note 9 – Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

Reclassification adjustments and other activities impacting accumulated other comprehensive income (loss) during the three-month periods ended March 31, 2018 and March 31, 2017 are as follows:

	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Commodity Hedge Derivatives				Foreign Currency Hedge Derivatives				Total
Balance at December 31, 2017	$	(2,366	)	$	(17,555	)	$	277			$	(800	)		$	(20,444	)
Cumulative effect of accounting change due to adoption of ASU 2018-02		(40	)		—			—				—				(40	)
Other comprehensive income (loss) before reclassifications		—			11,741			—				1,854				13,595
Income tax effect of other comprehensive income before reclassifications		—			(76	)		—				(498	)			(574	)
Amounts reclassified from accumulated other comprehensive income into net income (loss)		—			—			(218	)	^a		258		^a		40
Income taxes reclassified into net income (loss)		—			—			(59	)			(69	)			(128	)
Net current period other comprehensive income (loss)		(40	)		11,665			(277	)			1,545				12,893
Balance at March 31, 2018	$	(2,406	)	$	(5,890	)	$	—			$	745			$	(7,551	)

(a)	The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.

Note 9 – Reclassifications Out of Accumulated Other Comprehensive Income (Loss) – Continued

	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Commodity Hedge Derivatives				Foreign Currency Hedge Derivatives			Total
Balance at December 31, 2016	$	(2,550	)	$	(65,762	)	$	241			$	(1,020	)	$	(69,091	)
Other comprehensive income (loss) before reclassifications		—			5,515			50				1,873			7,438
Income tax effect of other comprehensive income (loss) before reclassifications		—			(3	)		(18	)			(503	)		(524	)
Amounts reclassified from accumulated other comprehensive (income) loss into net income		—			—			(18	)	^a		1,087	^a		1,069
Income taxes reclassified into net income		—			—			7				(292	)		(285	)
Net current period other comprehensive income		—			5,512			21				2,165			7,698
Balance at March 31, 2017	$	(2,550	)	$	(60,250	)	$	262			$	1,145		$	(61,393	)

(a)The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.

We expect all of the existing gains and losses related to foreign currency derivatives and commodity derivatives reported in accumulated other comprehensive income as of March 31, 2018 to be reclassified into earnings during the next twelve months. See Note 7 for additional information about derivative financial instruments and the effects from reclassification to net income.

Unearned Revenue

3 Months Ended

Mar. 31, 2018

Revenue Recognition And Deferred Revenue [Abstract]

Unearned Revenue

Note 10 – Unearned Revenue

Unearned revenue by segment was as follows:

	March 31, 2018		December 31, 2017
Automotive	$	3,426	$	—
Industrial		3,374		4,889
Total	$	6,800	$	4,889

The opening balance of unearned revenue was $4,889 as of January 1, 2018.

Changes in unearned revenue were as follows:

Three Month Ended March 31, 2018
Balance, beginning of period	$	4,889
Additions to unearned revenue		6,909
Reclassified to revenue		(4,999	)
Currency Impacts		1
Balance, end of period	$	6,800

Revenue allocated to remaining performance obligations represent contracted revenue that has not yet been recognized, which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods.

Basis of Presentation and New Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Accounting Principles

Consolidation

Use of Estimates

Revenue Recognition

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Automotive Revenues

Industrial Revenues

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Contract Balances

The opening balance of our accounts receivable, net of allowance for doubtful accounts, was $185,058 as of January 1, 2018.

Activity in the allowance for doubtful accounts was as follows:

Three Months Ended March 31, 2018
Balance, beginning of period	$	973
Additions charged to costs		287
Recoveries recognized in costs		(245	)
Write-offs	$	9
Balance, end of period	$	1,024

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Assets Recognized from the Costs to Obtain a Contract with a Customer

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

The amount by which each financial statement line item was affected by application of ASU 2014-09 and related amendments during the three-month period ended March 31, 2018 is as follows:

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
Three Months Ended March 31, 2018
Product revenues	$	261,209	$	680		$	261,889
Income tax expense		3,177		(141	)		3,036
Net income		12,427		539			12,966
Basic earnings per share		0.34		0.01			0.35
Diluted earnings per share		0.34		0.01			0.35

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
March 31, 2018
Balance Sheet
Accounts receivable, net of allowance for doubtful accounts	$	196,616	$	—		$	196,616
Accrued liabilities	$	69,482	$	3,426		$	72,908
Unearned Revenue	$	3,374	$	3,426		$	6,800
Deferred income taxes, net	$	78,218	$	700		$	78,918
Accumulated earnings	$	337,758	$	(2,726	)	$	335,032

Adoption of ASU 2014-09 and related amendments had no impact to cash from or used in operating, investing or financing activities on our consolidated condensed statements of cash flows.

Statement of Cash Flows

Debt extinguishment payments and debt prepayments are to be shown as cash outflows for financing activities. Presently, Gentherm classifies debt extinguishment payments within operating activities.

Cash receipts from the settlement of corporate-owned life insurance policies shall be classified as cash inflows from investing activities.

Income Taxes

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

Business Combinations

ASU 2017-01 is effective for fiscal years and interim periods beginning after December 15, 2017. The Company adopted ASU 2017-01 and related amendments effective January 1, 2018.

Accumulated Other Comprehensive Income

Income tax effects are released from accumulated other comprehensive income and recorded against the deferred tax balance in the consolidated balance sheet when the underlying activity is realized.

Tax Act

Recently Issued Accounting Pronouncements Not Yet Adopted

Goodwill Impairment

Leases

Basis of Presentation and New Accounting Pronouncements (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Activity in Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts was as follows:

Three Months Ended March 31, 2018
Balance, beginning of period	$	973
Additions charged to costs		287
Recoveries recognized in costs		(245	)
Write-offs	$	9
Balance, end of period	$	1,024

Summary of Financial Statement Affected by Application of ASU 2014-09 and Related Amendments

The amount by which each financial statement line item was affected by application of ASU 2014-09 and related amendments during the three-month period ended March 31, 2018 is as follows:

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
Three Months Ended March 31, 2018
Product revenues	$	261,209	$	680		$	261,889
Income tax expense		3,177		(141	)		3,036
Net income		12,427		539			12,966
Basic earnings per share		0.34		0.01			0.35
Diluted earnings per share		0.34		0.01			0.35

Note 2 – Basis of Presentation and New Accounting Pronouncements – Continued

	Revenue Based on Previously Effective Guidance		New Revenue Standard Adjustment			Revenue Based on New Revenue Standard
March 31, 2018
Balance Sheet
Accounts receivable, net of allowance for doubtful accounts	$	196,616	$	—		$	196,616
Accrued liabilities	$	69,482	$	3,426		$	72,908
Unearned Revenue	$	3,374	$	3,426		$	6,800
Deferred income taxes, net	$	78,218	$	700		$	78,918
Accumulated earnings	$	337,758	$	(2,726	)	$	335,032

Etratech Acquisition (Tables) - Etratech Inc.

3 Months Ended

Mar. 31, 2018

Summary of Preliminary Allocation

The purchase price allocation as of November 1, 2017 was as follows:


Accounts receivable	$	12,654
Inventory		7,014
Prepaid expenses and other assets		535
Property and equipment		6,205
Customer relationships		24,774
Technology		8,588
Goodwill		14,881
Assumed liabilities		(9,642	)
Net assets acquired		65,009
Cash acquired		670
Purchase price	$	65,679

Supplemental Pro Forma Information

	Three Months Ended March 31,
	2017
Product revenues	$	261,950
Net income	$	25,774
Basic earnings per share	$	0.70
Diluted earnings per share	$	0.70

Schedule of Intangible Assets, Net

	March 31, 2018
	Gross Value		Accumulated Amortization		Net Value		Useful Life
Customer relationships	$	24,479	$	884	$	23,595	8 -12 yrs
Technology		8,493		691		7,802	5 -6 yrs
Total	$	32,972	$	1,575	$	31,397

Summary of Amortization Expense

Amortization expense of $958 during the three-month period ended March 31, 2018 was recognized in our consolidated condensed statement of income as follows:

	Three Months Ended March 31, 2018
Product revenues	$	536
Cost of sales		422

Estimate of Total Intangible Asset Amortization

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

April 1, 2018 through December 31, 2018	$	2,821
2019	$	3,761
2020	$	3,761
2021	$	3,669
2022	$	3,272
2023	$	2,596

Summary of Property and Equipment

Property and equipment consist of the following:

Asset category	Useful life	Amount
Leashold improvements	10 yrs	$	342
Machinery and equipment	4-11 yrs		5,248
Furniture and fittings	4 yrs		230
Motor vehicles	3 yrs		25
Computer hardware and software	1 yrs		360

		$	6,205

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Basic and Diluted Shares of Consolidated Condensed Statements of Income

The following summarizes the Common Stock included in the basic and diluted shares, as disclosed on the face of the consolidated condensed statements of income:

	Three Months Ended March 31,
	2018		2017
Weighted average number of shares for calculation of basic EPS		36,766,411		36,619,825
Stock options under equity incentive plans		106,996		119,457
Weighted average number of shares for calculation of diluted EPS		36,873,407		36,739,282

Common Stock Issuable upon Exercise of Certain Stock Options

	Three Months Ended March 31,
	2018		2017
Stock options outstanding for equity incentive plans		1,914,150		1,859,618

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

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

Three Months Ended March 31,	Automotive		Industrial			Reconciling Items			Consolidated Total

2018:
Product revenues	$	240,019	$	21,870		$	—		$	261,889
Depreciation and amortization		10,809		1,351			732			12,892
Operating income (loss)		41,282		(6,776	)		(13,835	)		20,671
2017:
Product revenues	$	221,833	$	27,434		$	—		$	249,267
Depreciation and amortization		8,131		1,418			643			10,192
Operating income (loss)		50,757		(2,486	)		(13,422	)		34,849

Product Revenues Information by Geographic Area

Total product revenues information by geographic area is as follows:

	Three Months Ended March 31,
	2018				2017
United States	$	120,350	46	%	$	119,523	48	%
China		24,204	9	%		20,465	8	%
Germany		22,362	9	%		17,868	7	%
South Korea		13,822	5	%		16,391	7	%
Japan		13,573	5	%		14,283	6	%
Canada		13,113	5	%		10,929	4	%
Czech Republic		11,715	4	%		10,707	4	%
United Kingdom		10,845	4	%		9,668	4	%
Mexico		6,298	3	%		5,370	2	%
Other		25,607	10	%		24,063	10	%
Total Non-U.S.		141,539	54	%		129,744	52	%
	$	261,889	100	%	$	249,267	100	%

Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Summary of Company's Debt

The following table summarizes the Company’s debt at March 31, 2018 and at December 31, 2017.

	March 31, 2018						December 31, 2017
	Interest Rate			Principal Balance			Principal Balance
Credit Agreement:
Revolving Note (U.S. Dollar Denominations)		3.38	%	$	94,000		$	129,000
DEG China Loan		4.25	%		1,477			1,919
DEG Vietnam Loan		5.21	%		13,750			13,750
Total debt					109,227			144,669
Current portion					(3,485	)		(3,460	)
Long-term debt, less current maturities				$	105,742		$	141,209

Principal Maturities of Debt

The scheduled principal maturities of our debt as of March 31, 2018 are as follows:

Year	Revolving Note (U.S. Dollar)		DEG China Note		DEG Vietnam Note		Total
Remainder of 2018	$	—	$	492	$	2,500	$	2,992
2019		—		985		2,500		3,485
2020		—		—		2,500		2,500
2021		94,000		—		2,500		96,500
2022		—		—		2,500		2,500
2023		—		—		1,250		1,250
Total	$	94,000	$	1,477	$	13,750	$	109,227

- 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=84159872&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=75038535&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=64930739&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=84159872&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=84159872&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=64930785&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=64930785&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=84159872&loc=d3e21521-112644

+ Details

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Note 7 – Derivative Financial Instruments – Continued

Information related to the recurring fair value measurement of derivative instruments in our consolidated condensed balance sheet as of March 31, 2018 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

Foreign currency derivatives

Cash flow hedge

Level 2

Current assets

1,168

Current liabilities

)

1,167

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

	Location	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Foreign currency derivatives	Product revenues	$	—		$	—
	Cost of sales	(81		)	(472		)
	Selling, general and administrative		53		(216		)
	Other comprehensive income		2,112		2,960
	Foreign currency (loss) gain		37		(57		)
Total foreign currency derivatives		$	2,121		$	2,215
Commodity derivatives	Cost of sales	$	145		$	19
	Other comprehensive income	(218		)	32
Total commodity derivatives		$	(73	)	$	51

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Income (Loss)

Reclassification adjustments and other activities impacting accumulated other comprehensive income (loss) during the three-month periods ended March 31, 2018 and March 31, 2017 are as follows:

	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Commodity Hedge Derivatives				Foreign Currency Hedge Derivatives				Total
Balance at December 31, 2017	$	(2,366	)	$	(17,555	)	$	277			$	(800	)		$	(20,444	)
Cumulative effect of accounting change due to adoption of ASU 2018-02		(40	)		—			—				—				(40	)
Other comprehensive income (loss) before reclassifications		—			11,741			—				1,854				13,595
Income tax effect of other comprehensive income before reclassifications		—			(76	)		—				(498	)			(574	)
Amounts reclassified from accumulated other comprehensive income into net income (loss)		—			—			(218	)	^a		258		^a		40
Income taxes reclassified into net income (loss)		—			—			(59	)			(69	)			(128	)
Net current period other comprehensive income (loss)		(40	)		11,665			(277	)			1,545				12,893
Balance at March 31, 2018	$	(2,406	)	$	(5,890	)	$	—			$	745			$	(7,551	)

(a)	The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.

Note 9 – Reclassifications Out of Accumulated Other Comprehensive Income (Loss) – Continued

	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Commodity Hedge Derivatives				Foreign Currency Hedge Derivatives			Total
Balance at December 31, 2016	$	(2,550	)	$	(65,762	)	$	241			$	(1,020	)	$	(69,091	)
Other comprehensive income (loss) before reclassifications		—			5,515			50				1,873			7,438
Income tax effect of other comprehensive income (loss) before reclassifications		—			(3	)		(18	)			(503	)		(524	)
Amounts reclassified from accumulated other comprehensive (income) loss into net income		—			—			(18	)	^a		1,087	^a		1,069
Income taxes reclassified into net income		—			—			7				(292	)		(285	)
Net current period other comprehensive income		—			5,512			21				2,165			7,698
Balance at March 31, 2017	$	(2,550	)	$	(60,250	)	$	262			$	1,145		$	(61,393	)

(a)The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.

Unearned Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition And Deferred Revenue [Abstract]

Schedule of Unearned Revenue by Segment

Unearned revenue by segment was as follows:

	March 31, 2018		December 31, 2017
Automotive	$	3,426	$	—
Industrial		3,374		4,889
Total	$	6,800	$	4,889

Schedule of Changes in Unearned Revenue

Changes in unearned revenue were as follows:

Three Month Ended March 31, 2018
Balance, beginning of period	$	4,889
Additions to unearned revenue		6,909
Reclassified to revenue		(4,999	)
Currency Impacts		1
Balance, end of period	$	6,800

The Company and Subsequent Events - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Company And Subsequent Events [Abstract]
Statutory Federal income tax rate	21.00%	35.00%
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense	$ 0	$ 20,153,000
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax balances, provisional income tax expense		5,808,000
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense related to onetime transition tax liability of foreign subsidiaries		23,923,000
Tax cuts and jobs act of 2017, incomplete accounting, benefit included in provision for income taxes to offset one-time transition tax related to previous deferred tax liability that existed for undistributed foreign earnings that were not permanently reinvested		$ 9,578,000

Basis of Presentation and New Accounting Pronouncements (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 01, 2017
Basis Of Presentation And Accounting Policies [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 196,616,000		$ 185,058,000
Aggregate amount of transaction price allocated to material rights that remain unsatisfied	$ 3,426,000
Revenue expected to be recognized in next 12 months	55.00%
Revenue expected to be recognized in 2019	29.00%
Revenue expected to be recognized in 2020	10.00%
Revenue expected to be recognized in 2021	5.00%
Revenue expected to be recognized in 2022	1.00%
Unearned revenue	$ 6,800,000		4,889,000	$ 4,889,000
Cash from or used in operating activities	5,590,000	$ (21,336,000)
Cash from or used in investing activities	(8,393,000)	(15,552,000)
Cash from or used in financing activities	(35,400,000)	$ (8,472,000)
Income tax effects from Tax Act	0		20,153,000
ASU 2018-02
Basis Of Presentation And Accounting Policies [Line Items]
Adjustment against retained earnings for effect of change in federal corporate income tax rate	40,000
Adjustments related to valuation allowance	0
Income tax effects from Tax Act	0
ASU 2014-09
Basis Of Presentation And Accounting Policies [Line Items]
Cash from or used in operating activities	0
Cash from or used in investing activities	0
Cash from or used in financing activities	0
ASU 2016-16
Basis Of Presentation And Accounting Policies [Line Items]
Favourable adjustment to retained earnings	$ 31,645,000
Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Payment terms of contracts	30 days
Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Payment terms of contracts	120 days
Industrial Segments
Basis Of Presentation And Accounting Policies [Line Items]
Unearned revenue	$ 3,374,000		$ 4,889,000

Summary of Activity in Allowance for Doubtful Accounts (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Accounting Policies [Abstract]
Balance, beginning of period	$ 973
Additions charged to costs	287
Recoveries recognized in costs	(245)
Write-offs	9
Balance, end of period	$ 1,024

Summary of Financial Statement Affected by Application of ASU 2014-09 and Related Amendments (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 01, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Product revenues	$ 261,889	$ 249,267
Income tax expense	3,036	7,232
Net income	$ 12,966	$ 25,402
Basic earnings per share	$ 0.35	$ 0.69
Diluted earnings per share	$ 0.35	$ 0.69
Balance Sheet
Accounts receivable, net of allowance for doubtful accounts	$ 196,616		$ 185,058
Accrued liabilities	72,908		77,209
Unearned revenue	6,800		4,889	$ 4,889
Deferred income taxes, net	78,918
Accumulated earnings	335,032		$ 293,645
Revenue Based on Previously Effective Guidance
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Product revenues	261,209
Income tax expense	3,177
Net income	$ 12,427
Basic earnings per share	$ 0.34
Diluted earnings per share	$ 0.34
Balance Sheet
Accounts receivable, net of allowance for doubtful accounts	$ 196,616
Accrued liabilities	69,482
Unearned revenue	3,374
Deferred income taxes, net	78,218
Accumulated earnings	337,758
ASU 2014-09 \| New Revenue Standard Adjustment
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Product revenues	680
Income tax expense	(141)
Net income	$ 539
Basic earnings per share	$ 0.01
Diluted earnings per share	$ 0.01
Balance Sheet
Accrued liabilities	$ 3,426
Unearned revenue	3,426
Deferred income taxes, net	700
Accumulated earnings	$ (2,726)

Etratech Acquisition - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Nov. 01, 2017	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 70,439	$ 69,685
Etratech Inc.
Business Acquisition [Line Items]
Product revenues		15,186
Net loss		300
Net assets acquired	$ 65,009
Cash acquired on acquisition	670
Gross contractual amount due of accounts receivable	12,654
Goodwill	14,881
Goodwill not deductible for income taxes	8,651
Intangible assets before foreign currency adjustment	$ 33,362
Fluctuations in foreign currency exchange rates that reduced intangible assets value		390
Amortization of intangibles		$ 958

Etratech Acquisition - Summary of Preliminary Allocation (Detail) - USD ($) $ in Thousands		3 Months Ended
	Nov. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 70,439		$ 69,685
Purchase price		$ 15	$ 2,000
Etratech Inc.
Business Acquisition [Line Items]
Accounts receivable	$ 12,654
Inventory	7,014
Prepaid expenses and other assets	535
Property and equipment	6,205
Goodwill	14,881
Assumed liabilities	(9,642)
Net assets acquired	65,009
Cash acquired	670
Purchase price	65,679
Etratech Inc. \| Customer relationships
Business Acquisition [Line Items]
Intangible assets	24,774
Etratech Inc. \| Technology
Business Acquisition [Line Items]
Intangible assets	$ 8,588

Etratech Acquisition - Supplemental Pro Forma Information (Detail) - Etratech Inc. $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Product revenues \| $	$ 261,950
Net income \| $	$ 25,774
Basic earnings per share \| $ / shares	$ 0.70
Diluted earnings per share \| $ / shares	$ 0.70

Etratech Acquisition - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Net Value	$ 80,809	$ 83,286
Etratech Inc.
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	32,972
Accumulated Amortization	1,575
Net Value	31,397
Etratech Inc. \| Customer relationships
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	24,479
Accumulated Amortization	884
Net Value	$ 23,595
Etratech Inc. \| Customer relationships \| Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	8 years
Etratech Inc. \| Customer relationships \| Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	12 years
Etratech Inc. \| Technology
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Value	$ 8,493
Accumulated Amortization	691
Net Value	$ 7,802
Etratech Inc. \| Technology \| Minimum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	5 years
Etratech Inc. \| Technology \| Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Useful Life	6 years

Etratech Acquisition - Summary of Amortization Expense (Detail) - Etratech Inc. $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
Amortization of intangibles	$ 958
Product revenues
Business Acquisition [Line Items]
Amortization of intangibles	536
Cost of sales
Business Acquisition [Line Items]
Amortization of intangibles	$ 422

Etratech Acquisition - Summary of Amortization Expense for Prospective Years (Detail) - Etratech Inc. $ in Thousands	Mar. 31, 2018 USD ($)
Business Acquisition [Line Items]
April 1, 2018 through December 31, 2018	$ 2,821
2019	3,761
2020	3,761
2021	3,669
2022	3,272
2023	$ 2,596

Etratech Acquisition - Summary of Property and Equipment (Detail) - Etratech Inc. - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Nov. 01, 2017
Property Plant And Equipment [Line Items]
Property and equipment		$ 6,205
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	10 years
Property and equipment	$ 342
Machinery and equipment
Property Plant And Equipment [Line Items]
Property and equipment	$ 5,248
Machinery and equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	4 years
Machinery and equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	11 years
Furniture and fittings
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	4 years
Property and equipment	$ 230
Motor vehicles
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	3 years
Property and equipment	$ 25
Computer hardware and software
Property Plant And Equipment [Line Items]
Property and equipment, Useful life	1 year
Property and equipment	$ 360

Earnings Per Share (Detail) - shares	3 Months Ended
Earnings Per Share (Detail) - shares	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS	36,766,411	36,619,825
Stock options under equity incentive plans	106,996	119,457
Weighted average number of shares for calculation of diluted EPS	36,873,407	36,739,282
Stock options outstanding for equity incentive plans
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation	1,914,150	1,859,618

Segment Reporting - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Nov. 01, 2017	Mar. 31, 2017
Segment Reporting Information [Line Items]
Goodwill	$ 70,439	$ 69,685
Automotive Segments
Segment Reporting Information [Line Items]
Goodwill	39,666			$ 21,258
Industrial Segments
Segment Reporting Information [Line Items]
Goodwill	$ 30,773			$ 30,773
Etratech Inc.
Segment Reporting Information [Line Items]
Date of acquisition	Nov. 01, 2017
Goodwill			$ 14,881

Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 261,889	$ 249,267
Depreciation and amortization	12,892	10,192
Operating income (loss)	20,671	34,849
Operating Segments \| Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	240,019	221,833
Depreciation and amortization	10,809	8,131
Operating income (loss)	41,282	50,757
Operating Segments \| Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	21,870	27,434
Depreciation and amortization	1,351	1,418
Operating income (loss)	(6,776)	(2,486)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	732	643
Operating income (loss)	$ (13,835)	$ (13,422)

Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
Segment Reporting (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 261,889	$ 249,267
Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Product revenues	$ 120,350	$ 119,523
United States \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	46.00%	48.00%
China
Segment Reporting Information [Line Items]
Product revenues	$ 24,204	$ 20,465
China \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	8.00%
Germany
Segment Reporting Information [Line Items]
Product revenues	$ 22,362	$ 17,868
Germany \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	9.00%	7.00%
South Korea
Segment Reporting Information [Line Items]
Product revenues	$ 13,822	$ 16,391
South Korea \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	7.00%
Japan
Segment Reporting Information [Line Items]
Product revenues	$ 13,573	$ 14,283
Japan \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	6.00%
Canada
Segment Reporting Information [Line Items]
Product revenues	$ 13,113	$ 10,929
Canada \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	5.00%	4.00%
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	$ 11,715	$ 10,707
Czech Republic \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	4.00%
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	$ 10,845	$ 9,668
United Kingdom \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	4.00%	4.00%
Mexico
Segment Reporting Information [Line Items]
Product revenues	$ 6,298	$ 5,370
Mexico \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	3.00%	2.00%
Other
Segment Reporting Information [Line Items]
Product revenues	$ 25,607	$ 24,063
Other \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	10.00%	10.00%
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 141,539	$ 129,744
Non U.S. \| Sales Revenue, Net \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	54.00%	52.00%

Debt - Additional Information (Detail)	3 Months Ended
Debt - Additional Information (Detail)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Maximum percentage of stock of non US subsidiaries pledge to secure obligation	66.00%
Federal Funds Rate \| Minimum
Debt Instrument [Line Items]
Interest rate	0.50%
Federal Funds Rate \| Maximum
Debt Instrument [Line Items]
Interest rate	1.67%
London Interbank Offered Rate
Debt Instrument [Line Items]
Interest rate	1.88%
Revolving Note (U.S. Dollar)
Debt Instrument [Line Items]
Undrawn borrowing capacity	$ 255,946,000
Debt maturity date	Mar. 17, 2021
United State Bank Of America Credit Facility
Debt Instrument [Line Items]
Interest rate	4.75%
Euro Currency Rate Loans \| Minimum
Debt Instrument [Line Items]
Interest rate	0.00%
Euro Currency Rate Loans \| Minimum \| Amended Credit Agreement
Debt Instrument [Line Items]
Interest rate	1.25%
Euro Currency Rate Loans \| Maximum
Debt Instrument [Line Items]
Interest rate	1.00%
Euro Currency Rate Loans \| Maximum \| Amended Credit Agreement
Debt Instrument [Line Items]
Interest rate	2.00%
Base Rate Loans \| Minimum \| Amended Credit Agreement
Debt Instrument [Line Items]
Interest rate	0.25%
Base Rate Loans \| Maximum \| Amended Credit Agreement
Debt Instrument [Line Items]
Interest rate	1.00%
DEG Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date	2015-03
Semi-annual principal payments latest date	2019-09
DEG Vietnam Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date	2017-11
Semi-annual principal payments latest date	2023-05
Revolving Credit Facility \| Revolving Note (U.S. Dollar)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 109,227	$ 144,669
Current portion	(3,485)	(3,460)
Long-term debt, less current maturities	$ 105,742	141,209
Revolving Note (U.S. Dollar Denominations)
Debt Instrument [Line Items]
Interest Rate	3.38%
Total debt	$ 94,000	129,000
DEG China Loan
Debt Instrument [Line Items]
Interest Rate	4.25%
Total debt	$ 1,477	1,919
DEG Vietnam Loan
Debt Instrument [Line Items]
Interest Rate	5.21%
Total debt	$ 13,750	$ 13,750

Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt maturing in remainder of 2018	$ 2,992
Debt maturing in 2019	3,485
Debt maturing in 2020	2,500
Debt maturing in 2021	96,500
Debt maturing in 2022	2,500
Debt maturing in 2023	1,250
Total debt	109,227	$ 144,669
Revolving Note (U.S. Dollar)
Debt Instrument [Line Items]
Debt maturing in 2021	94,000
Total debt	94,000	129,000
DEG China Loan
Debt Instrument [Line Items]
Debt maturing in remainder of 2018	492
Debt maturing in 2019	985
Total debt	1,477	1,919
DEG Vietnam Loan
Debt Instrument [Line Items]
Debt maturing in remainder of 2018	2,500
Debt maturing in 2019	2,500
Debt maturing in 2020	2,500
Debt maturing in 2021	2,500
Debt maturing in 2022	2,500
Debt maturing in 2023	1,250
Total debt	$ 13,750	$ 13,750

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative [Line Items]
Maximum length of time to hedge exposure to foreign currency exchange risk	1 year
Maximum length of time to hedge exposure to price fluctuations in material commodities	2 years
Foreign Currency Derivatives
Derivative [Line Items]
Notional Value	$ 32,196,000		$ 29,273,000
Commodity Derivatives
Derivative [Line Items]
Notional Value	0		$ 404,000
Interest Rate Swap
Derivative [Line Items]
Hedge Ineffectiveness Incurred	$ 0	$ 0

Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Condensed Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - Foreign Currency Derivatives - Designated as Hedging Instrument $ in Thousands	Mar. 31, 2018 USD ($)
Derivatives Fair Value [Line Items]
Net Asset/ (Liabilities)	$ 1,167
Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	1,168
Current Liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	$ (1)

Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 2,121	$ 2,215
Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(73)	51
Other comprehensive income \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	2,112	2,960
Other comprehensive income \| Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(218)	32
Cost of sales \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(81)	(472)
Cost of sales \| Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	145	19
Selling, general and administrative expense \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	53	(216)
Foreign currency (loss) gain \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 37	$ (57)

Fair Value Measurement - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	$ 0	$ 0
Financial liabilities, fair value	0	0
Carrying value	109,227,000	144,669,000
Changes to fair value of assets, realized	0	0
DEG Vietnam Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	13,750,000	13,750,000
Fair value	13,700,000	13,600,000
DEG China Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	1,477,000	1,919,000
Fair value	$ 1,500,000	$ 2,000,000

Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

$ (20,444)

$ (69,091)

Cumulative effect of accounting change due to adoption of ASU 2018-02

(40)

Other comprehensive income (loss) before reclassifications

13,595

7,438

Income tax effect of other comprehensive income (loss) before reclassifications

(574)

(524)

Amounts reclassified from accumulated other comprehensive (income) loss into net income (loss)

1,069

Income taxes reclassified into net income (loss)

(128)

(285)

Other comprehensive income, net of tax

12,893

7,698

Ending Balance

(7,551)

(61,393)

Defined Benefit Pension Plans

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(2,366)

(2,550)

Cumulative effect of accounting change due to adoption of ASU 2018-02

(40)

Other comprehensive income, net of tax

(40)

Ending Balance

(2,406)

(2,550)

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(17,555)

(65,762)

Other comprehensive income (loss) before reclassifications

11,741

5,515

Income tax effect of other comprehensive income (loss) before reclassifications

(76)

(3)

Other comprehensive income, net of tax

11,665

5,512

Ending Balance

(5,890)

(60,250)

Commodity Hedge Derivatives

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

277

241

Other comprehensive income (loss) before reclassifications

Income tax effect of other comprehensive income (loss) before reclassifications

(18)

Amounts reclassified from accumulated other comprehensive (income) loss into net income (loss)

(218)

(18)

^[1]

Income taxes reclassified into net income (loss)

(59)

Other comprehensive income, net of tax

(277)

Ending Balance

262

Foreign Currency Hedge Derivatives

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(800)

(1,020)

Other comprehensive income (loss) before reclassifications

1,854

1,873

Income tax effect of other comprehensive income (loss) before reclassifications

(498)

(503)

Amounts reclassified from accumulated other comprehensive (income) loss into net income (loss)

258

1,087

^[1]

Income taxes reclassified into net income (loss)

(69)

(292)

Other comprehensive income, net of tax

1,545

2,165

Ending Balance

$ 745

$ 1,145

[1]	The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.

Unearned Revenue By Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 6,800	$ 4,889	$ 4,889
Automotive Segments
Deferred Revenue Arrangement [Line Items]
Unearned revenue	3,426
Industrial Segments
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 3,374	$ 4,889

Unearned Revenue - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Revenue Recognition And Deferred Revenue [Abstract]
Unearned revenue	$ 6,800	$ 4,889	$ 4,889

Changes in Unearned Revenue (Detail) $ in Thousands	3 Months Ended
Changes in Unearned Revenue (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Revenue Recognition And Deferred Revenue [Abstract]
Beginning balance	$ 4,889
Additions to unearned revenue	6,909
Reclassified to revenue	(4,999)
Currency Impacts	1
Ending balance	$ 6,800