TPI Composites (TPIC) 10-Q 8 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 03, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	TPIC
Entity Registrant Name	TPI COMPOSITES, INC
Entity Central Index Key	1,455,684
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		34,010,015

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 139,065	$ 119,066
Restricted cash	3,802	2,259
Accounts receivable (Note 3)	134,458	67,842
Inventories	60,593	53,095
Inventories held for customer orders	69,788	52,308
Prepaid expenses and other current assets	29,776	30,657
Total current assets	437,482	325,227
Property, plant, and equipment, net	119,635	91,166
Other noncurrent assets	19,244	20,813
Total assets	576,361	437,206
Current liabilities:
Accounts payable and accrued expenses	160,858	112,281
Accrued warranty	28,150	19,912
Deferred revenue (Note 3)	87,294	69,568
Customer deposits and customer advances	10,409	1,390
Current maturities of long-term debt	44,498	33,403
Total current liabilities	331,209	236,554
Long-term debt, net of debt issuance costs and current maturities	89,139	89,752
Other noncurrent liabilities	4,245	4,393
Total liabilities	424,593	330,699
Commitments and contingencies (Note 10)
Shareholders’ equity: (Note 3)
Preferred shares, $0.01 par value, 5,500 shares authorized, no shares issued or outstanding at September 30, 2017 and December 31, 2016
Common shares, $0.01 par value, 100,000 shares authorized and 34,046 shares issued and 33,994 shares outstanding at September 30, 2017 and 100,000 shares authorized and 33,737 shares issued and outstanding at December 31, 2016	340	337
Paid-in capital	299,532	292,833
Accumulated other comprehensive loss	(1,054)	(3,862)
Accumulated deficit	(146,087)	(182,801)
Treasury stock, at cost, 52 shares at September 30, 2017	(963)
Total shareholders’ equity	151,768	106,507
Total liabilities and shareholders’ equity	$ 576,361	$ 437,206

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,500,000	5,500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	34,046,000	33,737,000
Common stock, shares outstanding	33,994,000	33,737,000
Treasury stock, shares	52,000

Condensed Consolidated Income S

Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales (Note 3)	$ 243,354	$ 198,938	$ 683,142	$ 569,303
Cost of sales	198,141	171,648	568,659	499,896
Startup and transition costs	12,352	5,088	29,051	11,449
Total cost of goods sold	210,493	176,736	597,710	511,345
Gross profit	32,861	22,202	85,432	57,958
General and administrative expenses	9,315	14,065	28,373	24,154
Income from operations	23,546	8,137	57,059	33,804
Other income (expense):
Interest income	48	27	78	76
Interest expense	(3,254)	(4,663)	(9,215)	(12,709)
Realized gain (loss) on foreign currency remeasurement	39	(243)	(2,575)	(700)
Miscellaneous income (expense)	390	(152)	968	192
Total other expense	(2,777)	(5,031)	(10,744)	(13,141)
Income before income taxes	20,769	3,106	46,315	20,663
Income tax provision	(371)	(309)	(8,514)	(4,565)
Net income	20,398	2,797	37,801	16,098
Net income attributable to preferred shareholders		596		5,471
Net income attributable to common shareholders	$ 20,398	$ 2,201	$ 37,801	$ 10,627
Weighted-average common shares outstanding:
Basic	33,891	27,284	33,789	12,042
Diluted	35,015	27,375	34,748	12,133
Net income per common share:
Basic	$ 0.60	$ 0.08	$ 1.12	$ 0.88
Diluted	$ 0.58	$ 0.08	$ 1.09	$ 0.88

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 20,398	$ 2,797	$ 37,801	$ 16,098
Other comprehensive income:
Foreign currency translation adjustments	1,231	(344)	2,808	(1,169)
Comprehensive income	$ 21,629	$ 2,453	$ 40,609	$ 14,929

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 37,801	$ 16,098
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,622	9,703
Share-based compensation expense	4,794	8,117
Amortization of debt issuance costs	430	1,273
Amortization of debt discount		3,018
Changes in assets and liabilities:
Accounts receivable	(66,438)	(27,237)
Inventories	(24,979)	(6,592)
Prepaid expenses and other current assets	881	4,922
Other noncurrent assets	3,067	(6,900)
Accounts payable and accrued expenses	47,498	6,339
Accrued warranty	8,238	17,461
Customer deposits	9,019	4,870
Deferred revenue	17,726	(3,571)
Other noncurrent liabilities	(136)	475
Net cash provided by operating activities	51,523	27,976
Cash flows from investing activities:
Purchase of property and equipment	(35,312)	(18,917)
Net cash used in investing activities	(35,312)	(18,917)
Cash flows from financing activities:
Proceeds from issuance of common stock in initial public offering, net of underwriters discount and offering costs		67,199
Repayments of term loan	(2,812)	(617)
Net proceeds from (repayments of) accounts receivable financing	8,196	(6,050)
Net repayments of working capital loans	(4,638)	(4,097)
Net proceeds from (repayments of) other debt	4,556	(3,415)
Proceeds from exercise of stock options	988
Repurchase of common stock including shares withheld in lieu of income taxes	(1,264)
Restricted cash	(1,543)	(649)
Net cash provided by financing activities	3,483	52,371
Impact of foreign exchange rates on cash and cash equivalents	305	(545)
Net change in cash and cash equivalents	19,999	60,885
Cash and cash equivalents, beginning of year	119,066	45,917
Cash and cash equivalents, end of period	139,065	106,802
Supplemental disclosures of cash flow information:
Cash paid for interest	8,717	9,505
Cash paid for income taxes, net	14,134	5,191
Supplemental disclosures of noncash investing and financing activities:
Conversion of subordinated convertible promissory notes into common stock		11,877
Equipment acquired through capital lease and financing obligations	4,749	1,464
Accrued capital expenditures in accounts payable	$ 3,689	$ 3,610

Summary of Operations and Signi

Summary of Operations and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Operations and Significant Accounting Policies	Note 1. Summary of Operations and Significant Accounting Policies Description of Business TPI Composites, Inc. is the holding company that conducts substantially all of its business operations through its direct and indirect subsidiaries (collectively, the Company). The Company was founded in 1968 and has been producing composite wind blades since 2001. The Company’s knowledge and experience of composite materials and manufacturing originates with its predecessor company, Tillotson Pearson Inc., a leading manufacturer of high-performance sail and powerboats along with a wide range of composite structures used in other industrial applications. Following the separation from the boat building business in 2004, the Company reorganized in Delaware as LCSI Holding, Inc. and then changed its corporate name to TPI Composites, Inc. in 2008. Today, the Company is headquartered in Scottsdale, Arizona and has expanded its global footprint to include domestic facilities in Newton, Iowa; Fall River, Massachusetts; Warren, Rhode Island and Santa Teresa, New Mexico and international facilities in Dafeng, China; Taicang Port, China; Taicang City, China; Juárez, Mexico and Izmir, Turkey. In April 2017, the Company entered into a new lease agreement with a third party for a new manufacturing facility in Matamoros, Mexico, and the Company expects to commence operations at this facility in the second half of 2018. Initial Public Offering and Stock Split In July 2016, the Company completed an initial public offering (IPO) of 7,187,500 shares of the Company’s common stock at a price of $11.00 per share, which included 937,500 shares issued pursuant to the underwriters’ over-allotment option. Certain of the Company’s existing shareholders, a director and executive officers purchased an aggregate of 1,250,000 shares of common stock in the IPO included in the total issuance above. The net proceeds from the IPO were $67.2 million after deducting underwriting discounts and offering expenses. Immediately prior to the closing of the IPO, all shares of the then-outstanding redeemable preferred shares converted into an aggregate of 21,110,204 shares of common stock and the redeemable preferred share warrants converted on a net issuance basis into 120,923 shares of common stock. In addition, concurrent with the closing of the IPO, certain subordinated convertible promissory notes in the aggregate principal and interest amount of $11.9 million were converted into 1,079,749 shares of common stock at the public offering price of $11.00 per share. Prior to the IPO, in July 2016 the Company amended its amended and restated certificate of incorporation to effect a 360-for-1 forward stock split of its common stock. As a result of the stock split, the Company has adjusted the share amounts authorized and issuable under the share-based compensation plans. All share and per share common stock information (including the share-based compensation plans) referenced throughout the unaudited condensed consolidated financial statements and notes thereto have been retroactively adjusted to reflect this stock split. The stock split did not cause an adjustment to the par value of the authorized shares of common stock. Secondary Public Offering In May 2017, the Company completed a secondary public offering of 5,075,000 shares of its common stock at a price of $16.35 per share, which included 575,000 shares issued pursuant to the underwriters’ option to purchase additional shares. All of the shares were sold by existing shareholders and certain executive officers of the Company. The selling shareholders received all of the net proceeds of $78.8 million from the secondary public offering. The Company did not sell any shares and did not receive any of the proceeds from the offering and the costs paid by the Company in connection with the offering of $0.8 million were recorded in general and administrative costs in the accompanying condensed consolidated income statement. Basis of Presentation The Company divides its business operations into four geographic operating segments—the United States, Asia, Mexico and Europe, the Middle East and Africa (EMEA) as follows: • The U.S. segment includes (1) the manufacturing of wind blades at the Newton, Iowa plant, (2) the manufacturing of precision molding and assembly systems used for the manufacture of wind blades in the Warren, Rhode Island facility, (3) the manufacturing of composite solutions for the transportation industry, which the Company also conducts in its Rhode Island and Massachusetts facilities and (4) its corporate headquarters, the costs of which are included in general and administrative expenses. • The Asia segment includes (1) the manufacturing of wind blades at a facility in Taicang Port, China and at its two facilities in Dafeng, China, (2) the manufacturing of precision molding and assembly systems in the Taicang City, China facility, (3) the manufacture of components in a second Taicang Port, China facility and (4) wind blade inspection and repair services. • The Mexico segment manufactures wind blades from three facilities in Juárez, Mexico, one of which commenced operations in 2014, the second during the third quarter of 2016 and the third in January 2017. In April 2017, the Company entered into a new lease agreement with a third party for a new manufacturing facility in Matamoros, Mexico and the Company expects to commence operations at this facility in the second half of 2018. • The EMEA segment manufactures wind blades from two facilities in Izmir, Turkey. The Company entered into a joint venture in 2012 to produce wind blades at the first Turkey plant and in 2013 became the sole owner of the Turkey operation with the acquisition of the remaining 25% interest. The EMEA segment commenced operations in the second facility during the third quarter of 2016. The accompanying consolidated financial statements include the accounts of TPI Composites, Inc. and all majority owned subsidiaries. All significant intercompany transactions and balances have been eliminated. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the SEC and should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (GAAP) have been condensed or omitted, as permitted by the SEC, although the Company believes the disclosures that are made are adequate to make the information presented herein not misleading. The accompanying condensed consolidated financial statements reflect, in the opinion of management, all normal recurring adjustments necessary to present fairly the Company’s financial position at September 30, 2017, and the results of the Company’s operations, comprehensive income and cash flows for the periods presented. The Company derived the December 31, 2016 condensed consolidated balance sheet data from audited financial statements, but does not include all disclosures required by GAAP. Interim results for the three and nine months ended September 30, 2017 and 2016 are not necessarily indicative of the results to be expected for the full years. Warranty Expense The Company provides a limited warranty for its mold and wind blade products, including parts and labor, with terms and conditions that vary depending on the product sold, for periods that range from two to five years. Warranty expense is recorded based upon estimates of future repairs using a probability-based methodology. Once the warranty period has expired, any remaining unused warranty accrual for the specific products is reversed against the current year warranty expense amount. Warranty accrual at September 30 consisted of the following (in thousands): 2017 Warranty accrual at beginning of year $ 19,912 Accrual during the period 10,696 Cost of warranty services provided during the period (372 ) Reversal of reserves upon warranty expiration (2,086 ) Warranty accrual at end of period $ 28,150 Treasury Stock Common stock purchased for treasury is recorded at historical cost. Transactions in treasury shares are primarily related to share-based compensation plans and are recorded at weighted-average cost. Net Income Attributable to Preferred Shareholders Net income attributable to preferred shareholders related to the accrual of dividends on previously outstanding convertible and senior redeemable preferred shares, the accretion to redemption amounts on the convertible preferred shares and warrant fair value adjustment. Immediately prior to the closing of the Company’s IPO, all preferred shares were converted into shares of the Company’s common stock and as a result, the accrual of dividends ceased. Net Income Per Share Calculation The basic net income per common share is computed by dividing the net income by the weighted-average number of common shares outstanding during a period. Diluted net income per common share is computed by dividing the net income Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Basic weighted-average shares outstanding 33,891 27,284 33,789 12,042 Effect of dilutive stock options and warrants 1,124 91 959 91 Diluted weighted-average shares outstanding 35,015 27,375 34,748 12,133 The Company did not have any potentially dilutive securities outstanding that are not included in the diluted net income per share calculation for the three and nine months ended September 30, 2017 and 2016. Use of Estimates The preparation of these condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted in 2017 In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-09, Compensation – Stock Compensation: Improvement to Employee Share-Based Payment Accounting The Company adopted ASU 2016-09 in the first quarter of 2017 using the modified retrospective transition method through a cumulative effect adjustment to equity as of January 1, 2017. Upon adoption, the Company elected to eliminate application of a forfeiture assumption to share based compensation expense and account for forfeitures as they occur over the vesting period. The cumulative effect of this change increased additional paid-in capital and decreased retained earnings as of January 1, 2017 by $1.1 million. The Company did not have any previously unrecognized excess tax effects that had not been recorded as a reduction to the tax liability. The Company did not recognize any excess tax benefits from the vesting of restricted stock units and stock options which were later exercised during the three and nine months ended September 30, 2017 due to the valuation allowance recorded against the U.S. federal and state deferred tax assets. The provisions of the standard relating to the cash flow presentation and income taxes are included in the accompanying statements of cash flows and income statements for applicable periods presented in the accompanying financial statements. If or when the valuation allowance recorded against the U.S. federal and state deferred tax assets is released, the inclusion of excess tax benefits and deficiencies as a component of the Company’s income tax expense in future periods will increase volatility within the provision for income taxes as the amount of excess tax benefits or deficiencies from share-based compensation awards are dependent on the Company’s stock price at the date the restricted awards vest, the stock price on the date an option is exercised and the quantity of options exercised. Revenue from Contracts with Customers In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers The new requirements are effective for the Company beginning January 1, 2018, and may be implemented either retrospectively for all periods presented, or as a cumulative-effect adjustment as of the date of adoption. The Company will adopt Topic 606 as of January 1, 2018 with retrospective application to January 1, 2015 through December 31, 2017. Based on the Company’s evaluation of the new standard, revenue recognition in accordance with Topic 606 differs from the current guidance provided by GAAP as outlined in the SEC’s Staff Accounting Bulletin 104, which requires the Company to defer recognition of revenue until the risk of loss has passed to the customer and delivery has been made or a fixed delivery schedule has been provided by the customer. Since the Company’s products have no alternative use to the Company due to contractual restrictions placed by each customer on the technical specifications and design of the products, the Company’s assessment is that revenue upon adoption of Topic 606 will be recognized over time during the course of the production process and before the product is delivered to the customer. The Company expects that the adoption of Topic 606 will have a material impact on the amount of net sales, cost of goods sold and income from operations reported in the consolidated income statements in future periods. In accordance with Topic 606, revenues will be recognized over the time period of the production process, whereas currently it is recognized upon delivery to the customer. Further, since revenue will be recognized over time for manufacturing contracts, future net sales will include amounts related to products that are in production as of the period end. Finally, the gross margin realized in the period may be impacted by the changes related to the timing and amount of revenue recognized for products in the production process. Although Topic 606 does not have a cash impact nor an effect on the economics of the Company's underlying customer contracts, applying Topic 606 to contracts in startup and transition will likely result in higher reported earnings in 2018 than under the previous guidance as revenue is shifted to the initial years of startup and transition activities of a contract. Topic 606 will not change the total amount of revenue recognized under the Company’s long-term supply contracts, only accelerate the timing of when the revenue is recognized. The Company expects a corresponding acceleration in timing of cost of goods sold recognition for these contracts upon adoption of Topic 606. The changes noted above involving the timing of revenue recognition will materially impact the amount of reported assets and liabilities on the consolidated balance sheet associated with the Company’s manufacturing contracts. Upon adoption of Topic 606, the Company will include amounts recognized in revenue for products in production as contract assets on the consolidated balance sheet, which differs from the current practice of including the balances in inventory, and will include an amount for the margin recognized to date. The Company will no longer report inventory held for customer orders since revenue will be recognized over time during the course of the production process and before the product is delivered to the customer. Work performed as production takes place will lead to revenue recognition and be included in the consolidated balance sheet under contract assets until billed. The Company expects that contract liabilities will be reported for amounts collected from customers in advance of the production of products. The Company also expects that the amount of deferred revenue will be substantially reduced as revenue for products will be recognized over time. The Company does not anticipate a change in the timing of cash receipts and payments from customers as customers will continue to be invoiced as products are completed. In addition, the Company does not expect changes to the aggregate amount of cash flows from operating activities in the consolidated statements of cash flows; however, the impact of changes in the captions on the consolidated balance sheet will have a material effect on the captions within cash flows from operating activities in the consolidated statements of cash flows. The Company has a project plan in place for the transition to revenue recognition in accordance with Topic 606 including necessary changes to accounting processes and procedures, the chart of accounts, the system of internal control and retrospective application of the standard to periods beginning January 1, 2015 through December 31, 2017. The Company expects to complete the plan in time to report in accordance with Topic 606 for the first quarterly filing on Form 10-Q for the period ended March 31, 2018. Cash Flow Presentation In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments Restricted Cash Leases In February 2016, the FASB issued ASU 2016-02, Leases

Significant Risks and Uncertain

Significant Risks and Uncertainties	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Significant Risks and Uncertainties	Note 2. Significant Risks and Uncertainties The Company’s revenues and receivables are from a small number of customers. As such, the Company’s production levels are dependent on these customers’ orders. See note 11, Concentration of Customers. The Company maintains its U.S. cash in bank deposit accounts that, at times, exceed U.S. federally insured limits. U.S. bank accounts are guaranteed by the Federal Deposit Insurance Corporation (FDIC) in an amount up to $250,000 during 2017 and 2016. At September 30, 2017 and December 31, 2016, the Company had $105.6 million and $103.4 million, respectively, of cash in deposit accounts in high quality U.S. banks, which was in excess of FDIC limits. The Company has not experienced losses in any such accounts. The Company also maintains cash in bank deposit accounts outside the U.S. with no deposit insurance. This includes $31.5 million in China, $1.2 million in Turkey and $0.8 million in Mexico as of September 30, 2017. The Company has not experienced losses in these accounts in the past.

Related-Party Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related-Party Transactions	Note 3. Related-Party Transactions Related party transactions include transactions between the Company and certain of its affiliates. The following transactions were in the normal course of operations and were measured at the exchange amount, which is the amount of consideration established and agreed to by the parties. The Company has entered into several agreements with subsidiaries of General Electric Company and its consolidated affiliates (GE) relating to the operation of its business. As a result of these agreements, GE has been a debtor, creditor and holder of both preferred and common shares. During the second quarter of 2017, GE reduced its holdings of the Company’s common shares to less than five percent of the total shares outstanding and then completely divested of the Company’s common shares during the current quarter. The Company has entered into five separate supply agreements with GE to manufacture wind blades in Newton, Iowa; Taicang Port, China; Juárez, Mexico (2) and Izmir, Turkey. The supply agreements in Taicang Port, China and Izmir, Turkey expire December 31, 2017 and GE has decided not to renew or extend these two contracts. As a result of the supply agreements, GE is the Company’s largest customer. For the six months ended June 30, 2017, the Company recorded related-party sales with GE of $187.3 million. As disclosed at note 11, Concentration of Customers In January 2016, the Company entered into an agreement with GE and received an advance of $2.0 million, which the Company repaid in full in August 2016. Certain of the Company’s existing stockholders, consisting of entities associated with Element Partners, Angeleno Group and Landmark Partners, each of which is an affiliate of a member of the board of directors, as well as certain executive officers and a director, purchased an aggregate of 1,250,000 shares of common stock in the IPO. In addition, all outstanding obligations and accrued interest under the Company’s subordinated convertible promissory notes held by certain existing stockholders, including Element Partners, Angeleno Group and Landmark Partners, were converted into an aggregate of 1,079,749 shares of common stock concurrent with the closing of the IPO at the public offering price of $11.00 per share. In connection with the Company’s secondary offering, certain entities associated with Element Partners, Angeleno Group, Landmark Partners and NGP Energy Technology Partners, L.P, as well as certain executive officers of the Company sold an aggregate of 5,075,000 shares of common stock at the public offering price of $16.35 per share.

Accounts Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Accounts Receivable	Note 4. Accounts Receivable Accounts receivable consisted of the following (in thousands): September 30, December 31, 2017 2016 Trade accounts receivable $ 130,578 $ 66,612 Other accounts receivable 3,880 1,230 Total accounts receivable $ 134,458 $ 67,842

Inventories

Inventories	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Note 5. Inventories Inventories consisted of the following (in thousands): September 30, December 31, 2017 2016 Raw materials $ 30,260 $ 29,278 Work in process 27,122 21,169 Finished goods 3,211 2,648 Total inventories $ 60,593 $ 53,095

Property, Plant, and Equipment,

Property, Plant, and Equipment, Net	9 Months Ended
	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Property, Plant, and Equipment, Net	Note 6. Property, Plant and Equipment, Net Property, plant and equipment, net consisted of the following (in thousands): September 30, December 31, 2017 2016 Machinery and equipment $ 92,938 $ 70,481 Buildings 14,603 13,449 Leasehold improvements 21,518 16,818 Office equipment and software 11,061 6,403 Furniture 20,235 15,883 Vehicles 341 342 Construction in progress 16,472 11,592 Total 177,168 134,968 Accumulated depreciation (57,533 ) (43,802 ) Property, plant and equipment, net $ 119,635 $ 91,166 Total depreciation expense for the three months ended September 30, 2017 and 2016 was $5.1 million and $3.5 million, respectively, and for the nine months ended September 30, 2017 and 2016 was $13.5 million and $9.7 million, respectively.

Long-Term Debt, Net of Debt Iss

Long-Term Debt, Net of Debt Issuance Costs and Current Maturities	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Long-Term Debt, Net of Debt Issuance Costs and Current Maturities	Note 7. Long-Term Debt, Net of Debt Issuance Costs and Current Maturities Long-term debt, net of debt issuance costs and current maturities, consisted of the following (in thousands): September 30, December 31, 2017 2016 Senior term loan—U.S. $ 72,188 $ 75,000 Senior revolving loan—U.S. 2,820 2,820 Accounts receivable financing—EMEA 23,316 15,120 Unsecured financing—EMEA — 4,638 Equipment financing—EMEA 17,704 15,813 Equipment capital lease—Mexico 14,731 8,037 Equipment capital lease—U.S. 867 2,016 Equipment capital lease—EMEA 3,810 1,898 Equipment loan—Mexico 61 103 Total long-term debt 135,497 125,445 Less: Debt issuance costs (1,860 ) (2,290 ) Total long-term debt, net of debt issuance costs 133,637 123,155 Less: Current maturities of long-term debt (44,498 ) (33,403 ) Long-term debt, net of debt issuance costs and current maturities $ 89,139 $ 89,752

Share-Based Compensation Plans

Share-Based Compensation Plans	9 Months Ended
	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation Plans	Note 8. Share-Based Compensation Plans The Company has granted restricted stock unit (RSU) and stock option awards to certain employees and non-employee directors under the Amended and Restated 2015 Stock Option and Incentive Plan (the 2015 Plan). Each award granted prior to the consummation of the IPO included a performance condition that required the completion of an initial public offering by the Company and a required vesting period of one to four years, commencing upon achievement of the performance condition. As the IPO was consummated in July 2016, the Company began recording compensation expense in the third quarter of 2016 for the requisite service period from the grant date through the IPO date, with the balance of the share-based compensation to be expensed over the remaining vesting period. Total share-based compensation expense recognized during the three months ended September 30, 2017 was $1.0 million, of which $0.2 million is included in cost of goods sold and the remaining $0.8 million is included in general and administrative expenses. The amount related to RSUs was $0.4 million while $0.6 million related to stock options. Total share-based compensation expense recognized during the nine months ended September 30, 2017 was $4.8 million, of which $0.8 million is included in cost of goods sold and the remaining $4.0 million is included in general and administrative expenses. The amount related to RSUs was $1.5 million while $3.3 million related to stock options. No share-based compensation costs were capitalized during the three or nine months ended September 30, 2017 and 2016. As of September 30, 2017, the unamortized cost of the unvested RSUs was $1.8 million, which the Company expects to recognize in the consolidated financial statements over a weighted-average period of approximately 1.3 years. The total unrecognized cost related to unvested stock option awards was $5.3 million as of September 30, 2017. The Company expects to recognize such costs in the consolidated financial statements over a weighted-average period of approximately 1.9 years. The following table summarizes the activity of the stock options and RSUs under the Company’s incentive plans: Stock Options RSUs Shares Available for Grant Shares Weighted- Average Exercise Price Options Exercisable Units Weighted- Average Grant Date Fair Value Balance as of December 31, 2016 3,587,692 3,331,418 $ 12.72 25,828 636,120 $ 10.90 Increase in shares authorized 1,349,475 — — — — Granted (190,290 ) 161,090 20.00 29,200 16.69 Exercised/vested — (107,527 ) 10.81 (218,040 ) 10.95 Forfeited/cancelled 227,650 (202,450 ) 11.54 (25,200 ) 10.87 Balance as of September 30, 2017 4,974,527 3,182,531 13.23 729,196 422,080 11.27 The following table summarizes the outstanding and exercisable stock option awards as of September 30, 2017: Options Outstanding Options Exercisable Range of Exercise Prices: Shares Weighted- Average Remaining Contractual Life ( in years Weighted- Average Exercise Price Shares Weighted- Average Exercise Price $8.49 22,728 2.3 $ 8.49 22,728 $ 8.49 $ 10.87 2,004,700 7.7 10.87 465,700 10.87 $11.00 to $16.53 656,523 8.3 16.12 157,072 16.33 $18.70 342,790 8.7 18.68 83,696 18.70 $20.05 to $22.34 155,790 9.9 20.14 — — $8.49 to $22.34 3,182,531 8.0 13.23 729,196 12.87

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 9. Income Taxes Income tax expense was $0.4 million and $0.3 million in the three months ended September 30, 2017 and 2016, respectively, and $8.5 million and $4.6 million in the nine months ended September 30, 2017 and 2016, respectively. The lower effective tax rate was primarily due to the release of the valuation allowance which was recorded against the Turkey operation’s deferred tax assets as well as the tax benefit received by the Turkey operations in the third quarter of 2017 from new tax incentives from the Turkish government. The Company has historically provided a valuation allowance to reduce its U.S. federal, state and non-U.S. deferred tax assets to the amount that is more likely than not to be realized. In the current quarter, the Company released the majority of its valuation allowance against its Turkey operation’s deferred tax assets, resulting in a non-cash benefit to income tax expense of approximately $2.6 million, $1.2 million of which was related to future earnings. Given the Turkey operation’s current level of pre-tax income, and assuming the Turkey operations maintains this current level of pre-tax income at a minimum, the Company expects to generate income before taxes in Turkey in future periods at a level that would fully realize the benefit of its deferred tax assets in Turkey. As of September 30, 2017, the Company continues to maintain a valuation allowance against net deferred tax assets in the U.S. and certain of its state jurisdictions where it does not currently believe that the realization of the deferred tax assets is more likely than not. The Company evaluates its deferred tax assets quarterly to determine whether adjustments to the valuation allowance are appropriate in light of changes in facts or circumstances, such as changes in expected future pre-tax earnings, tax law, interactions with taxing authorities and developments in case law. In making this evaluation, the Company relies on its recent history of pre-tax earnings. The Company's material assumptions are its forecasts of future pre-tax earnings and the nature and timing of future deductions and income represented by the deferred tax assets and liabilities, all of which involve the exercise of significant judgment. The impact of the new tax incentives received related to the Turkey operations was $1.8 million, all of which will be used to reduce the taxes paid on future earnings. No other changes in tax law since December 31, 2016 have had a material impact on the Company’s income tax provision.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10. Commitments and Contingencies Legal Proceedings A complaint was filed against the Company in the Superior Court of the State of Arizona (Maricopa County) by a former employee of the Company, alleging that the Company had agreed to make certain cash payments to such employee upon any future sale of the Company. The Company denies the substantive allegations of the complaint and intends to vigorously defend this lawsuit; however, the Company is currently unable to determine the ultimate outcome of this case. The Court has set a trial date in August 2018. In addition, the Company entered into a transition agreement with a former officer, pursuant to which he transitioned out of his role at the end of 2015 and was to serve in a consulting capacity in 2016 and 2017. In January 2016, following the discovery that he had materially violated the terms of his transition agreement, the Company terminated his consultancy for cause. In April 2016, the officer filed an arbitration claim alleging that the Company improperly terminated his transition agreement. The Company believes that the termination of his transition agreement was valid and the Company intends to vigorously defend this matter. The arbitration tribunal held that the former officer was entitled to a portion of the compensation and other payments contemplated under the transition agreement. The Company has appealed the arbitration tribunal’s decision to a Chinese court and the appeal remains pending. The Company is involved in various claims and legal actions arising in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations or liquidity.

Concentration of Customers

Concentration of Customers	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Concentration of Customers	Note 11. Concentration of Customers Revenues from certain customers in excess of 10 percent of total consolidated Company revenues (dollars in thousands) are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Customer Revenues % of Total Revenues % of Total Revenues % of Total Revenues % of Total GE $ 99,623 40.9 % $ 98,141 49.3 % $ 286,941 42.0 % $ 292,435 51.4 % Vestas 69,125 28.4 50,300 25.3 195,556 28.6 120,716 21.2 Nordex Group 46,998 19.3 31,132 15.6 119,530 17.5 96,139 16.9 Gamesa 23,820 9.8 17,844 9.0 71,405 10.5 54,553 9.6 Other 3,788 1.6 1,521 0.8 9,710 1.4 5,460 0.9 Total $ 243,354 100.0 % $ 198,938 100.0 % $ 683,142 100.0 % $ 569,303 100.0 % Trade accounts receivable from certain customers in excess of 10 percent of total consolidated Company trade accounts receivable are as follows: September 30, December 31, 2017 2016 Customer % of Total % of Total GE 17.1 % 24.9 % Vestas 42.7 % 26.2 % Nordex Group 28.0 % 26.8 % Gamesa 8.7 % 16.2 %

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	Note 12. Segment Reporting The Company’s operating segments are defined geographically as the United States, Asia, Mexico and EMEA. Financial results are aggregated into four reportable segments based on quantitative thresholds. All of the Company’s segments operate in their local currency except for the China and Mexico segments, which both include a U.S. parent company. The following tables set forth certain information (in thousands) regarding each of the Company’s segments: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Revenues by segment: U.S. $ 44,599 $ 45,090 $ 136,314 $ 141,920 Asia 102,463 86,834 278,284 232,639 Mexico 44,941 35,448 134,010 88,623 EMEA 51,351 31,566 134,534 106,121 Total revenues $ 243,354 $ 198,938 $ 683,142 $ 569,303 Revenues by geographic location (1): U.S. $ 44,599 $ 45,090 $ 136,314 $ 141,920 China 102,463 86,834 278,284 232,639 Mexico 44,941 35,448 134,010 88,623 Turkey 51,351 31,566 134,534 106,121 Total revenues $ 243,354 $ 198,938 $ 683,142 $ 569,303 Income (loss) from operations: U.S. (2) $ (8,120 ) $ (12,929 ) $ (26,247 ) $ (18,052 ) Asia 24,031 17,291 64,191 48,055 Mexico 3,286 3,574 5,254 6,197 EMEA 4,349 201 13,861 (2,396 ) Total income from operations $ 23,546 $ 8,137 $ 57,059 $ 33,804 September 30, December 31, 2017 2016 Property, plant and equipment, net: U.S. $ 21,693 $ 16,740 Asia (China) 29,262 26,341 Mexico 40,359 24,842 EMEA (Turkey) 28,321 23,243 Total property, plant and equipment, net $ 119,635 $ 91,166 (1) Revenues are attributable to countries based on the location where the product is manufactured or the services are performed. (2) The losses from operations in the U.S. segment includes corporate general and administrative costs of $9.3 million and $14.1 million for the three months ended September 30, 2017 and 2016, respectively, and $28.4 million and $24.2 million for the nine months ended September 30, 2017 and 2016, respectively.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 13. Subsequent Events In October 2017, the Company granted an aggregate of 191,300 RSU awards to certain employees. Each of these RSU awards vests as follows: 20% on March 7, 2018, 30% on March 7, 2019 and the remaining 50% on March 7, 2020. The Company estimates that the total share-based-compensation expense for these RSU awards will be approximately $4.5 million and will be recognized over the requisite service period of approximately 1.7 years. On November 8, 2017, the Company signed a new, five-year supply agreement with Proterra Inc. to produce composite bus bodies at the Company’s existing Rhode Island manufacturing facility and from a new facility in Newton, Iowa that the Company expects to open in the first half of 2018.

Summary of Operations and Sig20

Summary of Operations and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Description of Business	Description of Business TPI Composites, Inc. is the holding company that conducts substantially all of its business operations through its direct and indirect subsidiaries (collectively, the Company). The Company was founded in 1968 and has been producing composite wind blades since 2001. The Company’s knowledge and experience of composite materials and manufacturing originates with its predecessor company, Tillotson Pearson Inc., a leading manufacturer of high-performance sail and powerboats along with a wide range of composite structures used in other industrial applications. Following the separation from the boat building business in 2004, the Company reorganized in Delaware as LCSI Holding, Inc. and then changed its corporate name to TPI Composites, Inc. in 2008. Today, the Company is headquartered in Scottsdale, Arizona and has expanded its global footprint to include domestic facilities in Newton, Iowa; Fall River, Massachusetts; Warren, Rhode Island and Santa Teresa, New Mexico and international facilities in Dafeng, China; Taicang Port, China; Taicang City, China; Juárez, Mexico and Izmir, Turkey. In April 2017, the Company entered into a new lease agreement with a third party for a new manufacturing facility in Matamoros, Mexico, and the Company expects to commence operations at this facility in the second half of 2018.
Initial Public Offering and Stock Split	Initial Public Offering and Stock Split In July 2016, the Company completed an initial public offering (IPO) of 7,187,500 shares of the Company’s common stock at a price of $11.00 per share, which included 937,500 shares issued pursuant to the underwriters’ over-allotment option. Certain of the Company’s existing shareholders, a director and executive officers purchased an aggregate of 1,250,000 shares of common stock in the IPO included in the total issuance above. The net proceeds from the IPO were $67.2 million after deducting underwriting discounts and offering expenses. Immediately prior to the closing of the IPO, all shares of the then-outstanding redeemable preferred shares converted into an aggregate of 21,110,204 shares of common stock and the redeemable preferred share warrants converted on a net issuance basis into 120,923 shares of common stock. In addition, concurrent with the closing of the IPO, certain subordinated convertible promissory notes in the aggregate principal and interest amount of $11.9 million were converted into 1,079,749 shares of common stock at the public offering price of $11.00 per share. Prior to the IPO, in July 2016 the Company amended its amended and restated certificate of incorporation to effect a 360-for-1 forward stock split of its common stock. As a result of the stock split, the Company has adjusted the share amounts authorized and issuable under the share-based compensation plans. All share and per share common stock information (including the share-based compensation plans) referenced throughout the unaudited condensed consolidated financial statements and notes thereto have been retroactively adjusted to reflect this stock split. The stock split did not cause an adjustment to the par value of the authorized shares of common stock.
Secondary Public Offering	Secondary Public Offering In May 2017, the Company completed a secondary public offering of 5,075,000 shares of its common stock at a price of $16.35 per share, which included 575,000 shares issued pursuant to the underwriters’ option to purchase additional shares. All of the shares were sold by existing shareholders and certain executive officers of the Company. The selling shareholders received all of the net proceeds of $78.8 million from the secondary public offering. The Company did not sell any shares and did not receive any of the proceeds from the offering and the costs paid by the Company in connection with the offering of $0.8 million were recorded in general and administrative costs in the accompanying condensed consolidated income statement.
Basis of Presentation	Basis of Presentation The Company divides its business operations into four geographic operating segments—the United States, Asia, Mexico and Europe, the Middle East and Africa (EMEA) as follows: • The U.S. segment includes (1) the manufacturing of wind blades at the Newton, Iowa plant, (2) the manufacturing of precision molding and assembly systems used for the manufacture of wind blades in the Warren, Rhode Island facility, (3) the manufacturing of composite solutions for the transportation industry, which the Company also conducts in its Rhode Island and Massachusetts facilities and (4) its corporate headquarters, the costs of which are included in general and administrative expenses. • The Asia segment includes (1) the manufacturing of wind blades at a facility in Taicang Port, China and at its two facilities in Dafeng, China, (2) the manufacturing of precision molding and assembly systems in the Taicang City, China facility, (3) the manufacture of components in a second Taicang Port, China facility and (4) wind blade inspection and repair services. • The Mexico segment manufactures wind blades from three facilities in Juárez, Mexico, one of which commenced operations in 2014, the second during the third quarter of 2016 and the third in January 2017. In April 2017, the Company entered into a new lease agreement with a third party for a new manufacturing facility in Matamoros, Mexico and the Company expects to commence operations at this facility in the second half of 2018. • The EMEA segment manufactures wind blades from two facilities in Izmir, Turkey. The Company entered into a joint venture in 2012 to produce wind blades at the first Turkey plant and in 2013 became the sole owner of the Turkey operation with the acquisition of the remaining 25% interest. The EMEA segment commenced operations in the second facility during the third quarter of 2016. The accompanying consolidated financial statements include the accounts of TPI Composites, Inc. and all majority owned subsidiaries. All significant intercompany transactions and balances have been eliminated. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the SEC and should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (GAAP) have been condensed or omitted, as permitted by the SEC, although the Company believes the disclosures that are made are adequate to make the information presented herein not misleading. The accompanying condensed consolidated financial statements reflect, in the opinion of management, all normal recurring adjustments necessary to present fairly the Company’s financial position at September 30, 2017, and the results of the Company’s operations, comprehensive income and cash flows for the periods presented. The Company derived the December 31, 2016 condensed consolidated balance sheet data from audited financial statements, but does not include all disclosures required by GAAP. Interim results for the three and nine months ended September 30, 2017 and 2016 are not necessarily indicative of the results to be expected for the full years.
Warranty Expense	Warranty Expense The Company provides a limited warranty for its mold and wind blade products, including parts and labor, with terms and conditions that vary depending on the product sold, for periods that range from two to five years. Warranty expense is recorded based upon estimates of future repairs using a probability-based methodology. Once the warranty period has expired, any remaining unused warranty accrual for the specific products is reversed against the current year warranty expense amount. Warranty accrual at September 30 consisted of the following (in thousands): 2017 Warranty accrual at beginning of year $ 19,912 Accrual during the period 10,696 Cost of warranty services provided during the period (372 ) Reversal of reserves upon warranty expiration (2,086 ) Warranty accrual at end of period $ 28,150
Treasury Stock	Treasury Stock Common stock purchased for treasury is recorded at historical cost. Transactions in treasury shares are primarily related to share-based compensation plans and are recorded at weighted-average cost.
Net Income Attributable to Preferred Shareholders	Net Income Attributable to Preferred Shareholders Net income attributable to preferred shareholders related to the accrual of dividends on previously outstanding convertible and senior redeemable preferred shares, the accretion to redemption amounts on the convertible preferred shares and warrant fair value adjustment. Immediately prior to the closing of the Company’s IPO, all preferred shares were converted into shares of the Company’s common stock and as a result, the accrual of dividends ceased.
Net Income Per Share Calculation	Net Income Per Share Calculation The basic net income per common share is computed by dividing the net income by the weighted-average number of common shares outstanding during a period. Diluted net income per common share is computed by dividing the net income Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Basic weighted-average shares outstanding 33,891 27,284 33,789 12,042 Effect of dilutive stock options and warrants 1,124 91 959 91 Diluted weighted-average shares outstanding 35,015 27,375 34,748 12,133 The Company did not have any potentially dilutive securities outstanding that are not included in the diluted net income per share calculation for the three and nine months ended September 30, 2017 and 2016.
Use of Estimates	Use of Estimates The preparation of these condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Accounting Pronouncements Adopted in 2017 In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-09, Compensation – Stock Compensation: Improvement to Employee Share-Based Payment Accounting The Company adopted ASU 2016-09 in the first quarter of 2017 using the modified retrospective transition method through a cumulative effect adjustment to equity as of January 1, 2017. Upon adoption, the Company elected to eliminate application of a forfeiture assumption to share based compensation expense and account for forfeitures as they occur over the vesting period. The cumulative effect of this change increased additional paid-in capital and decreased retained earnings as of January 1, 2017 by $1.1 million. The Company did not have any previously unrecognized excess tax effects that had not been recorded as a reduction to the tax liability. The Company did not recognize any excess tax benefits from the vesting of restricted stock units and stock options which were later exercised during the three and nine months ended September 30, 2017 due to the valuation allowance recorded against the U.S. federal and state deferred tax assets. The provisions of the standard relating to the cash flow presentation and income taxes are included in the accompanying statements of cash flows and income statements for applicable periods presented in the accompanying financial statements. If or when the valuation allowance recorded against the U.S. federal and state deferred tax assets is released, the inclusion of excess tax benefits and deficiencies as a component of the Company’s income tax expense in future periods will increase volatility within the provision for income taxes as the amount of excess tax benefits or deficiencies from share-based compensation awards are dependent on the Company’s stock price at the date the restricted awards vest, the stock price on the date an option is exercised and the quantity of options exercised. Revenue from Contracts with Customers In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers The new requirements are effective for the Company beginning January 1, 2018, and may be implemented either retrospectively for all periods presented, or as a cumulative-effect adjustment as of the date of adoption. The Company will adopt Topic 606 as of January 1, 2018 with retrospective application to January 1, 2015 through December 31, 2017. Based on the Company’s evaluation of the new standard, revenue recognition in accordance with Topic 606 differs from the current guidance provided by GAAP as outlined in the SEC’s Staff Accounting Bulletin 104, which requires the Company to defer recognition of revenue until the risk of loss has passed to the customer and delivery has been made or a fixed delivery schedule has been provided by the customer. Since the Company’s products have no alternative use to the Company due to contractual restrictions placed by each customer on the technical specifications and design of the products, the Company’s assessment is that revenue upon adoption of Topic 606 will be recognized over time during the course of the production process and before the product is delivered to the customer. The Company expects that the adoption of Topic 606 will have a material impact on the amount of net sales, cost of goods sold and income from operations reported in the consolidated income statements in future periods. In accordance with Topic 606, revenues will be recognized over the time period of the production process, whereas currently it is recognized upon delivery to the customer. Further, since revenue will be recognized over time for manufacturing contracts, future net sales will include amounts related to products that are in production as of the period end. Finally, the gross margin realized in the period may be impacted by the changes related to the timing and amount of revenue recognized for products in the production process. Although Topic 606 does not have a cash impact nor an effect on the economics of the Company's underlying customer contracts, applying Topic 606 to contracts in startup and transition will likely result in higher reported earnings in 2018 than under the previous guidance as revenue is shifted to the initial years of startup and transition activities of a contract. Topic 606 will not change the total amount of revenue recognized under the Company’s long-term supply contracts, only accelerate the timing of when the revenue is recognized. The Company expects a corresponding acceleration in timing of cost of goods sold recognition for these contracts upon adoption of Topic 606. The changes noted above involving the timing of revenue recognition will materially impact the amount of reported assets and liabilities on the consolidated balance sheet associated with the Company’s manufacturing contracts. Upon adoption of Topic 606, the Company will include amounts recognized in revenue for products in production as contract assets on the consolidated balance sheet, which differs from the current practice of including the balances in inventory, and will include an amount for the margin recognized to date. The Company will no longer report inventory held for customer orders since revenue will be recognized over time during the course of the production process and before the product is delivered to the customer. Work performed as production takes place will lead to revenue recognition and be included in the consolidated balance sheet under contract assets until billed. The Company expects that contract liabilities will be reported for amounts collected from customers in advance of the production of products. The Company also expects that the amount of deferred revenue will be substantially reduced as revenue for products will be recognized over time. The Company does not anticipate a change in the timing of cash receipts and payments from customers as customers will continue to be invoiced as products are completed. In addition, the Company does not expect changes to the aggregate amount of cash flows from operating activities in the consolidated statements of cash flows; however, the impact of changes in the captions on the consolidated balance sheet will have a material effect on the captions within cash flows from operating activities in the consolidated statements of cash flows. The Company has a project plan in place for the transition to revenue recognition in accordance with Topic 606 including necessary changes to accounting processes and procedures, the chart of accounts, the system of internal control and retrospective application of the standard to periods beginning January 1, 2015 through December 31, 2017. The Company expects to complete the plan in time to report in accordance with Topic 606 for the first quarterly filing on Form 10-Q for the period ended March 31, 2018.
Cash Flow Presentation	Cash Flow Presentation In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments Restricted Cash
Leases	Leases In February 2016, the FASB issued ASU 2016-02, Leases
Financial Instruments

Summary of Operations and Sig21

Summary of Operations and Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Warranty Accrual	Warranty accrual at September 30 consisted of the following (in thousands): 2017 Warranty accrual at beginning of year $ 19,912 Accrual during the period 10,696 Cost of warranty services provided during the period (372 ) Reversal of reserves upon warranty expiration (2,086 ) Warranty accrual at end of period $ 28,150
Calculation Of Weighted-Average Number Of Common Shares Outstanding	The table below reflects the calculation of the weighted-average number of common shares outstanding Three Months Ended Nine Months Ended September 30, September 30, 2017 2016 2017 2016 Basic weighted-average shares outstanding 33,891 27,284 33,789 12,042 Effect of dilutive stock options and warrants 1,124 91 959 91 Diluted weighted-average shares outstanding 35,015 27,375 34,748 12,133

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of Accounts Receivable	Accounts receivable consisted of the following (in thousands): September 30, December 31, 2017 2016 Trade accounts receivable $ 130,578 $ 66,612 Other accounts receivable 3,880 1,230 Total accounts receivable $ 134,458 $ 67,842

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2017
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following (in thousands): September 30, December 31, 2017 2016 Raw materials $ 30,260 $ 29,278 Work in process 27,122 21,169 Finished goods 3,211 2,648 Total inventories $ 60,593 $ 53,095

Property, Plant, and Equipmen24

Property, Plant, and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Schedule of Property Plant and Equipment Net	Property, plant and equipment, net consisted of the following (in thousands): September 30, December 31, 2017 2016 Machinery and equipment $ 92,938 $ 70,481 Buildings 14,603 13,449 Leasehold improvements 21,518 16,818 Office equipment and software 11,061 6,403 Furniture 20,235 15,883 Vehicles 341 342 Construction in progress 16,472 11,592 Total 177,168 134,968 Accumulated depreciation (57,533 ) (43,802 ) Property, plant and equipment, net $ 119,635 $ 91,166

Long-Term Debt, Net of Debt I25

Long-Term Debt, Net of Debt Issuance Costs and Current Maturities (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Long-Term Debt, Net of Debt Issuance Costs and Current Maturities	Long-term debt, net of debt issuance costs and current maturities, consisted of the following (in thousands): September 30, December 31, 2017 2016 Senior term loan—U.S. $ 72,188 $ 75,000 Senior revolving loan—U.S. 2,820 2,820 Accounts receivable financing—EMEA 23,316 15,120 Unsecured financing—EMEA — 4,638 Equipment financing—EMEA 17,704 15,813 Equipment capital lease—Mexico 14,731 8,037 Equipment capital lease—U.S. 867 2,016 Equipment capital lease—EMEA 3,810 1,898 Equipment loan—Mexico 61 103 Total long-term debt 135,497 125,445 Less: Debt issuance costs (1,860 ) (2,290 ) Total long-term debt, net of debt issuance costs 133,637 123,155 Less: Current maturities of long-term debt (44,498 ) (33,403 ) Long-term debt, net of debt issuance costs and current maturities $ 89,139 $ 89,752

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Activity of Stock Options and RSUs	The following table summarizes the activity of the stock options and RSUs under the Company’s incentive plans: Stock Options RSUs Shares Available for Grant Shares Weighted- Average Exercise Price Options Exercisable Units Weighted- Average Grant Date Fair Value Balance as of December 31, 2016 3,587,692 3,331,418 $ 12.72 25,828 636,120 $ 10.90 Increase in shares authorized 1,349,475 — — — — Granted (190,290 ) 161,090 20.00 29,200 16.69 Exercised/vested — (107,527 ) 10.81 (218,040 ) 10.95 Forfeited/cancelled 227,650 (202,450 ) 11.54 (25,200 ) 10.87 Balance as of September 30, 2017 4,974,527 3,182,531 13.23 729,196 422,080 11.27
Summary of Outstanding and Exercisable Stock Option Awards	The following table summarizes the outstanding and exercisable stock option awards as of September 30, 2017: Options Outstanding Options Exercisable Range of Exercise Prices: Shares Weighted- Average Remaining Contractual Life ( in years Weighted- Average Exercise Price Shares Weighted- Average Exercise Price $8.49 22,728 2.3 $ 8.49 22,728 $ 8.49 $ 10.87 2,004,700 7.7 10.87 465,700 10.87 $11.00 to $16.53 656,523 8.3 16.12 157,072 16.33 $18.70 342,790 8.7 18.68 83,696 18.70 $20.05 to $22.34 155,790 9.9 20.14 — — $8.49 to $22.34 3,182,531 8.0 13.23 729,196 12.87

Concentration of Customers (Tab

Concentration of Customers (Tables)	9 Months Ended
	Sep. 30, 2017
Risks And Uncertainties [Abstract]
Schedule of Revenues from Customers	Revenues from certain customers in excess of 10 percent of total consolidated Company revenues (dollars in thousands) are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Customer Revenues % of Total Revenues % of Total Revenues % of Total Revenues % of Total GE $ 99,623 40.9 % $ 98,141 49.3 % $ 286,941 42.0 % $ 292,435 51.4 % Vestas 69,125 28.4 50,300 25.3 195,556 28.6 120,716 21.2 Nordex Group 46,998 19.3 31,132 15.6 119,530 17.5 96,139 16.9 Gamesa 23,820 9.8 17,844 9.0 71,405 10.5 54,553 9.6 Other 3,788 1.6 1,521 0.8 9,710 1.4 5,460 0.9 Total $ 243,354 100.0 % $ 198,938 100.0 % $ 683,142 100.0 % $ 569,303 100.0 %
Schedule of Trade Accounts Receivable from Certain Customers	Trade accounts receivable from certain customers in excess of 10 percent of total consolidated Company trade accounts receivable are as follows: September 30, December 31, 2017 2016 Customer % of Total % of Total GE 17.1 % 24.9 % Vestas 42.7 % 26.2 % Nordex Group 28.0 % 26.8 % Gamesa 8.7 % 16.2 %

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Information	The following tables set forth certain information (in thousands) regarding each of the Company’s segments: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Revenues by segment: U.S. $ 44,599 $ 45,090 $ 136,314 $ 141,920 Asia 102,463 86,834 278,284 232,639 Mexico 44,941 35,448 134,010 88,623 EMEA 51,351 31,566 134,534 106,121 Total revenues $ 243,354 $ 198,938 $ 683,142 $ 569,303 Revenues by geographic location (1): U.S. $ 44,599 $ 45,090 $ 136,314 $ 141,920 China 102,463 86,834 278,284 232,639 Mexico 44,941 35,448 134,010 88,623 Turkey 51,351 31,566 134,534 106,121 Total revenues $ 243,354 $ 198,938 $ 683,142 $ 569,303 Income (loss) from operations: U.S. (2) $ (8,120 ) $ (12,929 ) $ (26,247 ) $ (18,052 ) Asia 24,031 17,291 64,191 48,055 Mexico 3,286 3,574 5,254 6,197 EMEA 4,349 201 13,861 (2,396 ) Total income from operations $ 23,546 $ 8,137 $ 57,059 $ 33,804 September 30, December 31, 2017 2016 Property, plant and equipment, net: U.S. $ 21,693 $ 16,740 Asia (China) 29,262 26,341 Mexico 40,359 24,842 EMEA (Turkey) 28,321 23,243 Total property, plant and equipment, net $ 119,635 $ 91,166 (1) Revenues are attributable to countries based on the location where the product is manufactured or the services are performed. (2) The losses from operations in the U.S. segment includes corporate general and administrative costs of $9.3 million and $14.1 million for the three months ended September 30, 2017 and 2016, respectively, and $28.4 million and $24.2 million for the nine months ended September 30, 2017 and 2016, respectively.

Summary of Operations and Sig29

Summary of Operations and Significant Accounting Policies - Additional Information (Detail)	1 Months Ended		3 Months Ended		9 Months Ended
	May 31, 2017USD ($)$ / sharesshares	Jul. 31, 2016USD ($)$ / sharesshares	Sep. 30, 2017USD ($)Facilityshares	Sep. 30, 2016shares	Sep. 30, 2017USD ($)SegmentFacilityshares	Sep. 30, 2016USD ($)shares	Jan. 01, 2017USD ($)	Dec. 31, 2013
Operations And Summary Of Significant Accounting Policies [Line Items]
Net proceeds from Initial public offering | $						$ 67,199,000
Conversion of convertible promissory notes | $						$ 11,877,000
Number of operating segments | Segment					4
Potentially dilutive securities outstanding			0	0	0	0
Excess tax benefits from vesting of restricted stock units and stock options | $			$ 0		$ 0
ASU 2016-09 [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect of change in increased additional paid-in capital and decreased in retained earnings | $							$ 1,100,000
Minimum [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Limited warranty period					2 years
Maximum [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Limited warranty period					5 years
Asia [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of manufacturing facilities | Facility			2		2
Mexico [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of manufacturing facilities | Facility			3		3
EMEA [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of manufacturing facilities | Facility			2		2
Joint venture remaining ownership percentage acquired								25.00%
Initial Public Offering [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares		7,187,500
Share price | $ / shares		$ 11
Net proceeds from Initial public offering | $		$ 67,200,000
Conversion of convertible promissory notes | $		$ 11,900,000
Initial Public Offering [Member] | Subordinated Convertible Promissory Notes [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Share price | $ / shares		$ 11
Debt instrument convertible number of equity shares		1,079,749
Initial Public Offering [Member] | Common Stock Warrants [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of common stock issue on conversion of preferred share		120,923
Initial Public Offering [Member] | Redeemable Preferred Shares [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Number of common stock issue on conversion of preferred share		21,110,204
Initial Public Offering [Member] | Investors, Director and Executive Officers [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares		1,250,000
Underwriters Over-allotment Option [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares		937,500
Underwriters Over-allotment Option [Member] | Existing Shareholders and Executive Officers [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares	575,000
Prior to IPO [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Common stock forward stock split ratio		360
Secondary Public Offering [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares	0
Net proceeds from from secondary public offering to selling shareholders | $	$ 78,800,000
Proceeds from secondary public offering | $	0
Secondary Public Offering [Member] | General and Administrative Costs [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Offering costs paid | $	$ 800,000
Secondary Public Offering [Member] | Existing Shareholders and Executive Officers [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Public offering shares	5,075,000
Share price | $ / shares	$ 16.35

Summary of Operations and Sig30

Summary of Operations and Significant Accounting Policies - Summary of Warranty Accrual (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Product Warranties Disclosures [Abstract]
Warranty accrual at beginning of year	$ 19,912
Accrual during the period	10,696
Cost of warranty services provided during the period	(372)
Reversal of reserves upon warranty expiration	(2,086)
Warranty accrual at end of period	$ 28,150

Summary of Operations and Sig31

Summary of Operations and Significant Accounting Policies - Calculation Of Weighted-Average Number Of Common Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding	33,891	27,284	33,789	12,042
Effect of dilutive stock options and warrants	1,124	91	959	91
Diluted weighted-average shares outstanding	35,015	27,375	34,748	12,133

Significant Risks and Uncerta32

Significant Risks and Uncertainties - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
U.S. [Member]
Concentration Risk [Line Items]
Cash in deposit accounts	$ 105,600,000	$ 103,400,000
China [Member]
Concentration Risk [Line Items]
Cash in deposit accounts	31,500,000
Turkey [Member]
Concentration Risk [Line Items]
Cash in deposit accounts	1,200,000
Mexico [Member]
Concentration Risk [Line Items]
Cash in deposit accounts	800,000
Maximum [Member]
Concentration Risk [Line Items]
Cash deposit insured amount	$ 250,000	$ 250,000

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended	9 Months Ended
	May 31, 2017$ / sharesshares	Jul. 31, 2016$ / sharesshares	Sep. 30, 2017Agreement	Sep. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Sep. 30, 2017	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Jan. 31, 2016USD ($)
Initial Public Offering [Member]
Related Party Transaction [Line Items]
Public offering shares		7,187,500
Share price | $ / shares		$ 11
Secondary Public Offering [Member]
Related Party Transaction [Line Items]
Public offering shares	0
Investor, Executive Officers and Director [Member] | Initial Public Offering [Member]
Related Party Transaction [Line Items]
Public offering shares		1,250,000
Subordinated Convertible Promissory Notes [Member] | Initial Public Offering [Member]
Related Party Transaction [Line Items]
Debt instrument convertible number of equity shares		1,079,749
Share price | $ / shares		$ 11
GE [Member]
Related Party Transaction [Line Items]
Number of supply agreements | Agreement			5
Proceeds from related party sales | $				$ 98.1	$ 187.3		$ 292.4
Accounts receivables, related party | $					$ 26.7			$ 16.6
Advance received | $									$ 2
GE [Member] | Agreements in Taicang Port and Izmir [Member]
Related Party Transaction [Line Items]
Agreement expiration date						Dec. 31, 2017
GE [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Percentage of common stock outstanding					5.00%
Certain Entities Associated with Element Partners, Angeleno Group Landmark Partners and NGP Energy Technology Partners, L.P and Certain Executive Officers [Member] | Secondary Public Offering [Member]
Related Party Transaction [Line Items]
Public offering shares	5,075,000
Share price | $ / shares	$ 16.35

Accounts Receivable - Summary o

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 134,458	$ 67,842
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	130,578	66,612
Other Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 3,880	$ 1,230

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 30,260	$ 29,278
Work in process	27,122	21,169
Finished goods	3,211	2,648
Total inventories	$ 60,593	$ 53,095

Property, Plant, and Equipmen36

Property, Plant, and Equipment, Net - Schedule of Property Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 177,168	$ 134,968
Accumulated depreciation	(57,533)	(43,802)
Property, plant and equipment, net	119,635	91,166
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	92,938	70,481
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,603	13,449
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,518	16,818
Office Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,061	6,403
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,235	15,883
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	341	342
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 16,472	$ 11,592

Property, Plant, and Equipmen37

Property, Plant, and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property Plant And Equipment [Abstract]
Total depreciation expense	$ 5.1	$ 3.5	$ 13.5	$ 9.7

Long-Term Debt, Net of Debt I38

Long-Term Debt, Net of Debt Issuance Costs and Current Maturities - Schedule of Long-Term Debt, Net of Debt Issuance Costs and Current Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Total long-term debt
Total long-term debt	$ 135,497	$ 125,445
Less: Debt issuance costs	(1,860)	(2,290)
Total long-term debt, net of debt issuance costs	133,637	123,155
Less: Current maturities of long-term debt	(44,498)	(33,403)
Long-term debt, net of debt issuance costs and current maturities	89,139	89,752
Senior Term Loan [Member] | U.S. [Member]
Total long-term debt
Total long-term debt	72,188	75,000
Senior Revolving Loan [Member] | U.S. [Member]
Total long-term debt
Total long-term debt	2,820	2,820
Accounts Receivable Financing [Member] | EMEA [Member]
Total long-term debt
Total long-term debt	23,316	15,120
Unsecured Financing [Member] | EMEA [Member]
Total long-term debt
Total long-term debt		4,638
Equipment Financing [Member] | EMEA [Member]
Total long-term debt
Total long-term debt	17,704	15,813
Equipment Capital Lease [Member] | Mexico [Member]
Total long-term debt
Total long-term debt	14,731	8,037
Equipment Capital Lease [Member] | U.S. [Member]
Total long-term debt
Total long-term debt	867	2,016
Equipment Capital Lease [Member] | EMEA [Member]
Total long-term debt
Total long-term debt	3,810	1,898
Equipment Loan [Member] | Mexico [Member]
Total long-term debt
Total long-term debt	$ 61	$ 103

Share-Based Compensation Plan39

Share-Based Compensation Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 1,000,000		$ 4,800,000
Share-based compensation capitalized costs	0	$ 0	$ 0	$ 0
2015 Stock Option and Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
2015 Stock Option and Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Restricted Stock Unit (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year 3 months 19 days
Total share-based compensation expense	400,000		$ 1,500,000
Unamortized amount of share-based compensation expense	1,800,000		$ 1,800,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year 10 months 25 days
Total share-based compensation expense	600,000		$ 3,300,000
Total unrecognized cost related to unvested stock option awards	5,300,000		5,300,000
Cost of Goods Sold [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	200,000		800,000
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 800,000		$ 4,000,000

Share-Based Compensation Plan40

Share-Based Compensation Plans - Summary of Activity of Stock Options and RSUs (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, Shares Available for Grant, Beginning balance	3,587,692
Stock Options, Shares Available for Grant, Increase in shares authorized	1,349,475
Stock Options, Shares Available for Grant, Granted	(190,290)
Stock Options, Shares Available for Grant, Exercised/vested	0
Stock Options, Shares Available for Grant, Forfeited/cancelled	227,650
Stock Options, Shares Available for Grant, Ending balance	4,974,527
Stock Options, Shares, Beginning balance	3,331,418
Stock Options, Shares, Increase in shares authorized	0
Stock Options, Shares, Granted	161,090
Stock Options, Shares, Exercised/vested	(107,527)
Stock Options, Shares, Forfeited/cancelled	(202,450)
Stock Options, Shares, Ending balance	3,182,531
Stock Options, Weighted-Average Exercise Price, Beginning balance	$ 12.72
Stock Options, Weighted-Average Exercise Price, Increase in shares authorized	0
Stock Options, Weighted-Average Exercise Price, Granted	20
Stock Options, Weighted-Average Exercise Price, Exercised/vested	10.81
Stock Options, Weighted-Average Exercise Price, Forfeited/cancelled	11.54
Stock Options, Weighted-Average Exercise Price, Ending balance	$ 13.23
Stock Options, Options Exercisable	729,196	25,828
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs, Units, Beginning balance	636,120
RSUs, Units, Increase in shares authorized	0
RSUs, Units, Granted	29,200
RSUs, Units, Exercised/vested	(218,040)
RSUs, Units, Forfeited/cancelled	(25,200)
RSUs, Units, Ending balance	422,080
RSUs, Weighted-Average Grant Date Fair Value, Beginning balance	$ 10.90
RSUs, Weighted-Average Grant Date Fair Value, Increase in shares authorized	0
RSUs, Weighted-Average Grant Date Fair Value, Granted	16.69
RSUs, Weighted-Average Grant Date Fair Value, Exercised/vested	10.95
RSUs, Weighted-Average Grant Date Fair Value, Forfeited/cancelled	10.87
RSUs, Weighted-Average Grant Date Fair Value, Ending balance	$ 11.27

Share-Based Compensation Plan41

Share-Based Compensation Plans - Summary of Outstanding and Exercisable Stock Option Awards (Detail)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 8.49
Range of Exercise Prices, Maximum	$ 22.34
Options Outstanding, Shares | shares	3,182,531
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years
Options Outstanding, Weighted-Average Exercise Price	$ 13.23
Options Exercisable, Shares | shares	729,196
Options Exercisable, Weighted-Average Exercise Price	$ 12.87
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 8.49
Options Outstanding, Shares | shares	22,728
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 8.49
Options Exercisable, Shares | shares	22,728
Options Exercisable, Weighted-Average Exercise Price	$ 8.49
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 10.87
Options Outstanding, Shares | shares	2,004,700
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 10.87
Options Exercisable, Shares | shares	465,700
Options Exercisable, Weighted-Average Exercise Price	$ 10.87
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	11
Range of Exercise Prices, Maximum	$ 16.53
Options Outstanding, Shares | shares	656,523
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 3 months 19 days
Options Outstanding, Weighted-Average Exercise Price	$ 16.12
Options Exercisable, Shares | shares	157,072
Options Exercisable, Weighted-Average Exercise Price	$ 16.33
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 18.70
Options Outstanding, Shares | shares	342,790
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 18.68
Options Exercisable, Shares | shares	83,696
Options Exercisable, Weighted-Average Exercise Price	$ 18.70
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	20.05
Range of Exercise Prices, Maximum	$ 22.34
Options Outstanding, Shares | shares	155,790
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	9 years 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 20.14

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Line Items]
Income tax expense	$ 371	$ 309	$ 8,514	$ 4,565
Turkey [Member]
Income Tax Disclosure [Line Items]
Non-cash benefit resulted from foreign operations	2,600
Non-cash benefit related to future earnings	1,200
New tax incentives received from foreign operations	$ 1,800

Concentration of Customers - Ad

Concentration of Customers - Additional Information (Detail) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Sales Revenues [Member]
Concentration Risk [Line Items]
Customer risk percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenues [Member] | Minimum [Member]
Concentration Risk [Line Items]
Customer risk percentage	10.00%	10.00%	10.00%	10.00%
Accounts Receivable [Member] | Minimum [Member]
Concentration Risk [Line Items]
Customer risk percentage			10.00%		10.00%

Concentration of Customers - Sc

Concentration of Customers - Schedule of Revenues from Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Concentration Risk [Line Items]
Revenues	$ 243,354	$ 198,938	$ 683,142	$ 569,303
Sales Revenues [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 243,354	$ 198,938	$ 683,142	$ 569,303
Percentage of Total	100.00%	100.00%	100.00%	100.00%
Sales Revenues [Member] | GE [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 99,623	$ 98,141	$ 286,941	$ 292,435
Percentage of Total	40.90%	49.30%	42.00%	51.40%
Sales Revenues [Member] | Vestas [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 69,125	$ 50,300	$ 195,556	$ 120,716
Percentage of Total	28.40%	25.30%	28.60%	21.20%
Sales Revenues [Member] | Nordex Group [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 46,998	$ 31,132	$ 119,530	$ 96,139
Percentage of Total	19.30%	15.60%	17.50%	16.90%
Sales Revenues [Member] | Gamesa [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 23,820	$ 17,844	$ 71,405	$ 54,553
Percentage of Total	9.80%	9.00%	10.50%	9.60%
Sales Revenues [Member] | Other [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 3,788	$ 1,521	$ 9,710	$ 5,460
Percentage of Total	1.60%	0.80%	1.40%	0.90%

Concentration of Customers - 45

Concentration of Customers - Schedule of Trade Accounts Receivable from Certain Customers (Detail) - Accounts Receivable [Member] - Customer Concentration Risk [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
GE [Member]
Concentration Risk [Line Items]
Percentage of Total	17.10%	24.90%
Vestas [Member]
Concentration Risk [Line Items]
Percentage of Total	42.70%	26.20%
Nordex Group [Member]
Concentration Risk [Line Items]
Percentage of Total	28.00%	26.80%
Gamesa [Member]
Concentration Risk [Line Items]
Percentage of Total	8.70%	16.20%

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017Segment
Segment Reporting [Abstract]
Number of reportable segments	4

Segment Reporting - Schedule of

Segment Reporting - Schedule of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 243,354	$ 198,938	$ 683,142	$ 569,303
Total income from operations	23,546	8,137	57,059	33,804
Total property, plant and equipment, net	119,635		119,635		$ 91,166
U.S. Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	44,599	45,090	136,314	141,920
Total income from operations	(8,120)	(12,929)	(26,247)	(18,052)
Total property, plant and equipment, net	21,693		21,693		16,740
Asia Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	102,463	86,834	278,284	232,639
Total income from operations	24,031	17,291	64,191	48,055
Total property, plant and equipment, net	29,262		29,262		26,341
Mexico Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	44,941	35,448	134,010	88,623
Total income from operations	3,286	3,574	5,254	6,197
Total property, plant and equipment, net	40,359		40,359		24,842
EMEA Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	51,351	31,566	134,534	106,121
Total income from operations	4,349	201	13,861	(2,396)
Total property, plant and equipment, net	28,321		28,321		$ 23,243
U.S. [Member]
Segment Reporting Information [Line Items]
Total revenues	44,599	45,090	136,314	141,920
China [Member]
Segment Reporting Information [Line Items]
Total revenues	102,463	86,834	278,284	232,639
Mexico [Member]
Segment Reporting Information [Line Items]
Total revenues	44,941	35,448	134,010	88,623
Turkey [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 51,351	$ 31,566	$ 134,534	$ 106,121

Segment Reporting - Schedule 48

Segment Reporting - Schedule of Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
General and administrative costs	$ 9,315	$ 14,065	$ 28,373	$ 24,154
U.S. Segment [Member]
Segment Reporting Information [Line Items]
General and administrative costs	$ 9,300	$ 14,100	$ 28,400	$ 24,200

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions	Nov. 08, 2017	Oct. 31, 2017	Sep. 30, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Supply agreement term	5 years
Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
RSU granted			29,200
Total share-based compensation expense estimated for RSU			$ 1.8
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Certain Employees [Member]
Subsequent Event [Line Items]
RSU granted		191,300
Total share-based compensation expense estimated for RSU		$ 4.5
Total share-based compensation expense, recognition period		1 year 8 months 13 days
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Certain Employees [Member] | Vesting on March 7, 2018 [Member]
Subsequent Event [Line Items]
Awards vesting percentage		20.00%
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Certain Employees [Member] | Vesting on March 7, 2019 [Member]
Subsequent Event [Line Items]
Awards vesting percentage		30.00%
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Certain Employees [Member] | Vesting on March 7, 2020 [Member]
Subsequent Event [Line Items]
Awards vesting percentage		50.00%