Neophotonics (NPTN) 10-Q 9 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	NPTN
Entity Registrant Name	NEOPHOTONICS CORP
Entity Central Index Key	1,227,025
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		43,638,809

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 73,661	$ 82,500
Short-term investments	2,055	19,015
Restricted cash	3,290	4,085
Accounts receivable, net of allowance for doubtful accounts	56,525	80,610
Inventories	81,328	48,237
Assets held for sale		13,953
Prepaid expenses and other current assets	36,766	22,396
Total current assets	253,625	270,796
Property, plant and equipment, net	125,102	106,867
Purchased intangible assets, net	4,898	5,562
Goodwill	1,115	1,115
Other long-term assets	6,436	6,547
Total assets	391,176	390,887
Current liabilities:
Accounts payable	80,446	84,766
Notes payable and short-term borrowing	24,149	30,190
Current portion of long-term debt	5,458	747
Accrued and other current liabilities	40,725	30,625
Total current liabilities	150,778	146,328
Long-term debt, net of current portion	10,810	10,215
Other noncurrent liabilities	13,967	8,939
Total liabilities	175,555	165,482
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred stock, $0.0025 par value, 10,000 shares authorized, no shares issued or outstanding
Common stock, $0.0025 par value, 100,000 shares authorized, At June 30, 2017, 43,568 shares issued and outstanding; at December 31, 2016, 42,526 shares issued and outstanding	109	106
Additional paid-in capital	539,525	532,378
Accumulated other comprehensive loss	(4,472)	(8,401)
Accumulated deficit	(319,541)	(298,678)
Total stockholders' equity	215,621	225,405
Total liabilities and stockholders' equity	$ 391,176	$ 390,887

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0025	$ 0.0025
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0025	$ 0.0025
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	43,568	42,526
Common stock, shares outstanding	43,568	42,526

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 73,214	$ 99,129	$ 144,902	$ 198,274
Cost of goods sold	56,437	71,600	109,622	139,623
Gross profit	16,777	27,529	35,280	58,651
Operating expenses:
Research and development	14,206	11,780	29,750	24,732
Sales and marketing	3,910	3,807	8,842	7,738
General and administrative	7,729	7,841	19,155	16,925
Amortization of purchased intangible assets	118	460	236	913
Acquisition and asset sale related costs	21	775	151	775
Restructuring charges	494		721
Gain on asset sale			(2,000)
Total operating expenses	26,478	24,663	56,855	51,083
Income (loss) from operations	(9,701)	2,866	(21,575)	7,568
Interest income	31	77	104	132
Interest expense	(111)	(99)	(248)	(201)
Other income (expense), net	(11)	458	238	(846)
Total interest and other income (expense), net	(91)	436	94	(915)
Income (loss) before income taxes	(9,792)	3,302	(21,481)	6,653
Income tax (provision) benefit	451	(626)	618	(1,667)
Net income (loss)	$ (9,341)	$ 2,676	$ (20,863)	$ 4,986
Basic net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.12
Diluted net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.11
Weighted average shares used to compute basic net income (loss) per share	43,219	41,603	42,919	41,362
Weighted average shares used to compute diluted net income (loss) per share	43,219	44,320	42,919	44,042

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (9,341)	$ 2,676	$ (20,863)	$ 4,986
Other comprehensive income:
Foreign currency translation adjustments net of zero tax	1,445	(1,750)	3,913	314
Unrealized gains on available-for-sale securities, net of zero tax	13	4	16	33
Total other comprehensive income (loss)	1,458	(1,746)	3,929	347
Comprehensive income (loss)	$ (7,883)	$ 930	$ (16,934)	$ 5,333

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0
Unrealized gains on available-for-sale securities, tax	$ 0	$ 0	$ 0	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (20,863)	$ 4,986
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	13,298	11,137
Stock-based compensation expense	3,758	5,669
Deferred taxes	609
Amortization of investment, debt and other	122	94
(Gain) loss on sale of assets and other write-offs	(1,669)	48
Gain on foreign currency hedges	(1,070)
Allowance for doubtful accounts	92	(393)
Write-down of inventories	2,279	1,740
Foreign currency remeasurement and other, net	650	248
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	24,110	(3,288)
Inventories	(32,291)	1,892
Prepaid expenses and other assets	(14,803)	(501)
Accounts payable	2,451	8,224
Accrued and other liabilities	6,831	(6,678)
Net cash provided by (used in) operating activities	(16,496)	23,178
Cash flows from investing activities
Purchase of property, plant and equipment	(34,597)	(14,595)
Proceeds from sale of property, plant and equipment and other assets	21,784	19
Purchase of marketable securities	(41,807)	(47,807)
Proceeds from sale of marketable securities	52,271	34,682
Proceeds from maturity of marketable securities	6,458	8,000
Change in restricted cash	882	19
Settlement of foreign currency hedges	1,005
Net cash provided by (used in) investing activities	5,996	(19,682)
Cash flows from financing activities
Proceeds from exercise of stock options and issuance of stock under ESPP	3,136	3,538
Tax withholding on restricted stock units	(638)	(77)
Payments for public stock offering	(117)
Proceeds from bank loans, net of debt issuance costs	48,994	47,600
Repayment of bank loans	(48,045)	(48,047)
Proceeds from issuance of notes payable	4,235	9,217
Repayment of notes payable	(6,599)	(9,283)
Net cash provided by financing activities	966	2,948
Effect of exchange rates on cash and cash equivalents	695	(56)
Net increase (decrease) in cash and cash equivalents	(8,839)	6,388
Cash and cash equivalents at the beginning of the period	82,500	76,088
Cash and cash equivalents at the end of the period	73,661	82,476
Supplemental disclosure of noncash investing and financing activities:
Increase in unpaid property, plant and equipment	$ 6,342	$ (4,872)

Basis of presentation and signi

Basis of presentation and significant accounting policies	6 Months Ended
	Jun. 30, 2017
Basis of presentation and significant accounting policies
Basis of presentation and significant accounting policies	Note 1. Basis of presentation and significant accounting policies Basis of Presentation and Consolidation The condensed consolidated financial statements of NeoPhotonics Corporation (“NeoPhotonics” or the “Company”) as of June 30, 2017 and for the three and six months ended June 30, 2017 and 2016, have been prepared in accordance with the instructions on Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In accordance with those rules and regulations, the Company has omitted certain information and notes normally provided in the Company’s annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, consisting only of normal recurring items, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the interim periods. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”). These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results expected for the entire fiscal year. All intercompany accounts and transactions have been eliminated. Going Concern Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, requires an entity to disclose information about its potential inability to continue as a going concern when conditions and events indicate that it is probable that the entity may be unable to meet its obligations as they become due within one year. Management has assessed the Company’s ability to continue as a going concern within one year of the filing date of this Quarterly Report on Form 10-Q with the SEC in August 2017. The accompanying unaudited condensed financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. As of June 30, 2017, the Company’s working capital was $102.8 million including available cash, cash equivalents, short-term investments and restricted cash of approximately $79.0 million. In the first six months of 2017, the Company had operating losses of $21.6 million and negative cash flows from operations of $16.5 million. It had an accumulated deficit of approximately $319.5 million as of June 30, 2017. The Company has two credit agreements both of which are subject to renewal or expiration in the third quarter of 2017: a $30.0 million credit facility with Comerica Bank in the U.S. and a $39.2 million credit facility with CITIC Bank in China. As of June 30, 2017, the Company had $20.0 million debt outstanding under the Comerica facility and subsequent to the quarter end the Company borrowed $17.0 million from CITIC Bank. These amounts are due on August 31, 2017 and January 2, 2018, respectively. In addition, the Company’s forecasts for revenue from customers in China during the second half of 2017 have been reduced from prior levels as industry forecasts for the region’s telecom carriers deploying metro and provincial networks have been reduced in the near term. The Company must extend or replace one of the above-noted credit agreements in order to have sufficient resources to fund the Company’s currently planned operations and expenditures over the next twelve months. Management believes extending or replacing one of these credit agreements is probable; however, if this is unsuccessful, management intends to implement working capital management plans as described below. The Company implemented a restructuring plan in May 2017 to execute a range of cost saving measures that reduced and delayed spending in the second quarter of 2017. The Company intends to manage production and inventory levels, aggressively pursue collections, further reduce or delay product development projects and capital expenditures to conserve its cash resources. Additionally, the Company has $20.8 million of unused credit as part of a credit facility in China that is available to the Company until July 2019. If cash flows from such plans are insufficient to meet its cash flow needs over the next twelve months, the Company has developed a contingency plan. This contingency plan includes closing certain operations, eliminating some marketing and research and development programs and further reducing its administrative costs. The Company believes that it is probable that these plans can be effectively implemented and that it is probable these plans will mitigate issues that might arise within one year after these financial statements are issued should the Company be unable to extend or replace one of its existing credit agreements. The Company operates in an industry that makes its prospects difficult to evaluate with certainty. Future declines in China market demand or other changes to the Company’s forecasts could adversely affect the Company’s results of operations, financial position and cash flows. The Company may need to raise additional debt or equity capital to fund its operations in the next twelve months. Any additional debt arrangements may likely require regular interest payments which could adversely affect the Company’s operations. There can be no assurance that additional debt or equity capital will be available on acceptable terms, or at all, or that the Company’s revenue will reach a level sufficient to provide for self-sustaining cash flows. Although management believes it is probable that it will be able to satisfactorily complete these plans, if the Company is not successful in completing these plans it could raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying unaudited condensed financial statements do not include any adjustments that may result from the outcome of these uncertainties. Certain Significant Risks and Uncertainties The Company operates in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, any of the following areas could have a negative effect on the Company in terms of its future financial position, results of operations or cash flows: the general state of the U.S., China and world economies; the highly cyclical nature of the industries the Company serves; the loss of any of a small number of its larger customers; ability to obtain additional financing; inability to meet certain debt covenants; fundamental changes in the technology underlying the Company’s products; the hiring, training and retention of key employees; successful and timely completion of product design efforts; and new product design introductions by competitors. Concentration In the three months ended June 30, 2017, Huawei Technologies Co. Ltd. and their affiliate HiSilicon Technologies (together with Huawei Technologies Co. Ltd., “Huawei”) and Ciena Corporation (“Ciena”) accounted for approximately 37% and 19% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 89% of the Company’s total revenue. In the three months ended June 30, 2016, Huawei and Ciena accounted for approximately 45% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 91% of the Company’s total revenue. In the six months ended June 30, 2017, Huawei and Ciena each accounted for 39% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 89% of its total revenue. In the six months ended June 30, 2016, Huawei and Ciena each accounted for 49% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 91% of its total revenue. As of June 30, 2017, two customers accounted for approximately 36% and 12% of the Company’s accounts receivable. As of December 31, 2016, three customers accounted for approximately 42%, 12% and 12%, respectively, of the Company’s accounts receivable. Use of Estimates The preparation of financial statements in accordance with U.S. 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 financial statements and the reported revenue and expenses during the reporting period. Significant estimates made by management include: the useful lives of property, plant and equipment and intangible assets as well as future cash flows to be generated by those assets; fair values of identifiable assets acquired and liabilities assumed in business combinations; allowances for doubtful accounts; valuation allowances for deferred tax assets; valuation of excess and obsolete inventories; warranty reserves; litigation accrual and recognition of stock-based compensation, among others. Actual results could differ from these estimates. Accounting Standards Update Recently Adopted Effective January 1, 2017, the Company adopted ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies certain aspects of the accounting for shared-based payment transactions, including income taxes, classification of awards and classification on the statement of cash flows. It eliminates the requirement to delay the recognition of excess tax benefits until current taxes payable are reduced. Under this standard, previously unrecognized excess tax benefits shall be recognized on a modified retrospective basis. Upon adoption, the Company’s previously unrecognized excess tax benefits of $8.6 million had no impact on its accumulated deficit balance as the related U.S. deferred tax assets were fully offset by a valuation allowance. The Company elected to apply the change in presentation on the statements of cash flows prospectively and elected to continue to account for estimated forfeitures over the vest period of the shared-based awards. Effective January 1, 2017, the Company also adopted ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”). ASU 2015-11 requires entities to measure most inventories “at the lower of cost and net realizable value” but does not apply to inventories that are measured by using either the last-in, first-out method or the retail inventory method. The impact on the Company’s consolidated financial statements upon the adoption of this standard was immaterial. Effective December 31, 2016, the Company adopted ASU No. 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. (“ASU 2014-15”). Under the new standard, management must evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of management’s plans that have not been fully implemented as of the date the financial statements are issued. When substantial doubt exists under this methodology, management evaluates whether the mitigating effect of its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans, however, is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. This ASU requires management to perform an analysis of the Company’s ability to continue as a going concern as of the issue date of the financial statements. See Note 1 in Notes to Condensed Consolidated Financial Statements in Item 1 of Part I of this report – Basis of Presentation and Significant Accounting Policies for the discussion of the Company’s ability to continue as a going concern. There have been no other changes in the Company’s significant accounting policies in the six months ended June 30, 2017, as compared to the significant accounting policies described in its Annual Report on Form 10-K for the year ended December 31, 2016. Recent Accounting Standards Update Not Yet Effective In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-09, Compensation — Stock Compensation (718)—Scope of Modification Accounting (ASU 2017-09”). This guidance redefines which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting for a share-based payment. ASU 2017-09 is effective for interim and annual periods after December 15, 2017 and early adoption is permitted in any interim period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements and related disclosure. In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715)-Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). This guidance revises the presentation of employer-sponsored defined benefit pension and other postretirement plans for the net periodic benefit cost in the statement of operations and requires that the service cost component of net periodic benefit be presented in the same income statement line items as other employee compensation costs for services rendered during the period. The other components of the net benefit costs are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of income from operations. This guidance allows only the service cost component of net periodic benefit costs to be eligible for capitalization. ASU 2017-07 is effective for interim and annual periods after December 15, 2018 and early adoption is permitted as of the beginning of an annual reporting period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This standard amends the goodwill impairment test to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, up to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective prospectively for interim and annual periods beginning after December 15, 2019. Early adoption is permitted for interim and annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has not determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”). This standard provides a framework in determining when a set of assets and activities is a business. ASU 2017-01 is effective for interim and annual periods beginning after December 15, 2017 on a prospective basis. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements and related disclosures. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASC 2016-18”). This standard provides guidance on the classification and presentation of restricted cash in the statement of cash flows and must be applied retrospectively. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). This standard provides guidance on the tax accounting for the transferring and receiving entities upon transfer of an asset. ASU 2016-16 is effective for the Company’s interim and annual periods beginning after December 15, 2017 and should be applied on a modified retrospective basis. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). This standard provides guidance on the classification of certain cash receipts and payments in the statement of cash flows . It is effective, retrospectively, for the Company’s annual and interim reporting periods beginning after December 15, 2017 or prospectively from the earliest date practicable if retrospective application is impracticable. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 amends existing guidance on the impairment of financial assets and adds an impairment model that is based on expected losses rather than incurred losses and requires an entity to recognize as an allowance its estimate of expected credit losses for its financial assets. An entity will apply this guidance through a cumulative-effect adjustment to retained earnings upon adoption (a modified-retrospective approach) while a prospective transition approach is required for debt securities for which an other-than-temporary impairment had been recognized before the effective date. It is effective for the Company’s annual and interim reporting periods beginning after December 15, 2019. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 introduces a lessee model that requires recognition of assets and liabilities arising from qualified leases on the consolidated balance sheets and consolidated statements of operations and to disclose qualitative and quantitative information about lease transactions. It is effective for interim and annual periods beginning after December 15, 2018. Early adoption is permitted. A modified retrospective transition is required with certain optional practical expedients allowed. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 revises an entity’s accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amends certain disclosure requirements associated with the fair value of financial instruments and is effective for the Company’s annual and interim reporting periods beginning after December 15, 2017. Early adoption is permitted. The Company has not determined whether it will elect early adoption and is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard, along with the amendments issued in 2016 and 2015, provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. ASU 2014-09 is required to be adopted, using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU 2014-09; or (ii) retrospective with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application and providing certain additional disclosures. This standard, as amended, is effective for annual and interim periods beginning after December 15, 2017 and permits entities to early adopt for annual and interim reporting periods beginning after December 15, 2016. The Company does not intend to early adopt this guidance and intends to adopt the new standard in the first quarter of 2018. The Company is still evaluating which method that it will adopt under this guidance. While the Company continues to assess the potential impact of the provisions in the new standard on its accounting policies, processes and system requirements, the Company cannot reasonably estimate quantitative information related to the impact of the new standard on its consolidated financial statements at this time.

Net income (loss) per share

Net income (loss) per share	6 Months Ended
	Jun. 30, 2017
Net income (loss) per share
Net income (loss) per share	Note 2. Net income (loss) per share The following table sets forth the computation of the basic and diluted net income (loss) per share for the periods indicated (in thousands, except per share amounts): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Numerator: Net income (loss) $ (9,341) $ 2,676 $ (20,863) $ 4,986 Denominator: Weighted average shares used to compute per share amount: Basic 43,219 41,603 42,919 41,362 Dilutive effect of equity awards - 2,717 - 2,680 Diluted 43,219 44,320 42,919 44,042 Basic net income (loss) per share $ (0.22) $ 0.06 $ (0.49) $ 0.12 Diluted net income (loss) per share $ (0.22) $ 0.06 $ (0.49) $ 0.11 The Company has excluded the impact of the following employee stock options, restricted stock units and shares expected to be issued under its employee stock purchase plan from the computation of diluted net income (loss) per share, as their effect would have been antidilutive (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Employee stock options 3,898 474 3,898 492 Restricted stock units 1,663 34 1,663 34 Employee stock purchase plan 186 — 186 — 5,747 508 5,747 526

Cash, cash equivalents, short-t

Cash, cash equivalents, short-term investments, and restricted cash	6 Months Ended
	Jun. 30, 2017
Cash, cash equivalents, short-term investments, and restricted cash
Cash, cash equivalents, short-term investments and restricted cash	Note 3. Cash, cash equivalents, short-term investments, and restricted cash The following table summarizes the Company’s cash, cash equivalents, short-term investments and restricted cash (in thousands): June 30, December 31, 2017 2016 Cash and cash equivalents: Cash $ 53,851 $ 58,691 Cash equivalents 19,810 23,809 Cash and cash equivalents $ 73,661 $ 82,500 Short-term investments $ 2,055 $ 19,015 Restricted cash $ 3,290 $ 4,085 As of June 30, 2017 and December 31, 2016, restricted cash included approximately $2.0 million pursuant to an asset purchase agreement with Optoelectronics Components C o., Ltd. (“APAT OE”) relating to the asset sale closed in January 2017, in addition to the compensating balances relating to the Company’s notes payable issued under its line of credit facilities in China (see Note 8). The following table summarizes the Company’s unrealized gains and losses related to its cash equivalents and short-term investments in marketable securities designated as available-for-sale (in thousands): As of June 30, 2017 As of December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Marketable securities: Money market accounts $ 19,810 $ — $ — $ 19,810 $ 23,809 $ — $ — $ 23,809 Money market funds 1,307 — — 1,307 199 — — 199 Corporate debt securities — — — — 9,438 4 (3) 9,439 Government agency securities — — — — 3,767 — (10) 3,757 U.S. government securities 750 — (2) 748 5,008 — (10) 4,998 Sovereign government bonds — — — — 622 — — 622 Total $ 21,867 $ — $ (2) $ 21,865 $ 42,843 $ 4 $ (23) $ 42,824 Reported as: Cash equivalents $ 19,810 $ — $ — $ 19,810 $ 23,809 $ — $ — $ 23,809 Short-term investments 2,057 — (2) 2,055 19,034 4 (23) 19,015 Total $ 21,867 $ — $ (2) $ 21,865 $ 42,843 $ 4 $ (23) $ 42,824 AS of June 30, 2017 and December 31, 2016, maturities of marketable securities were as follows (in thousands): June 30, December 31, 2017 2016 Less than 1 year $ 21,865 $ 36,054 Due in 1 to 2 years — 6,468 Due in 3 to 5 years — 302 Total $ 21,865 $ 42,824 Realized gains and losses on the sale of marketable securities during the three and six months ended June 30, 2017 and 2016 were insignificant. The Company did not recognize any impairment losses on its marketable securities during the three and six months ended June 30, 2017 or 2016. As of June 30, 2017 , the Company did not have any investments in marketable securities that were in an unrealized loss position for a period in excess of 12 months.

Fair value disclosures

Fair value disclosures	6 Months Ended
	Jun. 30, 2017
Fair value disclosures
Fair value disclosures	Note 4. Fair value disclosures Assets and Liabilities Measured at Fair Value on a Recurring Basis The following table presents the Company's assets that are measured at fair value on a recurring basis (in thousands): As of June 30, 2017 As of December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash equivalents and short-term investments: Money market funds $ 1,307 $ — $ — $ 1,307 $ 199 $ — $ — $ 199 U.S. government securities 748 — — 748 4,998 — — 4,998 Money market accounts — 19,810 — 19,810 — 23,809 — 23,809 Corporate debt securities — — — — — 9,439 — 9,439 Government agency securities — — — — — 3,757 — 3,757 Sovereign government bonds — — — — — 622 — 622 Total $ 2,055 $ 19,810 $ — $ 21,865 $ 5,197 $ 37,627 $ — $ 42,824 Foreign currency forward contracts $ — $ * $ — $ * $ — $ * $ — $ * Mutual funds held in Rabbi Trust, recorded in other long-term assets $ 911 $ — $ — $ 911 $ 622 $ — $ — $ 622 *The fair value of the Company’s foreign currency forward contract was immaterial as of June 30, 2017 and December 31, 2016. The Company offers a Non-Qualified Deferred Compensation Plan (“NQDC Plan”) to a select group of its highly compensated employees. The NQDC Plan provides participants the opportunity to defer payment of certain compensation as defined in the NQDC Plan. A Rabbi Trust has been established to fund the NQDC Plan obligation, which was fully funded at June 30, 2017. The assets held by the Rabbi Trust are substantially in the form of exchange traded mutual funds and are included in the Company’s other long-term assets on its condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016. Effective July 1, 2016, the Company maintains a hedging program using forward exchange contracts as economic hedges, to protect against volatility of foreign exchange rate exposure when it is deemed economical to do so, based on a cost-benefit analysis that considers the magnitude of the exposure, the volatility of the exchange rate and the cost of the hedging instrument. The forward contracts are not designated for hedge accounting. Under the hedging program, the Company enters into monthly forward exchange contracts, that have average maturities of one month, to offset the effects of exchange rate exposures for its net intercompany activities denominated in Chinese Renminbi, or RMB, by buying and selling the underlying foreign currency in the future at fixed exchange rates, to offset the consequences of changes in foreign exchange on the balance sheet. Accordingly, fair value changes in the forward contracts help mitigate the changes in the value of the re-measurement of the hedged assets and liabilities attributable to changes in foreign currency exchange rates, except to the extent of the spot-forward differences. The net effect of fair value changes is reported in other income (expense), net. As of June 30, 2017, the fair value of the Company’s foreign currency forward contract was immaterial due to the short-term nature of the contract, which generally expires at each month-end. The total notional value of the Company’s foreign currency exchange contract as of June 30, 2017 was $18.4 million for Chinese Yuan offshore or CNH that approximates the RMB. The following table presents the Company's liabilities that are measured at fair value on a recurring basis (in thousands): As of June 30, 2017 As of December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Rusnano payment derivative $ — $ — $ 389 $ 389 $ — $ — $ 389 $ 389 Foreign currency forward contracts — 24 — 24 — 41 — 41 $ — $ 24 $ 389 $ 413 $ — $ 41 $ 389 $ 430 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets or liabilities are measured at fair value on a nonrecurring basis. These assets consist primarily of non-financial assets such as goodwill and intangible assets accounted for under the cost method. In the three months ended March 31, 2017, the Company recorded a $6.7 million contingent liability within accrued and other current liabilities on its balance sheet in connection with the contingent indemnification commitments pursuant to an asset sale closed in January 2017. See Note 5. These assets and liabilities were measured at fair value based on events or circumstances the Company identified as having significant impact on their fair value during the period. To arrive at the valuation of these assets, the Company considered the discounted cash flows to determine fair value using best estimates and unobservable inputs (Level 3). Assets and Liabilities Not Measured at Fair Value The carrying values of accounts receivable, accounts payable, notes payable and short-term borrowings approximate their fair values due to the short-term nature and liquidity of these financial instruments. The Company’s long-term debt with a commercial bank is valued at market rates, which it considers to be a level 2 fair value measurement. Therefore, the carrying values of the long-term debt, which approximate fair value are included in the Company’s condensed consolidated balance sheets.

Asset sale

Asset sale	6 Months Ended
	Jun. 30, 2017
Asset sale
Asset sale	Note 5. Asset sale In January 2017, the Company completed the sale of its Low Speed Transceiver Products’ assets to APAT OE pursuant to an asset purchase agreement dated December 14, 2016 for consideration of approximately $25.0 million (in RMB equivalent) plus approximately $1.4 million (in RMB equivalent) post-closing transaction service fees to be received under a transition services agreement with APAT OE in which the Company will provide short-term manufacturing and other specific services pursuant to such agreement. The related supply chain purchase commitments and value-added tax obligations have been assumed by APAT OE. The receivable and payable balances related to the transaction service arrangement are recorded within prepaid expenses and other current assets or accrued and other current liabilities on the Company’s consolidated financial statements. As of December 31, 2016, assets held for sale was $13.9 million, consisting of $13.1 million in inventories and $0.8 million in property, plant and equipment. As a result of post-closing adjustments, total consideration was reduced by approximately $3.4 million for inventory. In addition, an immaterial amount of property, plant and equipment was reclassified from assets held for sale. Upon closing, assets sold to APAT OE were approximately $12.8 million, including approximately $12.1 million in inventories and $0.7 million in property, plant and equipment. The adjusted consideration received of approximately $21.6 million is subject to further reduction of up to $10.0 million for any indemnification claims. As of June 30, 2017, the Company has a reserve of $6.7 m illion within accrued and other current liabilities for potential claims and an estimated $0.2 million in additional property, plant and equipment purchases. The reserve for warranties expired on June 30, 2017 and resulted in no change to the gain on the sale that was recorded in the first quarter of 2017. The Company recognized a $2.0 million gain on the sale of these assets within operating income in the six months ended June 30, 2017. All of the Low Speed Transceiver Products were part of the Company’s Network Products and Solution product group and included the low speed optical network (PON) products for which the end-of-life plan was announced in mid-2016.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2017
Balance sheet components
Balance sheet components	Note 6. Balance sheet components Accounts receivable, net Accounts receivable, net consists of the following (in thousands): June 30, 2017 December 31, 2016 Accounts receivable $ 56,151 $ 78,143 Trade notes receivable 514 2,892 Allowance for doubtful accounts (140) (425) $ 56,525 $ 80,610 Inventories, net Inventories, net consist of the following (in thousands): June 30, 2017 December 31, 2016 Raw materials $ 36,609 $ 23,348 Work in process 14,552 10,996 Finished goods (1) 30,167 13,893 $ 81,328 $ 48,237 (1) Finished goods inventory at customer vendor managed inventory locations was $6.6 million and $8.3 million as of June 30, 2017 and December 31, 2016, respectively. Prepaid expenses and other current assets Prepaid expenses and other current assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Prepaid taxes and taxes receivable $ 13,015 $ 16,102 Deposits and other prepaid expenses 4,279 3,571 Transition service agreement related (Note 5) 14,409 — Other receivable 5,063 2,723 $ 36,766 $ 22,396 Purchased intangible assets Purchased intangible assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Gross Accumulated Net Gross Accumulated Net Assets Amortization Assets Assets Amortization Assets Technology and patents $ 37,200 $ (34,048) $ 3,152 $ 36,918 $ (33,316) $ 3,602 Customer relationships 15,207 (14,380) 827 15,039 (13,990) 1,049 Leasehold interest 1,256 (337) 919 1,226 (315) 911 $ 53,663 $ (48,765) $ 4,898 $ 53,183 $ (47,621) $ 5,562 Amortization expense relating to technology and patents and the leasehold interest intangible assets is included within cost of goods sold and customer relationships within operating expenses. The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Cost of goods sold $ 203 $ 848 $ 465 $ 1,689 Operating expenses 118 460 236 913 Total $ 321 $ 1,308 $ 701 $ 2,602 The estimated future amortization expense of purchased intangible assets as of June 30, 2017, is as follows (in thousands): 2017 (remaining six months) $ 640 2018 1,209 2019 806 2020 688 2021 688 Thereafter 867 $ 4,898 Accrued and other current liabilities Accrued and other current liabilities consist of the following (in thousands): June 30, 2017 December 31, 2016 Employee-related $ 13,371 $ 18,654 Income and other taxes payable 857 3,956 Deferred revenue, current 925 956 Accrued warranty 528 678 Rusnano payment derivative — 389 Asset sale related contingent liabilities (Note 5) 6,851 — Transition service agreement related payables (Note 5) 12,671 — Other accrued expenses 5,522 5,992 $ 40,725 $ 30,625 Warranty Accrual The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Beginning balance $ 582 $ 1,143 $ 678 $ 1,175 Warranty accruals 34 (203) (28) (101) Settlements (88) (271) (122) (405) Ending balance $ 528 $ 669 $ 528 $ 669 Other noncurrent liabilities Other noncurrent liabilities consist of the following (in thousands): June 30, 2017 December 31, 2016 Pension and other employee-related $ 5,527 $ 5,045 Deferred rent 2,433 1,509 Deferred revenue 1,243 136 Government grant 952 1,048 Deferred income tax liabilities 58 46 Rusnano payment derivative 389 — Asset retirement obligations and other 3,365 1,155 $ 13,967 $ 8,939

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2017
Restructuring
Restructuring	Note 7. Restructuring In January 2017, the Company initiated certain restructuring actions in connection with the sale of its Low Speed Transceiver Products’ assets and the current lower market outlook for China. The actions consisted of workforce reductions in China. The related restructuring liability included in accrued and other current liabilities was paid in May 2017. The Company took further action in May 2017 to reduce operating costs. The Company recorded $0.7 million and $1.0 million in r estructuring ch arges within cost of goods sold and operating expenses in the three and six months ended June 30, 2017. As of June 30, 2017, the Company’s restructuring liability of $0.2 million was included in accrued and other current liabilities on its condensed consolidated balance sheets. There were no restructuring charges in the three and six months ended June 30, 2016 or restructuring liabilities as of December 31, 2016.

Debt

Debt	6 Months Ended
	Jun. 30, 2017
Debt
Debt	Note 8. Debt The table below summarizes the carrying amount and weighted average interest rate of the Company’s debt (in thousands, except percentages): June 30, 2017 December 31, 2016 Carrying Interest Carrying Interest Amount Rate Amount Rate Notes payable $ 4,149 — $ 6,390 — Short-term borrowing-Comerica Bank 20,000 3.80 % 23,800 3.37 % Total notes payable and short-term borrowing $ 24,149 $ 30,190 Long-term debt, current and non-current: Mitsubishi Bank loans $ 16,723 1.43 % $ 11,253 1.43 % Unaccreted discount and issuance costs within current portion of long-term debt (120) (108) Unaccreted discount and issuance costs within long-term debt, net of current portion (335) (183) Total long-term debt, net of unaccreted discount and issuance costs $ 16,268 $ 10,962 Reported as: Current portion of long-term debt $ 5,458 $ 747 Long-term debt, net of current portion 10,810 10,215 Total long-term debt, net of unaccreted discount and issuance costs $ 16,268 $ 10,962 Notes payable The Company regularly issues notes payable to its suppliers in China. These notes are supported by non-interest bearing bank acceptance drafts issued under the Company’s existing line of credit facilities and are due three to six months after issuance. As a condition of the notes payable arrangements, the Company is required to keep a compensating balance at the issuing banks that is a percentage of the total notes payable balance until the amounts are settled. As of June 30, 2017, the Company’s subsidiary in China had three short-term line of credit facilities with banking institutions: · Under the first line of credit facility, the Company can borrow up to RMB 120.0 million ($17.7 million) for short-term loans at varying interest rates, or up to approximately RMB 171.4 million ($25.3 million) for bank acceptance drafts (with a 30% compensating balance requirement). This line of credit facility expires in July 2019. · Under the second line of credit facility, which expires in September 2017, the Company can borrow up to RMB 266.0 million (approximately $39.2 million) for short-term loans at varying interest rates or up to approximately RMB 380.0 million (approximately $56.1 million) for bank acceptance drafts (with a 30% compensating balance requirement) . · Under the third line of credit facility, which expires in July 2019, the Company can borrow up to RMB 30.0 million ($4.4 million) for short-term loans at varying interest rates, or up to approximately RMB 42.9 million ($6.3 million) for bank acceptance drafts (with a 30% compensating balance requirement). Under these line of credit facilities, the non-interest bearing bank acceptance drafts issued in connection with the Company’s notes payable to its suppliers in China, had an outstanding balance of $4.1 million and $6.4 million as of June 30, 2017 and December 31, 2016, respectively. In addition to the outstanding notes payable, three letters of credit totaling $1.6 million were issued to its suppliers in 2016 for equipment purchases delivered by December 2016. These letters of credit require a 30% compensating balance. As of December 31, 2016, the outstanding balance of these letters of credit was immaterial and was fully repaid as of June 30, 2017. As of June 30, 2017 and December 31, 2016, compensating balances relating to these bank acceptance drafts and letters of credit issued to suppliers and the Company’s subsidiaries totaled $1.2 million and $2.1 million, respectively. Compensating balances are classified as restricted cash on the Company’s condensed consolidated balance sheets. Short-Term Borrowing The Company has a credit agreement, as amended, with Comerica Bank as lead bank in the U.S. (the “Comerica Bank Credit Facility”) with a borrowing capacity of up to $30.0 million. In January 2017, the Company amended the Comerica Bank Credit Facility to extend the maturity to April 30, 2017 and to remove the covenant related to EBITDA. In April 2017, the Company amended the Comerica Bank Credit Facility to extend the maturity date to July 31, 2017 and to add a financial covenant that required maintenance of a modified EBITDA. In June 2017, the Company amended the Comerica Bank Credit Facility to extend the maturity to August 31, 2017, to allow NeoPhotonics China to borrow up to $17.0 million, to limit the indebtedness under the facility to $20.0 million and to modify the EBITDA requirement. As of June 30, 2017 and December 31, 2016, the Company was in compliance with the covenants of the credit facility except for exceeding the capital expenditure limit as of December 31, 2016 for which a waiver was obtained subsequent to the year end. Borrowings under the Comerica Bank Credit Facility bear interest at an interest rate option of a base rate as defined in the agreement plus 1.75% or LIBOR plus 2.75%. Base rate is based on the greater of (a) the effective prime rate, (b) the Federal Funds effective rate plus one percent, and (c) the daily adjusting LIBOR rate plus one percent. As of June 30, 2017 and December 31, 2016, the rate on the LIBOR option was 3.80% and 3.37%, respectively, and the outstanding balance was $20.0 million and $23.8 million, respectively. Long-Term Debt On February 25, 2015, the Company entered into certain loan agreements and related agreements with the Bank of Tokyo-Mitsubishi UFJ, Ltd. (the “Mitsubishi Bank”) that provided for (i) a term loan in the aggregate principal amount of 500 million JPY ($4.2 million) (the “Term Loan A”) and (ii) a term loan in the aggregate principal amount of one billion JPY ($8.4 million) (the “Term Loan B” and together with the Term Loan A, the “Mitsubishi Bank Loans”). The Mitsubishi Bank Loans are secured by a mortgage on certain real property and buildings owned by the Company’s Japanese subsidiary. Interest on the Mitsubishi Bank Loans accrues and is paid monthly based upon the annual rate of the monthly Tokyo Interbank Offer Rate (TIBOR) plus 1.40%. The Term Loan A requires interest only payments until the maturity date of February 23, 2018, with a lump sum payment of the aggregate principal amount on the maturity date. The Term Loan B requires equal monthly payments of principal equal to 8,333,000 JPY until the maturity date of February 25, 2025, with a lump sum payment of the balance of 8,373,000 JPY on the maturity date. Interest on the Term Loan B is accrued based upon monthly TIBOR plus 1.40% and is secured by real estate collateral. In conjunction with the execution of the Bank Loans, the Company paid a loan structuring fee, including consumption tax, of 40,500,000 JPY ($0.3 million) . The Mitsubishi Bank Loans contain customary representations and warranties and customary affirmative and negative covenants applicable to the Company’s Japanese subsidiary, including, among other things, restrictions on cessation in business, management, mergers or acquisitions. The Mitsubishi Bank Loans contain financial covenants relating to minimum net assets, maximum ordinary loss and a dividends covenant. Outstanding principal balance under the Mitsubishi Bank Loans and unamortized debt issuance costs were approximately 1.2 billion JPY (approximately $11.1 million) and 50.0 million JPY (approximately $0.5 million), respectively, as of June 30, 2017. The Company was in compliance with the related covenants as of June 30, 2017 and December 31, 2016. In March 2017, the Company entered into a loan agreement and related agreements with the Mitsubishi Bank for a term loan of 690 million JPY (approximately $6.2 million) (the “2017 Mitsubishi Bank Loan”) to acquire manufacturing equipment for its Japanese subsidiary. This loan is secured by the manufacturing equipment acquired from the loan proceeds. Interest on the 2017 Mitsubishi Bank Loan is based on the annual rate of the monthly TIBOR rate plus 1.00%. The 2017 Mitsubishi Bank Loan matures on March 29, 2024 and requires monthly interest and principal payments over 72 months commencing in April 2018. The loan contains customary covenants relating to minimum net assets, maximum ordinary loss and a dividends covenant. The loan is available from March 31, 2017 to March 30, 2018 and 625.3 million JPY (approximately $5.6 million) under this loan was drawn as of June 30, 2017. At June 30, 2017, maturities of total long-term debt were as follows (in thousands): 2017 (remaining six months) $ 446 2018 6,030 2019 1,796 2020 1,796 2021 1,796 Thereafter 4,859 $ 16,723

Japan pension plans

Japan pension plans	6 Months Ended
	Jun. 30, 2017
Japan pension plans
Japan pension plans	Note 9. Japan pension plan The pension liability related to the Company’s Retirement Allowance Plan (“RAP”) in Japan at June 30, 2017 and December 31, 2016 was $4.8 million and $4.8 million, respectively, of which $0.2 million and $0.4 million, respectively, was recorded in accrued and other current liabilities and the remainder in other noncurrent liabilities on the Company’s condensed consolidated balance sheet. Net periodic pension cost associated with this plan was immaterial in the three and six months ended June 30, 2017 and 2016.

Commitments and contingencies

Commitments and contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and contingencies disclosure
Commitments and contingencies	Note 10. Commitments and contingencies Litigation From time to time, the Company is subject to various claims and legal proceedings, either asserted or unasserted, that arise in the ordinary course of business. The Company accrues for legal contingencies if the Company can estimate the potential liability and if the Company believes it is probable that the case will be ruled against it. If a legal claim for which the Company did not accrue is resolved against it, the Company would record the expense in the period in which the ruling was made. The Company believes that the likelihood of an ultimate amount of liability, if any, for any pending claims of any type (alone or combined) that will materially affect the Company’s financial position, results of operations or cash flows is remote. The ultimate outcome of any litigation is uncertain, however, and unfavorable outcomes could have a material negative impact on the Company’s financial condition and operating results. Regardless of outcome, litigation can have an adverse impact on the Company because of defense costs, negative publicity, diversion of management resources and other factors. On January 5, 2010, Finisar Corporation, or Finisar, filed a complaint in the U.S. District Court for the Northern District of California, or the Court, against Source Photonics, Inc., MRV Communications, Inc., Oplink Communications, Inc. and the Company, or collectively, the co-defendants. In the complaint Finisar alleged infringement of certain of its U.S. patents. In 2010 the Company filed an answer to the complaint and counterclaims, asserting two claims of patent infringement and additional claims. The Court dismissed without prejudice all co-defendants (including the Company) except Source Photonics, Inc., on grounds that such claims should have been asserted in four separate lawsuits, one against each defendant. This dismissal does not prevent Finisar from bringing a new similar lawsuit against the Company. In 2011 the Company and Finisar agreed to suspend their respective claims and in 2012 the Company and Finisar further agreed to toll their respective claims. While there has been no action on this matter since 2012, the Company is currently unable to predict the outcome of this dispute and therefore cannot determine the likelihood of loss nor estimate a range of possible loss. On January 2, 2013, the Company was served with a lawsuit, filed in Belgium by a distributor called Laser 2000 Beneluo SA (“Laser 2000”) claiming unpaid commissions. The distributor agreement was formally terminated as of January 3, 2012. The Company paid $492,000 to Laser 2000 as partial settlement of claims and to avoid penalties from the Belgian Court and submitted a legal brief to court on September 16, 2013. Laser 2000 filed a response on December 16, 2013 and the Company filed the final rebuttal brief on January 30, 2014. On March 23, 2015, the Belgian Court issued a ruling awarding Laser 2000 approximately one million euros in damages (approximately $1,100,000 at then-current exchange rates). The Company did not believe it would ultimately be liable for the full amount of damage and accrued $0.3 million in March 2015 for estimated probable net litigation expense relating to this matter. The Company appealed this verdict and, in April 2017, settled this case and paid approximately $250,000. On December 27, 2016 the Company was served with a lawsuit filed by Lestina International Ltd. (“Lestina”), in Santa Clara County, CA. The lawsuit is regarding a dispute of approximately $3 million related to purchase orders for the Company’s Low Speed Transceiver Products that was soon thereafter sold by the Company to APAT OE in January 2017. The purchase orders in question were included in the asset sale and were assumed liabilities by the purchaser of the business. Discovery is in process. The Company is unable to predict with certainty the outcome of this matter, but is seeking to resolve the matter by the end of 2017 either through a court dismissal of the action or a resolution with the plaintiff and/or the purchaser of the Low Speed Transceiver Products’ assets. Because the purchase orders in question were an assumed liability of the Low Speed Transceiver Products’ assets that were transferred to the purchaser, the Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its consolidated financial position, results of operations or cash flows. APAT Arbitration On June 16, 2017, APAT Optoelectronics Components Co., Ltd. filed an arbitration claim against NeoPhotonics (China) Co., Ltd. (the Company’s China subsidiary), claiming that $1.5 million of the inventory that was sold to APAT OE by NeoChina in an Asset Purchase Agreement executed between the parties on December 14, 2016 was aged inventory and of no value. The arbitration was heard in the Shenzhen Court of International Arbitration on August 2, 2017. In connection with this action, APAT placed a lien on certain of the Company’s bank accounts in China in July 2017. The Company anticipates it will be between three and six months to receive a ruling. The Company is unable to predict the outcome of this matter. Indemnifications In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations. As of June 30, 2017, the Company did not have any material indemnification claims that were probable or reasonably possible. Leases The Company leases various facilities under non-cancelable operating leases expiring through 2027. As of June 30, 2017, future minimum payments under these operating leases totaled approximately $32.8 million and future minimum sublease receipts were approximately $1.0 million. Rent expense was $1.3 million and $2.3 million in the three and six months ended June 30, 2017 and $0.5 million and $1.1 million in the three and six months ended June 30, 2016. On June 13, 2017, the Company entered into an office lease for approximately 39,000 square feet for the Company’s current headquarters in San Jose (the “Lease”) with a commencement date of June 1, 2017. The Company’s existing office lease for the facility was terminated and replaced by the new Lease. Upon commencement, the Lease has an initial term of one hundred and twenty-three (123) months, ending September 30, 2027, (the “Initial Term”) with a monthly rental rate of $41,388, escalating annually to a maximum monthly rental rate of approximately $72,525 in the last year of the Initial Term. Upon termination of the Lease, the Company anticipates a restoration cost of approximately $0.7 million. In September 2016, the Company entered into an office lease for approximately 64,000 square feet of office and laboratory space located adjacent to the Company’s current headquarters in San Jose (the “Lease”). The term of the Lease commenced on January 1, 2017. Upon commencement, the Lease has an initial term of one hundred and twenty-nine (129) months, ending on September 30, 2027 (the “Initial Term”), with a monthly rental rate of $144,000, escalating annually to a maximum monthly rental rate of approximately $194,000 in the last year of the Initial Term. The Landlord has agreed to provide the office and laboratory space to the Company free of charge for the first nine months of the Initial Term through September 30, 2017. Upon termination of the Lease, the Company anticipates a restoration cost of approximately $3.1 million. Penalty Payment Derivative In connection with a private placement transaction with Joint Stock Company “Rusnano” (formerly Open Joint Stock Company “RUSNANO”), or Rusnano, in 2012, the Company agreed to certain performance obligations including establishing a wholly-owned subsidiary in Russia and making a $30.0 million investment commitment (the “Investment Commitment’) towards the Company’s Russian operations, which could be partially satisfied by cash and/or non-cash investment inside or outside of Russia and/or by way of non-cash asset transfers. The Rights Agreement as amended in 2015 (the “Amended Rights Agreement”) limits the maximum amount of penalties and/or exit fee (the “Rusnano Payment”) to be paid by the Company to $5.0 million in the aggregate and allows such payment to be reduced when certain milestones are met over time. The Amended Rights Agreement also provides for an updated investment plan for the Company’s Russian subsidiaries that includes non-cash transfer of licensing rights to intellectual property, non-cash transfers of existing equipment and commitments to complete the remaining investment milestones through 2019. The Company fulfilled its investment commitment required by 2016 and had contributed over $18.8 million in cash and assets to its subsidiaries in Russia as of December 31, 2016. Therefore, the Company would not be held liable for the Rusnano Payment as of each of December 31, 2016 and June 30, 2017. In the event certain of the Investment Commitments are not achieved by 2019, the Company has the ability to cease the operations of its Russian subsidiaries by paying exit fees of $2.0 million at that time. In August 2016, the Company entered into a letter of agreement with Rusnano to agree to transfer a 10G SFP+ transceiver product line and incur expected costs of approximately $0.1 million, by July 30, 2017, which will not be counted toward the Company’s overall Investment Commitment. Since the asset sale of the Company’s Low Speed Transceiver Products was completed in January 2017, the Company intends to undertake such expense by spending such amount in another manner to be discussed and agreed between the parties. Rusnano has non-transferable veto rights over the Company’s Russian subsidiaries’ annual budget during the investment period and must approve non-cash asset transfers to be made in satisfaction of the Investment Commitment. The Company accounted for the Rusnano Payment as an embedded derivative instrument. The fair value of the Penalty Payment derivative has been estimated at the date of the original common stock sale (April 27, 2012) and at each subsequent balance sheet date using a probability-weighted discounted future cash flow approach using unobservable inputs, which are classified as Level 3 within the fair value hierarchy. The primary inputs for this approach include the probability of achieving the Investment Commitment and a discount rate that approximates the Company’s incremental borrowing rate. After the initial measurement, changes in the fair value of this derivative are recorded in other income (expense), net. The estimated fair value of this derivative was $0.4 million as of each of June 30, 2017 and December 31, 2016. As of June 30, 2017, the derivative was reported within other noncurrent liabilities and as of December 31, 2016 the derivative was reported within accrued and other current liabilities on the Company’s condensed consolidated balance sheets (see Note 4).

Stockholders' equity

Stockholders' equity	6 Months Ended
	Jun. 30, 2017
Stockholders’ equity disclosure
Stockholders’ Equity	Note 11. Stockholders’ equity Common Stock As of June 30, 2017, the Company had reserved 7,807,121 common stock shares for issuance under its stock option plans and 426,217 common stock shares for issuance under its employee stock purchase plan. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss, net of related taxes, were as follows (in thousands): Foreign Currency Translation Adjustments Unrealized Gain (Loss) on Available-For-Sale Securities Defined Benefit Pension Plan Adjustment Total Accumulated Other Comprehensive Loss Balance at December 31, 2016 $ (8,235) $ (19) $ (147) $ (8,401) Other comprehensive income, net of taxes of zero and reclassifications 3,913 16 — 3,929 Balance at June 30, 2017 $ (4,322) $ (3) $ (147) $ (4,472) No material amounts were reclassified out of accumulated other comprehensive income during the three and six months ended June 30, 2017 and 2016 for realized gains or losses on available-for-sale securities. Accumulated Deficit Approximately $8.7 million of the Company’s retained earnings within its total accumulated deficit at June 30, 2017 and December 31, 2016 was subject to restriction due to the fact that the Company’s subsidiaries in China are required to set aside at least 10% of their respective accumulated profits each year end to fund statutory common reserves as well as allocate a discretional portion of their after-tax profits to their staff welfare and bonus fund.

Stock-based compensation

Stock-based compensation	6 Months Ended
	Jun. 30, 2017
Stock-based compensation
Stock-based compensation	Note 12. Stock-based compensation The following table summarizes the stock-based compensation expense recognized in the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Cost of goods sold $ 324 $ 719 $ 471 $ 1,308 Research and development 511 556 1,173 1,527 Sales and marketing 313 365 777 1,252 General and administrative 738 590 1,337 1,582 $ 1,886 $ 2,230 $ 3,758 $ 5,669 The vesting of stock options covering approximately 1.1 million shares of the Company’s common stock and stock appreciation units (“SAUs”) of approximately 0.2 million shares with a market-based vesting condition were accelerated in September 2016 as the market-based condition of these stock options and SAUs was satisfied when the average closing price of the Company’s common stock over a period of 20 consecutive trading days was equal to or exceeded $15.00 per share and the recipients remained in the continuous service with the Company. Outstanding SAUs are re-measured each reporting period at fair value until settlement. Determining Fair Value The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions: Three Months Ended Six Months Ended June 30, June 30, Stock options 2017 2016 2017 2016 Weighted-average expected term (years) 5.99 5.25 5.99 5.20 Weighted-average volatility 65% 63% 65% 63% Risk-free interest rate 2.08% 1.21%-1.38% 2.08% 1.21%-1.76% Expected dividends — % — % — % — % Stock appreciation units Weighted-average expected term (years) 2.33 2.84 2.39 2.94 Weighted-average volatility 71% 62% 71% 62% Risk-free interest rate 0.76%-1.50% 0.59%-0.95% 0.51%-1.50% 0.59%-1.47% Expected dividends — % — % — % — % ESPP Weighted-average expected term (years) 0.68 0.70 0.68 0.70 Weighted-average volatility 55% 70% 55% 70% Risk-free interest rate 0.45%-0.91% 0.08%-0.39% 0.45%-0.91% 0.08%-0.39% Expected dividends — % — % — % — % Stock Options and Restricted Stock Units (RSUs) The following table summarizes the Company’s stock option and RSU activity during the six months ended June 30, 2017 : Stock Options Restricted Stock Units Weighted Weighted Average Average Number of Exercise Number of Grant Date Shares Price Units Fair Value Balance at December 31, 2016 4,301,340 $ 5.18 2,089,473 $ 10.15 Granted 45,126 9.20 183,177 9.48 Exercised/Converted (402,977) 3.76 (516,478) 7.89 Cancelled/Forfeited (44,977) 9.15 (89,926) 10.65 Balance at June 30, 2017 3,898,512 $ 5.33 1,666,246 $ 10.75 Stock appreciation units SAUs are liability classified share-based awards. The Company did not grant any SAUs during the three and six months ended June 30, 2017 or 2016. As of June 30, 2017 and December 31, 2016, there were 264,755 and 286,768 SAUs outstanding, respectively, and related SAU liabilities were $1.2 million and $2.0 million, respectively. Employee Stock Purchase Plan (“ESPP”) As of June 30, 2017, there was $0.2 million of unrecognized stock-based compensation expense for employee stock purchase rights that will be recognized over the remaining offering period through November 2017.

Income taxes

Income taxes	6 Months Ended
	Jun. 30, 2017
Income taxes
Income taxes	Note 13. Income taxes The income tax (provision) benefit for income taxes in the periods presented is based upon the income (loss) before income taxes (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Income tax (provision) benefit $ 451 $ (626) $ 618 $ (1,667) The Company’s income tax (provision) benefit in the three and six months ended June 30, 2017 and 2016 was primarily related to income taxes of the Company’s non-U.S. operations. The Company conducts its business globally and its operating income is subject to varying rates of tax in the U.S., China and Japan. Consequently, the Company’s effective tax rate is dependent upon the geographic distribution of its earnings or losses and the tax laws and regulations in each geographical region. Historically, the Company has experienced net losses in the U.S. and in the short term, expects this trend to continue. One of the Company’s subsidiaries in China historically qualified for a preferential 15% tax rate available for high technology enterprises as opposed to the statutory 25% tax rate. In June 2016, the State Administration of Taxation issued a notice to adjust the requirements for high technology enterprise status. As a result, the Company’s China subsidiary did not meet the requirements for the tax year 2016. Therefore, the Company computed its China subsidiary’s tax provision (benefit) for 2016 and the three and six months ended June 30, 2017 based on the 25% regular corporate income tax rate. Due to historic losses in the U.S., the Company has a full valuation allowance on its U.S. federal and state deferred tax assets. Management continues to evaluate the realizability of deferred tax assets and the related valuation allowance. If management's assessment of the deferred tax assets or the corresponding valuation allowance were to change, the Company would record the related adjustment to income during the period in which management makes the determination. As of June 30, 2017, there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for the year ended December 31, 2016.

Subsequent event

Subsequent event	6 Months Ended
	Jun. 30, 2017
Subsequent Events
Subsequent event	Note 14. Subsequent events In July 2017, NeoPhotonics China borrowed $17.0 million under one of its existing lines of credit with a financial institution in China. The short-term borrowing bears interest at the rate of 4.01% and will mature on January 2, 2018.

Basis of presentation and sig22

Basis of presentation and significant accounting policies (Policies)	6 Months Ended
	Jun. 30, 2017
Basis of presentation and significant accounting policies
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The condensed consolidated financial statements of NeoPhotonics Corporation (“NeoPhotonics” or the “Company”) as of June 30, 2017 and for the three and six months ended June 30, 2017 and 2016, have been prepared in accordance with the instructions on Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In accordance with those rules and regulations, the Company has omitted certain information and notes normally provided in the Company’s annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, consisting only of normal recurring items, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the interim periods. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”). These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016. The results of operations for the three and six months ended June 30, 2017 are not necessarily indicative of the results expected for the entire fiscal year. All intercompany accounts and transactions have been eliminated. Going Concern Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, requires an entity to disclose information about its potential inability to continue as a going concern when conditions and events indicate that it is probable that the entity may be unable to meet its obligations as they become due within one year. Management has assessed the Company’s ability to continue as a going concern within one year of the filing date of this Quarterly Report on Form 10-Q with the SEC in August 2017. The accompanying unaudited condensed financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. As of June 30, 2017, the Company’s working capital was $102.8 million including available cash, cash equivalents, short-term investments and restricted cash of approximately $79.0 million. In the first six months of 2017, the Company had operating losses of $21.6 million and negative cash flows from operations of $16.5 million. It had an accumulated deficit of approximately $319.5 million as of June 30, 2017. The Company has two credit agreements both of which are subject to renewal or expiration in the third quarter of 2017: a $30.0 million credit facility with Comerica Bank in the U.S. and a $39.2 million credit facility with CITIC Bank in China. As of June 30, 2017, the Company had $20.0 million debt outstanding under the Comerica facility and subsequent to the quarter end the Company borrowed $17.0 million from CITIC Bank. These amounts are due on August 31, 2017 and January 2, 2018, respectively. In addition, the Company’s forecasts for revenue from customers in China during the second half of 2017 have been reduced from prior levels as industry forecasts for the region’s telecom carriers deploying metro and provincial networks have been reduced in the near term. The Company must extend or replace one of the above-noted credit agreements in order to have sufficient resources to fund the Company’s currently planned operations and expenditures over the next twelve months. Management believes extending or replacing one of these credit agreements is probable; however, if this is unsuccessful, management intends to implement working capital management plans as described below. The Company implemented a restructuring plan in May 2017 to execute a range of cost saving measures that reduced and delayed spending in the second quarter of 2017. The Company intends to manage production and inventory levels, aggressively pursue collections, further reduce or delay product development projects and capital expenditures to conserve its cash resources. Additionally, the Company has $20.8 million of unused credit as part of a credit facility in China that is available to the Company until July 2019. If cash flows from such plans are insufficient to meet its cash flow needs over the next twelve months, the Company has developed a contingency plan. This contingency plan includes closing certain operations, eliminating some marketing and research and development programs and further reducing its administrative costs. The Company believes that it is probable that these plans can be effectively implemented and that it is probable these plans will mitigate issues that might arise within one year after these financial statements are issued should the Company be unable to extend or replace one of its existing credit agreements. The Company operates in an industry that makes its prospects difficult to evaluate with certainty. Future declines in China market demand or other changes to the Company’s forecasts could adversely affect the Company’s results of operations, financial position and cash flows. The Company may need to raise additional debt or equity capital to fund its operations in the next twelve months. Any additional debt arrangements may likely require regular interest payments which could adversely affect the Company’s operations. There can be no assurance that additional debt or equity capital will be available on acceptable terms, or at all, or that the Company’s revenue will reach a level sufficient to provide for self-sustaining cash flows. Although management believes it is probable that it will be able to satisfactorily complete these plans, if the Company is not successful in completing these plans it could raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying unaudited condensed financial statements do not include any adjustments that may result from the outcome of these uncertainties. Certain Significant Risks and Uncertainties The Company operates in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, any of the following areas could have a negative effect on the Company in terms of its future financial position, results of operations or cash flows: the general state of the U.S., China and world economies; the highly cyclical nature of the industries the Company serves; the loss of any of a small number of its larger customers; ability to obtain additional financing; inability to meet certain debt covenants; fundamental changes in the technology underlying the Company’s products; the hiring, training and retention of key employees; successful and timely completion of product design efforts; and new product design introductions by competitors.
Going Concern	Going Concern Accounting Standards Update (“ASU”) No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, requires an entity to disclose information about its potential inability to continue as a going concern when conditions and events indicate that it is probable that the entity may be unable to meet its obligations as they become due within one year. Management has assessed the Company’s ability to continue as a going concern within one year of the filing date of this Quarterly Report on Form 10-Q with the SEC in August 2017. The accompanying unaudited condensed financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. As of June 30, 2017, the Company’s working capital was $102.8 million including available cash, cash equivalents, short-term investments and restricted cash of approximately $79.0 million. In the first six months of 2017, the Company had operating losses of $21.6 million and negative cash flows from operations of $16.5 million. It had an accumulated deficit of approximately $319.5 million as of June 30, 2017. The Company has two credit agreements both of which are subject to renewal or expiration in the third quarter of 2017: a $30.0 million credit facility with Comerica Bank in the U.S. and a $39.2 million credit facility with CITIC Bank in China. As of June 30, 2017, the Company had $20.0 million debt outstanding under the Comerica facility and subsequent to the quarter end the Company borrowed $17.0 million from CITIC Bank. These amounts are due on August 31, 2017 and January 2, 2018, respectively. In addition, the Company’s forecasts for revenue from customers in China during the second half of 2017 have been reduced from prior levels as industry forecasts for the region’s telecom carriers deploying metro and provincial networks have been reduced in the near term. The Company must extend or replace one of the above-noted credit agreements in order to have sufficient resources to fund the Company’s currently planned operations and expenditures over the next twelve months. Management believes extending or replacing one of these credit agreements is probable; however, if this is unsuccessful, management intends to implement working capital management plans as described below. The Company implemented a restructuring plan in May 2017 to execute a range of cost saving measures that reduced and delayed spending in the second quarter of 2017. The Company intends to manage production and inventory levels, aggressively pursue collections, further reduce or delay product development projects and capital expenditures to conserve its cash resources. Additionally, the Company has $20.8 million of unused credit as part of a credit facility in China that is available to the Company until July 2019. If cash flows from such plans are insufficient to meet its cash flow needs over the next twelve months, the Company has developed a contingency plan. This contingency plan includes closing certain operations, eliminating some marketing and research and development programs and further reducing its administrative costs. The Company believes that it is probable that these plans can be effectively implemented and that it is probable these plans will mitigate issues that might arise within one year after these financial statements are issued should the Company be unable to extend or replace one of its existing credit agreements. The Company operates in an industry that makes its prospects difficult to evaluate with certainty. Future declines in China market demand or other changes to the Company’s forecasts could adversely affect the Company’s results of operations, financial position and cash flows. The Company may need to raise additional debt or equity capital to fund its operations in the next twelve months. Any additional debt arrangements may likely require regular interest payments which could adversely affect the Company’s operations. There can be no assurance that additional debt or equity capital will be available on acceptable terms, or at all, or that the Company’s revenue will reach a level sufficient to provide for self-sustaining cash flows. Although management believes it is probable that it will be able to satisfactorily complete these plans, if the Company is not successful in completing these plans it could raise substantial doubt about the Company’s ability to continue as a going concern. The accompanying unaudited condensed financial statements do not include any adjustments that may result from the outcome of these uncertainties.
Certain Significant Risks And Uncertainties	Certain Significant Risks and Uncertainties The Company operates in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, any of the following areas could have a negative effect on the Company in terms of its future financial position, results of operations or cash flows: the general state of the U.S., China and world economies; the highly cyclical nature of the industries the Company serves; the loss of any of a small number of its larger customers; ability to obtain additional financing; inability to meet certain debt covenants; fundamental changes in the technology underlying the Company’s products; the hiring, training and retention of key employees; successful and timely completion of product design efforts; and new product design introductions by competitors.
Concentration	Concentration In the three months ended June 30, 2017, Huawei Technologies Co. Ltd. and their affiliate HiSilicon Technologies (together with Huawei Technologies Co. Ltd., “Huawei”) and Ciena Corporation (“Ciena”) accounted for approximately 37% and 19% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 89% of the Company’s total revenue. In the three months ended June 30, 2016, Huawei and Ciena accounted for approximately 45% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 91% of the Company’s total revenue. In the six months ended June 30, 2017, Huawei and Ciena each accounted for 39% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 89% of its total revenue. In the six months ended June 30, 2016, Huawei and Ciena each accounted for 49% and 16% of the Company’s total revenue, respectively, and the Company’s top ten customers represented approximately 91% of its total revenue. As of June 30, 2017, two customers accounted for approximately 36% and 12% of the Company’s accounts receivable. As of December 31, 2016, three customers accounted for approximately 42%, 12% and 12%, respectively, of the Company’s accounts receivable.
Use of estimates	Use of Estimates The preparation of financial statements in accordance with U.S. 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 financial statements and the reported revenue and expenses during the reporting period. Significant estimates made by management include: the useful lives of property, plant and equipment and intangible assets as well as future cash flows to be generated by those assets; fair values of identifiable assets acquired and liabilities assumed in business combinations; allowances for doubtful accounts; valuation allowances for deferred tax assets; valuation of excess and obsolete inventories; warranty reserves; litigation accrual and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
Stock-based compensation	Effective January 1, 2017, the Company adopted ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies certain aspects of the accounting for shared-based payment transactions, including income taxes, classification of awards and classification on the statement of cash flows. It eliminates the requirement to delay the recognition of excess tax benefits until current taxes payable are reduced. Under this standard, previously unrecognized excess tax benefits shall be recognized on a modified retrospective basis. Upon adoption, the Company’s previously unrecognized excess tax benefits of $8.6 million had no impact on its accumulated deficit balance as the related U.S. deferred tax assets were fully offset by a valuation allowance. The Company elected to apply the change in presentation on the statements of cash flows prospectively and elected to continue to account for estimated forfeitures over the vest period of the shared-based awards.
Inventories	Effective January 1, 2017, the Company also adopted ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory (“ASU 2015-11”). ASU 2015-11 requires entities to measure most inventories “at the lower of cost and net realizable value” but does not apply to inventories that are measured by using either the last-in, first-out method or the retail inventory method. The impact on the Company’s consolidated financial statements upon the adoption of this standard was immaterial.
Recent accounting pronouncements	Recent Accounting Standards Update Not Yet Effective In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-09, Compensation — Stock Compensation (718)—Scope of Modification Accounting (ASU 2017-09”). This guidance redefines which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting for a share-based payment. ASU 2017-09 is effective for interim and annual periods after December 15, 2017 and early adoption is permitted in any interim period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements and related disclosure. In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715)-Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). This guidance revises the presentation of employer-sponsored defined benefit pension and other postretirement plans for the net periodic benefit cost in the statement of operations and requires that the service cost component of net periodic benefit be presented in the same income statement line items as other employee compensation costs for services rendered during the period. The other components of the net benefit costs are required to be presented in the statement of operations separately from the service cost component and outside the subtotal of income from operations. This guidance allows only the service cost component of net periodic benefit costs to be eligible for capitalization. ASU 2017-07 is effective for interim and annual periods after December 15, 2018 and early adoption is permitted as of the beginning of an annual reporting period. The Company has not yet determined whether it will elect early adoption and has determined that the adoption of this standard will not have a significant impact on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This standard amends the goodwill impairment test to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, up to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 is effective prospectively for interim and annual periods beginning after December 15, 2019. Early adoption is permitted for interim and annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company has not determined whether it will elect early adoption and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”). This standard provides a framework in determining when a set of assets and activities is a business. ASU 2017-01 is effective for interim and annual periods beginning after December 15, 2017 on a prospective basis. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements and related disclosures. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASC 2016-18”). This standard provides guidance on the classification and presentation of restricted cash in the statement of cash flows and must be applied retrospectively. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). This standard provides guidance on the tax accounting for the transferring and receiving entities upon transfer of an asset. ASU 2016-16 is effective for the Company’s interim and annual periods beginning after December 15, 2017 and should be applied on a modified retrospective basis. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). This standard provides guidance on the classification of certain cash receipts and payments in the statement of cash flows . It is effective, retrospectively, for the Company’s annual and interim reporting periods beginning after December 15, 2017 or prospectively from the earliest date practicable if retrospective application is impracticable. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 amends existing guidance on the impairment of financial assets and adds an impairment model that is based on expected losses rather than incurred losses and requires an entity to recognize as an allowance its estimate of expected credit losses for its financial assets. An entity will apply this guidance through a cumulative-effect adjustment to retained earnings upon adoption (a modified-retrospective approach) while a prospective transition approach is required for debt securities for which an other-than-temporary impairment had been recognized before the effective date. It is effective for the Company’s annual and interim reporting periods beginning after December 15, 2019. Early adoption is permitted. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 introduces a lessee model that requires recognition of assets and liabilities arising from qualified leases on the consolidated balance sheets and consolidated statements of operations and to disclose qualitative and quantitative information about lease transactions. It is effective for interim and annual periods beginning after December 15, 2018. Early adoption is permitted. A modified retrospective transition is required with certain optional practical expedients allowed. The Company is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 revises an entity’s accounting related to (1) the classification and measurement of investments in equity securities and (2) the presentation of certain fair value changes for financial liabilities measured at fair value. It also amends certain disclosure requirements associated with the fair value of financial instruments and is effective for the Company’s annual and interim reporting periods beginning after December 15, 2017. Early adoption is permitted. The Company has not determined whether it will elect early adoption and is in the process of evaluating the impact of the adoption on its consolidated financial statements and related disclosure. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard, along with the amendments issued in 2016 and 2015, provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. ASU 2014-09 is required to be adopted, using either of two methods: (i) retrospective to each prior reporting period presented with the option to elect certain practical expedients as defined within ASU 2014-09; or (ii) retrospective with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application and providing certain additional disclosures. This standard, as amended, is effective for annual and interim periods beginning after December 15, 2017 and permits entities to early adopt for annual and interim reporting periods beginning after December 15, 2016. The Company does not intend to early adopt this guidance and intends to adopt the new standard in the first quarter of 2018. The Company is still evaluating which method that it will adopt under this guidance. While the Company continues to assess the potential impact of the provisions in the new standard on its accounting policies, processes and system requirements, the Company cannot reasonably estimate quantitative information related to the impact of the new standard on its consolidated financial statements at this time.

Net income (loss) per share (Ta

Net income (loss) per share (Tables)	6 Months Ended
	Jun. 30, 2017
Net income (loss) per share
Computation of Basic and Diluted Net Income per Share	The following table sets forth the computation of the basic and diluted net income (loss) per share for the periods indicated (in thousands, except per share amounts): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Numerator: Net income (loss) $ (9,341) $ 2,676 $ (20,863) $ 4,986 Denominator: Weighted average shares used to compute per share amount: Basic 43,219 41,603 42,919 41,362 Dilutive effect of equity awards - 2,717 - 2,680 Diluted 43,219 44,320 42,919 44,042 Basic net income (loss) per share $ (0.22) $ 0.06 $ (0.49) $ 0.12 Diluted net income (loss) per share $ (0.22) $ 0.06 $ (0.49) $ 0.11
Potentially Dilutive Securities Excluded from Computation of Diluted Net Income per Share Attributable to Common Stockholders	The Company has excluded the impact of the following employee stock options, restricted stock units and shares expected to be issued under its employee stock purchase plan from the computation of diluted net income (loss) per share, as their effect would have been antidilutive (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Employee stock options 3,898 474 3,898 492 Restricted stock units 1,663 34 1,663 34 Employee stock purchase plan 186 — 186 — 5,747 508 5,747 526

Cash, cash equivalents, short24

Cash, cash equivalents, short-term investments, and restricted cash (Tables)	6 Months Ended
	Jun. 30, 2017
Cash, cash equivalents, short-term investments, and restricted cash
Summary of Cash, Cash Equivalents and Short-Term investments and Restricted Cash and Investments	The following table summarizes the Company’s cash, cash equivalents, short-term investments and restricted cash (in thousands): June 30, December 31, 2017 2016 Cash and cash equivalents: Cash $ 53,851 $ 58,691 Cash equivalents 19,810 23,809 Cash and cash equivalents $ 73,661 $ 82,500 Short-term investments $ 2,055 $ 19,015 Restricted cash $ 3,290 $ 4,085
Summary of Unrealized Gains and Losses Related to Cash Equivalents and Investments in Marketable Securities	As of June 30, 2017 and December 31, 2016, restricted cash included approximately $2.0 million pursuant to an asset purchase agreement with Optoelectronics Components C o., Ltd. (“APAT OE”) relating to the asset sale closed in January 2017, in addition to the compensating balances relating to the Company’s notes payable issued under its line of credit facilities in China (see Note 8). The following table summarizes the Company’s unrealized gains and losses related to its cash equivalents and short-term investments in marketable securities designated as available-for-sale (in thousands): As of June 30, 2017 As of December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Marketable securities: Money market accounts $ 19,810 $ — $ — $ 19,810 $ 23,809 $ — $ — $ 23,809 Money market funds 1,307 — — 1,307 199 — — 199 Corporate debt securities — — — — 9,438 4 (3) 9,439 Government agency securities — — — — 3,767 — (10) 3,757 U.S. government securities 750 — (2) 748 5,008 — (10) 4,998 Sovereign government bonds — — — — 622 — — 622 Total $ 21,867 $ — $ (2) $ 21,865 $ 42,843 $ 4 $ (23) $ 42,824 Reported as: Cash equivalents $ 19,810 $ — $ — $ 19,810 $ 23,809 $ — $ — $ 23,809 Short-term investments 2,057 — (2) 2,055 19,034 4 (23) 19,015 Total $ 21,867 $ — $ (2) $ 21,865 $ 42,843 $ 4 $ (23) $ 42,824
Maturities of Marketable Securities	AS of June 30, 2017 and December 31, 2016, maturities of marketable securities were as follows (in thousands): June 30, December 31, 2017 2016 Less than 1 year $ 21,865 $ 36,054 Due in 1 to 2 years — 6,468 Due in 3 to 5 years — 302 Total $ 21,865 $ 42,824

Fair value disclosures (Tables)

Fair value disclosures (Tables)	6 Months Ended
	Jun. 30, 2017
Fair value disclosures
Fair Value of Financial Assets	The following table presents the Company's assets that are measured at fair value on a recurring basis (in thousands): As of June 30, 2017 As of December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash equivalents and short-term investments: Money market funds $ 1,307 $ — $ — $ 1,307 $ 199 $ — $ — $ 199 U.S. government securities 748 — — 748 4,998 — — 4,998 Money market accounts — 19,810 — 19,810 — 23,809 — 23,809 Corporate debt securities — — — — — 9,439 — 9,439 Government agency securities — — — — — 3,757 — 3,757 Sovereign government bonds — — — — — 622 — 622 Total $ 2,055 $ 19,810 $ — $ 21,865 $ 5,197 $ 37,627 $ — $ 42,824 Foreign currency forward contracts $ — $ * $ — $ * $ — $ * $ — $ * Mutual funds held in Rabbi Trust, recorded in other long-term assets $ 911 $ — $ — $ 911 $ 622 $ — $ — $ 622 *The fair value of the Company’s foreign currency forward contract was immaterial as of June 30, 2017 and December 31, 2016.
Fair Value of Financial Liabilities	The following table presents the Company's liabilities that are measured at fair value on a recurring basis (in thousands): As of June 30, 2017 As of December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Rusnano payment derivative $ — $ — $ 389 $ 389 $ — $ — $ 389 $ 389 Foreign currency forward contracts — 24 — 24 — 41 — 41 $ — $ 24 $ 389 $ 413 $ — $ 41 $ 389 $ 430

Balance sheet components (Table

Balance sheet components (Tables)	6 Months Ended
	Jun. 30, 2017
Balance sheet components
Accounts Receivable, Net	Accounts receivable, net consists of the following (in thousands): June 30, 2017 December 31, 2016 Accounts receivable $ 56,151 $ 78,143 Trade notes receivable 514 2,892 Allowance for doubtful accounts (140) (425) $ 56,525 $ 80,610
Inventories, net	Inventories, net consist of the following (in thousands): June 30, 2017 December 31, 2016 Raw materials $ 36,609 $ 23,348 Work in process 14,552 10,996 Finished goods (1) 30,167 13,893 $ 81,328 $ 48,237 (1) Finished goods inventory at customer vendor managed inventory locations was $6.6 million and $8.3 million as of June 30, 2017 and December 31, 2016, respectively.
Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Prepaid taxes and taxes receivable $ 13,015 $ 16,102 Deposits and other prepaid expenses 4,279 3,571 Transition service agreement related (Note 5) 14,409 — Other receivable 5,063 2,723 $ 36,766 $ 22,396
Purchased Intangible Assets	Purchased intangible assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Gross Accumulated Net Gross Accumulated Net Assets Amortization Assets Assets Amortization Assets Technology and patents $ 37,200 $ (34,048) $ 3,152 $ 36,918 $ (33,316) $ 3,602 Customer relationships 15,207 (14,380) 827 15,039 (13,990) 1,049 Leasehold interest 1,256 (337) 919 1,226 (315) 911 $ 53,663 $ (48,765) $ 4,898 $ 53,183 $ (47,621) $ 5,562
Amortization Expense of Purchased Intangible Assets	The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Cost of goods sold $ 203 $ 848 $ 465 $ 1,689 Operating expenses 118 460 236 913 Total $ 321 $ 1,308 $ 701 $ 2,602
Estimated Future Amortization Expense of Purchased Intangible Assets	The estimated future amortization expense of purchased intangible assets as of June 30, 2017, is as follows (in thousands): 2017 (remaining six months) $ 640 2018 1,209 2019 806 2020 688 2021 688 Thereafter 867 $ 4,898
Accrued and Other Current Liabilities	Accrued and other current liabilities consist of the following (in thousands): June 30, 2017 December 31, 2016 Employee-related $ 13,371 $ 18,654 Income and other taxes payable 857 3,956 Deferred revenue, current 925 956 Accrued warranty 528 678 Rusnano payment derivative — 389 Asset sale related contingent liabilities (Note 5) 6,851 — Transition service agreement related payables (Note 5) 12,671 — Other accrued expenses 5,522 5,992 $ 40,725 $ 30,625
Warranty Accrual	The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Beginning balance $ 582 $ 1,143 $ 678 $ 1,175 Warranty accruals 34 (203) (28) (101) Settlements (88) (271) (122) (405) Ending balance $ 528 $ 669 $ 528 $ 669
Other Noncurrent Liabilities	Other noncurrent liabilities consist of the following (in thousands): June 30, 2017 December 31, 2016 Pension and other employee-related $ 5,527 $ 5,045 Deferred rent 2,433 1,509 Deferred revenue 1,243 136 Government grant 952 1,048 Deferred income tax liabilities 58 46 Rusnano payment derivative 389 — Asset retirement obligations and other 3,365 1,155 $ 13,967 $ 8,939

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Debt
Carrying Amount and Weighted Average Interest Rate of the Company's Debt	The table below summarizes the carrying amount and weighted average interest rate of the Company’s debt (in thousands, except percentages): June 30, 2017 December 31, 2016 Carrying Interest Carrying Interest Amount Rate Amount Rate Notes payable $ 4,149 — $ 6,390 — Short-term borrowing-Comerica Bank 20,000 3.80 % 23,800 3.37 % Total notes payable and short-term borrowing $ 24,149 $ 30,190 Long-term debt, current and non-current: Mitsubishi Bank loans $ 16,723 1.43 % $ 11,253 1.43 % Unaccreted discount and issuance costs within current portion of long-term debt (120) (108) Unaccreted discount and issuance costs within long-term debt, net of current portion (335) (183) Total long-term debt, net of unaccreted discount and issuance costs $ 16,268 $ 10,962 Reported as: Current portion of long-term debt $ 5,458 $ 747 Long-term debt, net of current portion 10,810 10,215 Total long-term debt, net of unaccreted discount and issuance costs $ 16,268 $ 10,962
Maturities of Long-term Debt	At June 30, 2017, maturities of total long-term debt were as follows (in thousands): 2017 (remaining six months) $ 446 2018 6,030 2019 1,796 2020 1,796 2021 1,796 Thereafter 4,859 $ 16,723

Stockholders' equity (Tables)

Stockholders' equity (Tables)	6 Months Ended
	Jun. 30, 2017
Stockholders’ equity disclosure
Schedule of Accumulated Other Comprehensive Income, Net of Related Taxes	The components of accumulated other comprehensive loss, net of related taxes, were as follows (in thousands): Foreign Currency Translation Adjustments Unrealized Gain (Loss) on Available-For-Sale Securities Defined Benefit Pension Plan Adjustment Total Accumulated Other Comprehensive Loss Balance at December 31, 2016 $ (8,235) $ (19) $ (147) $ (8,401) Other comprehensive income, net of taxes of zero and reclassifications 3,913 16 — 3,929 Balance at June 30, 2017 $ (4,322) $ (3) $ (147) $ (4,472)

Stock-based compensation (Table

Stock-based compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Stock-based compensation
Summary of Stock Based Compensation Expense	The following table summarizes the stock-based compensation expense recognized in the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Cost of goods sold $ 324 $ 719 $ 471 $ 1,308 Research and development 511 556 1,173 1,527 Sales and marketing 313 365 777 1,252 General and administrative 738 590 1,337 1,582 $ 1,886 $ 2,230 $ 3,758 $ 5,669
Estimated Fair Value of Certain Stock-Based Awards Using Black-Scholes-Merton Valuation Model	The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions: Three Months Ended Six Months Ended June 30, June 30, Stock options 2017 2016 2017 2016 Weighted-average expected term (years) 5.99 5.25 5.99 5.20 Weighted-average volatility 65% 63% 65% 63% Risk-free interest rate 2.08% 1.21%-1.38% 2.08% 1.21%-1.76% Expected dividends — % — % — % — % Stock appreciation units Weighted-average expected term (years) 2.33 2.84 2.39 2.94 Weighted-average volatility 71% 62% 71% 62% Risk-free interest rate 0.76%-1.50% 0.59%-0.95% 0.51%-1.50% 0.59%-1.47% Expected dividends — % — % — % — % ESPP Weighted-average expected term (years) 0.68 0.70 0.68 0.70 Weighted-average volatility 55% 70% 55% 70% Risk-free interest rate 0.45%-0.91% 0.08%-0.39% 0.45%-0.91% 0.08%-0.39% Expected dividends — % — % — % — %
Summary of Stock Option and Restricted Stock Unit Activity	The following table summarizes the Company’s stock option and RSU activity during the six months ended June 30, 2017 : Stock Options Restricted Stock Units Weighted Weighted Average Average Number of Exercise Number of Grant Date Shares Price Units Fair Value Balance at December 31, 2016 4,301,340 $ 5.18 2,089,473 $ 10.15 Granted 45,126 9.20 183,177 9.48 Exercised/Converted (402,977) 3.76 (516,478) 7.89 Cancelled/Forfeited (44,977) 9.15 (89,926) 10.65 Balance at June 30, 2017 3,898,512 $ 5.33 1,666,246 $ 10.75

Income taxes (Tables)

Income taxes (Tables)	6 Months Ended
	Jun. 30, 2017
Income taxes
Income (Loss) before Income Taxes	Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Income tax (provision) benefit $ 451 $ (626) $ 618 $ (1,667)

Basis of presentation and sig31

Basis of presentation and significant accounting policies - (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)customer	Jun. 30, 2016USD ($)customer	Jun. 30, 2017USD ($)customeritem	Jun. 30, 2016USD ($)customer	Dec. 31, 2016USD ($)customer	Jul. 31, 2017USD ($)	Jan. 01, 2017USD ($)
Concentration Risk [Line Items]
Working capital	$ 102,800,000		$ 102,800,000
Cash, cash equivalents, short-term investments and restricted cash	79,000,000		79,000,000
Operating losses	(9,701,000)	$ 2,866,000	(21,575,000)	$ 7,568,000
Cash flows from operations			(16,496,000)	$ 23,178,000
Accumulated deficit	(319,541,000)		$ (319,541,000)		$ (298,678,000)
Restructuring plan implementation period			1 year
China
Concentration Risk [Line Items]
Number of credit facilities | item			3
Unused part of credit facility	$ 20,800,000		$ 20,800,000
Expiring in third quarter of 2017
Concentration Risk [Line Items]
Number of credit facilities | item			2
Must be extended to fund planned operations and expenditures over next year [Member]
Concentration Risk [Line Items]
Number of credit facilities | item			1
Accounting Standards Update 2016-09
Concentration Risk [Line Items]
Previously unrecognized tax benefits							$ 8,600,000
Impact of adoption of new accounting policy							$ 0
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers | customer			2		3
Huawei Technologies [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk	37.00%	45.00%	39.00%	49.00%
Ciena Corporation [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk	19.00%	16.00%	16.00%	16.00%
Company Top Ten Customers [Member] | Revenue [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk	89.00%	91.00%	89.00%	91.00%
Number of customers | customer	10	10	10	10
Customer One [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk			36.00%		42.00%
Customer Two [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk			12.00%		12.00%
Customer Three [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Percentage of concentration of credit risk					12.00%
Comerica | United States
Concentration Risk [Line Items]
Credit facility, maximum amount	$ 30,000,000		$ 30,000,000
Line of credit facility	20,000,000		20,000,000
CITIC Bank | China
Concentration Risk [Line Items]
Credit facility, maximum amount	$ 39,200,000		$ 39,200,000
CITIC Bank | China | Subsequent Event
Concentration Risk [Line Items]
Line of credit facility						$ 17,000,000

Net income (loss) per share - C

Net income (loss) per share - Computation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income (loss)	$ (9,341)	$ 2,676	$ (20,863)	$ 4,986
Denominator:
Basic	43,219	41,603	42,919	41,362
Dilutive effect of equity awards		2,717		2,680
Diluted	43,219	44,320	42,919	44,042
Basic net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.12
Diluted net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.11

Net income (loss) per share - P

Net income (loss) per share - Potentially Dilutive Securities Excluded From Computation of Diluted Net Loss per Share Attributable to Common Stockholders (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	5,747	508	5,747	526
Employee Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	3,898	474	3,898	492
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	1,663	34	1,663	34
Employee Stock Purchase Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	186		186

Cash, cash equivalents, short34

Cash, cash equivalents, short-term investments and restricted cash - Short term investments and restricted cash and investments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Cash and cash equivalents:
Cash	$ 53,851	$ 58,691
Cash equivalents	19,810	23,809
Cash and cash equivalents	73,661	82,500	$ 82,476	$ 76,088
Short-term investments	2,055	19,015
Restricted cash and investments:
Restricted cash	3,290	4,085
Optoelectronics Components Co. Ltd.
Restricted cash and investments:
Restricted cash	$ 2,000	$ 2,000

Cash, cash equivalents, short35

Cash, cash equivalents, short-term investments and restricted cash - Summary of unrealized gains and losses (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 21,867	$ 42,843
Gross Unrealized Gains		4
Gross Unrealized Losses	(2)	(23)
Fair Value	21,865	42,824
Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	19,810	23,809
Fair Value	19,810	23,809
Short-Term Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,057	19,034
Gross Unrealized Gains		4
Gross Unrealized Losses	(2)	(23)
Fair Value	2,055	19,015
Money market accounts
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	19,810	23,809
Fair Value	19,810	23,809
Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,307	199
Fair Value	1,307	199
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		9,438
Gross Unrealized Gains		4
Gross Unrealized Losses		(3)
Fair Value		9,439
Government-sponsored enterprise obligations
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		3,767
Gross Unrealized Losses		(10)
Fair Value		3,757
U.S. government securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	750	5,008
Gross Unrealized Losses	(2)	(10)
Fair Value	$ 748	4,998
Sovereign government bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		622
Fair Value		$ 622

Cash, cash equivalents, short36

Cash, cash equivalents, short-term investments and restricted cash - Maturities of marketable securities and additional information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)item	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)item	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Cash, cash equivalents, short-term investments, and restricted cash
Less than 1 year	$ 21,865		$ 21,865		$ 36,054
Due in 1 to 2 years					6,468
Due in 3 to 5 years					302
Total	21,865		21,865		$ 42,824
Impairment losses on its marketable securities	$ 0	$ 0	$ 0	$ 0
Investments in marketable securities in unrealized loss position in excess of 12 months | item	0		0

Fair value measurements- Assets

Fair value measurements- Assets and liabilities measured at fair value on recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		$ 413	$ 430
Assets, fair value	[1]	21,865	42,824
Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value		2,055	5,197
Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		24	41
Assets, fair value	[1]	19,810	37,627
Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		389	389
Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]	1,307	199
Money Market Funds | Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value		1,307	199
U.S. government securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]	748	4,998
U.S. government securities | Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value		748	4,998
Money market accounts
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]	19,810	23,809
Money market accounts | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]	19,810	23,809
Sovereign government bonds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		622
Sovereign government bonds | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		622
Corporate Bonds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		9,439
Corporate Bonds | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		9,439
Government-sponsored enterprise obligations
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		3,757
Government-sponsored enterprise obligations | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]		3,757
Mutual Funds Held in Rabbi Trust [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value	[1]	911	622
Mutual Funds Held in Rabbi Trust [Member] | Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value		911	622
Rusnano Payment Derivative
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		389	389
Rusnano Payment Derivative | Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		389	389
Foreign currency forward contracts
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		24	41
Foreign currency forward contracts | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure		$ 24	$ 41
[1]	The fair value of the Company’s foreign currency forward contract was immaterial as of June 30, 2017 and December 31, 2016.

Fair value measurements - Hedgi

Fair value measurements - Hedging Program (Details) - Foreign exchange contracts $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Average maturities of monthly foreign exchange contracts	1 month
China, Yuan Renminbi
Notional value of derivatives related to economic hedges	$ 18.4

Fair value measurements - Liabi

Fair value measurements - Liabilities measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other current liabilities | Indemnification agreement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent liability in connection with contingent indemnification commitments	$ 6,700
Fair Value, Measurements, Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	413	$ 430
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	24	41
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	389	389
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Other current liabilities | Indemnification agreement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent liability in connection with contingent indemnification commitments	6,700
Rusnano Payment Derivative | Fair Value, Measurements, Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	389	389
Rusnano Payment Derivative | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	389	389
Foreign currency forward contracts | Fair Value, Measurements, Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	24	41
Foreign currency forward contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Liabilities Fair Value disclosure	$ 24	$ 41

Asset sale (Details)

Asset sale (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale			$ 13,953
Reclassification from assets held-for-sale	$ 3,400
Gain within operating income		$ 2,000
Inventories | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale, other			13,100
Property, plant and equipment | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets held for sale, other			$ 800
Optoelectronics Components Co. Ltd.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from post-closing transaction services fees under transition services agreement	1,400
Optoelectronics Components Co. Ltd. | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration received pursuant to asset purchase agreement	25,000
Optoelectronics Components Co. Ltd. | Adjusted consideration | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group consideration adjustment	21,600
Optoelectronics Components Co. Ltd. | Other adjustments to consideration for potential indemnification claims | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal group consideration adjustment	10,000
Optoelectronics Components Co. Ltd. | Assets held for sale | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets sold	12,800
Optoelectronics Components Co. Ltd. | Inventories
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Consideration received pursuant to asset purchase agreement	12,100
Optoelectronics Components Co. Ltd. | Inventories | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets sold	12,100
Optoelectronics Components Co. Ltd. | Property, plant and equipment | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets sold	$ 700
Other current liabilities | Indemnification agreement
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent liability		6,700
Property, plant and equipment | Indemnification agreement
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent liability		$ 200

Balance sheet components - Acco

Balance sheet components - Accounts receivable, net (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Balance sheet components
Accounts receivable	$ 56,151	$ 78,143
Trade notes receivable	514	2,892
Allowance for doubtful accounts	(140)	(425)
Accounts receivable, Net ,Total	$ 56,525	$ 80,610

Balance sheet components - Inve

Balance sheet components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Balance sheet components
Raw materials	$ 36,609	$ 23,348
Work in process	14,552	10,996
Finished goods	30,167	13,893
Inventories	81,328	48,237
Finished goods, at vendor managed inventory locations	$ 6,600	$ 8,300

Balance sheet components - Prep

Balance sheet components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Balance sheet components
Prepaid taxes and taxes receivable	$ 13,015	$ 16,102
Deposits and other prepaid expenses	4,279	3,571
Transition service agreement related (Note 5)	14,409
Other receivable	5,063	2,723
Prepaid expenses and other current assets	$ 36,766	$ 22,396

Balance sheet components - Purc

Balance sheet components - Purchased intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 53,663	$ 53,183
Accumulated Amortization	(48,765)	(47,621)
Net Assets	4,898	5,562
Technology and Patents [Member]
Finite Lived Intangible Assets [Line Items]
Gross Assets	37,200	36,918
Accumulated Amortization	(34,048)	(33,316)
Net Assets	3,152	3,602
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Assets	15,207	15,039
Accumulated Amortization	(14,380)	(13,990)
Net Assets	827	1,049
Leasehold Interest [Member]
Finite Lived Intangible Assets [Line Items]
Gross Assets	1,256	1,226
Accumulated Amortization	(337)	(315)
Net Assets	$ 919	$ 911

Balance sheet components - Amor

Balance sheet components - Amortization expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance sheet components
Cost of goods sold	$ 203	$ 848	$ 465	$ 1,689
Operating expenses	118	460	236	913
Total	$ 321	$ 1,308	$ 701	$ 2,602

Balance sheet components - Esti

Balance sheet components - Estimated future amortization expense of purchased intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Balance sheet components
2017 (remaining six months)	$ 640
2,018	1,209
2,019	806
2,020	688
2,021	688
Thereafter	867
Net Assets	$ 4,898	$ 5,562

Balance sheet components - Accr

Balance sheet components - Accrued and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Balance sheet components
Employee-related	$ 13,371		$ 18,654
Income and other taxes payable	857		3,956
Deferred revenue, current	925		956
Accrued warranty	528	$ 582	678	$ 669	$ 1,143	$ 1,175
Rusnano payment derivative			389
Asset-sale related contingent liabilities (Note 5)	6,851
Transition service agreement related payables (Note 5)	12,671
Other accrued expenses	5,522		5,992
Accrued and other current liabilities	$ 40,725		$ 30,625

Balance sheet components - Warr

Balance sheet components - Warranty accrual (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance sheet components
Beginning balance	$ 582	$ 1,143	$ 678	$ 1,175
Warranty accruals	34	(203)	(28)	(101)
Settlements	(88)	(271)	(122)	(405)
Ending balance	$ 528	$ 669	$ 528	$ 669

Balance sheet components - Othe

Balance sheet components - Other noncurrent liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Balance sheet components
Pension and other employee-related	$ 5,527	$ 5,045
Deferred rent	2,433	1,509
Deferred revenue	1,243	136
Government grant	952	1,048
Deferred income tax liabilities	58	46
Rusnano payment derivative	389
Asset retirement obligations and other	3,365	1,155
Other noncurrent liabilities	$ 13,967	$ 8,939

Restructuring (Details)

Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Restructuring
Restructuring costs incurred	$ 700,000	$ 0	$ 1,000,000	$ 0
Restructuring reserve	$ 200,000		$ 200,000
Restructuring liabilities					$ 0

Debt - Components of Debt Oblig

Debt - Components of Debt Obligations and Weighted Average Interest Rate (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes payable	$ 4,149	$ 6,390
Total notes payable and short-term borrowing	24,149	30,190
Total long-term debt, current and non-current	16,723
Total long-term debt, net of unaccreted discount and issuance costs	16,268	10,962
Current portion of long-term debt	5,458	747
Long-term debt, net of current portion	10,810	10,215
Comerica Bank Term Loan [Member]
Debt Instrument [Line Items]
Bank borrowings-Comerica Bank	$ 20,000	$ 23,800
Short-term Debt Weighted Average Interest Rate	3.80%	3.37%
Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Bank borrowings-Mitsubishi Bank	$ 16,723	$ 11,253
Long-term Debt Weighted Average Interest Rate	1.43%	1.43%
Long Term Debt Current [Member]
Debt Instrument [Line Items]
Unaccreted discount within long-term debt, net of current portion	$ (120)	$ (108)
Long Term Debt Non Current [Member]
Debt Instrument [Line Items]
Unaccreted discount within long-term debt, net of current portion	$ (335)	$ (183)

Debt - Additional Information (

Debt - Additional Information (Details) ¥ in Millions

Feb. 25, 2015JPY (¥)

Feb. 25, 2015USD ($)

Jul. 31, 2017USD ($)item

Mar. 31, 2017JPY (¥)

Jun. 30, 2017USD ($)item

Jun. 30, 2016USD ($)

Dec. 31, 2016USD ($)item

Jun. 30, 2017CNY (¥)

Jun. 30, 2017JPY (¥)

Jun. 30, 2017USD ($)

Mar. 31, 2017USD ($)

Feb. 25, 2015USD ($)

Debt Instrument [Line Items]

Repayment of notes payable

$ 6,599,000

$ 9,283,000

Comerica | Revolving Credit Facility

Debt Instrument [Line Items]

Outstanding balance of line of credit facilities

$ 23,800,000

$ 20,000,000

Mitsubishi Bank [Member]

Debt Instrument [Line Items]

Line of credit facility

¥ 1,200,000,000

11,100,000

Unamortized debt issuance costs

¥ 50,000,000

$ 500,000

Libor Plus Rate [Member] | Comerica | Revolving Credit Facility

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

2.75%

Credit Facility Base Rate [Member] | Comerica | Revolving Credit Facility

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.75%

Federal Funds Effective Rate [Member] | Comerica | Revolving Credit Facility

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.00%

Daily Adjusting LIBOR Rate [member] | Comerica | Revolving Credit Facility

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.00%

Line of credit facility, interest rate

3.37%

3.80%

3.80%

3.80%

Term Loan B [Member] | Mitsubishi Bank [Member]

Debt Instrument [Line Items]

Debt, aggregate principal amount

¥ 1,000,000,000

$ 8,400,000

Debt, periodic principal payments | ¥

8,333,000

Debt, lump sum payment on the maturity date | ¥

8,373,000

Loan structuring fee including consumption tax

¥ 40,500,000

$ 300,000

Term Loan B [Member] | Tokyo Interbank Offer Rate [Member] | Mitsubishi Bank [Member]

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.40%

1.40%

Term Loan A [Member] | Mitsubishi Bank [Member]

Debt Instrument [Line Items]

Debt, aggregate principal amount

¥ 500,000,000

$ 4,200,000

Term Loan A [Member] | Tokyo Interbank Offer Rate [Member] | Mitsubishi Bank [Member]

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.40%

1.40%

Capital Expenditures Credit Facility Expires April 30, 2017 | Comerica

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$ 30,000,000

Capital Expenditures Credit Facilty Maturing August 31, 2017 | Subsidiary in China | Comerica

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

17,000,000

Maximum indebtedness under debt covenant

20,000,000

2017 Mitsubishi Bank Loan

Debt Instrument [Line Items]

Line of credit facility

¥ 625,300,000

5,600,000

Debt Instrument, Term

72 months

Debt, aggregate principal amount

¥ 690,000,000

$ 6,200,000

Debt Instrument, Maturity Date Range, Start

Apr. 1, 2018

2017 Mitsubishi Bank Loan | Tokyo Interbank Offer Rate [Member]

Debt Instrument [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.00%

Loans Payable | First Credit Facility Expires July 2019 | Subsidiary in China

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

¥ 120

17,700,000

Loans Payable | Second Credit Facility Expires September 2017 | Subsidiary in China

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

266

39,200,000

Percentage of compensating balance requirement for bank acceptance drafts

30.00%

Bankers Acceptance

Debt Instrument [Line Items]

Restricted cash and investments, current

$ 2,100,000

1,200,000

Bankers Acceptance | Minimum

Debt Instrument [Line Items]

Debt Instrument, Term

3 months

Bankers Acceptance | Subsidiary in China

Debt Instrument [Line Items]

Line of credit facility

$ 6,400,000

4,100,000

Bankers Acceptance | Subsidiary in China | Maximum

Debt Instrument [Line Items]

Debt Instrument, Term

6 months

Bankers Acceptance | First Credit Facility Expires July 2019 | Subsidiary in China

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

171.4

25,300,000

Percentage of compensating balance requirement for bank acceptance drafts

30.00%

Bankers Acceptance | Second Credit Facility Expires September 2017 | Subsidiary in China

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

380

56,100,000

Bankers Acceptance | Third Credit Facility Expires July 2019 | Subsidiary in China

Debt Instrument [Line Items]

Percentage of compensating balance requirement for bank acceptance drafts

30.00%

Letter of Credit

Debt Instrument [Line Items]

Number of letters of credit | item

3

Short-term line of credit facility

$ 1,600,000

Letter of Credit | Second Credit Facility Expires September 2017 | Subsidiary in China

Debt Instrument [Line Items]

Percentage of compensating balance requirement for bank acceptance drafts

30.00%

China

Debt Instrument [Line Items]

Number of short-term credit facilities | item

3

Line of Credit Facility, Remaining Borrowing Capacity

20,800,000

China | Loans Payable | Third Credit Facility Expires July 2019

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

30

4,400,000

China | Short Term Loans | Third Credit Facility Expires July 2019

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

¥ 42.9

$ 6,300,000

Subsequent Event | Subsidiary in China | Revolving Credit Facility

Debt Instrument [Line Items]

Number of short-term credit facilities | item

1

Line of credit facility

$ 17,000,000

Interest rate

4.01%

Debt - Maturities of Long-Term

Debt - Maturities of Long-Term debt (Details) $ in Thousands	Jun. 30, 2017USD ($)
Debt
2017 (remaining six months)	$ 446
2,018	6,030
2,019	1,796
2,020	1,796
2,021	1,796
Thereafter	4,859
Total long-term debt, current and non-current	$ 16,723

Japan pension plans - (Details)

Japan pension plans - (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension liability	$ 4.8	$ 4.8
Accrued and other current liabilities
Defined Benefit Plan Disclosure [Line Items]
Pension liability included in accrued and other current liabilities	$ 0.2	$ 0.4

Commitments and Contingencies (

Commitments and Contingencies (Details) ft² in Thousands, € in Millions

Jun. 16, 2017USD ($)

Jun. 01, 2017USD ($)ft²

Dec. 27, 2016USD ($)

Mar. 23, 2015EUR (€)

Mar. 23, 2015USD ($)

Sep. 16, 2013USD ($)

Sep. 30, 2027USD ($)

Apr. 30, 2017USD ($)

Sep. 30, 2016ft²

Aug. 31, 2016USD ($)

Jun. 30, 2017USD ($)

Jun. 30, 2016USD ($)

Jun. 30, 2017USD ($)

Jun. 30, 2016USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2010claimdefendant

Dec. 31, 2015USD ($)

Mar. 31, 2015USD ($)

Commitments And Contingencies Disclosure [Line Items]

Operating leases, future minimum payments due

$ 32,800,000

$ 32,800,000

Rent expense

1,300,000

$ 500,000

2,300,000

$ 1,100,000

Operating leases, future minimum, sublease receipts

1,000,000

$ 1,000,000

Number of defendants | defendant

4

Payment for legal settlement

$ 250,000

Area of office lease | ft²

39

64

Office lease term, months

123 months

129 months

Office lease, monthly rental rate

$ 41,388

$ 144,000

Other Liabilities Noncurrent Other

3,365,000

$ 3,365,000

$ 1,155,000

Office and laboratory lease period free of charge

9 months

Amount of contribution

18,800,000

Expected Costs to Transfer Product Line

$ 100,000

Penalty payment derivative

400,000

$ 400,000

400,000

Revenue

73,214,000

$ 99,129,000

144,902,000

$ 198,274,000

Additional paid-in capital

539,525,000

539,525,000

$ 532,378,000

Restoration Costs Upon Lease Termination

3,100,000

3,100,000

Rusnano

Commitments And Contingencies Disclosure [Line Items]

Other non-current liability

0

0

Finisar Corp

Commitments And Contingencies Disclosure [Line Items]

Loss Contingency, Pending Claims, Number | claim

2

Lestina International Ltd. litigation

Commitments And Contingencies Disclosure [Line Items]

Damages sought, value

$ 3,000,000

APAT Arbitration

Commitments And Contingencies Disclosure [Line Items]

Damages sought, value

$ 1,500,000

Maximum

Commitments And Contingencies Disclosure [Line Items]

Office lease, monthly rental rate

194,000

Pending Litigation | Laser 2000 case

Commitments And Contingencies Disclosure [Line Items]

Partial settlement of claims

$ 492,000

Accrual for estimated net litigation expense

€ 1

$ 1,100,000

Litigation liability accrued

$ 300,000

Embedded Derivative Financial Instruments [Member] | Maximum

Commitments And Contingencies Disclosure [Line Items]

Other non-current liability

$ 5,000,000

Indemnification agreement

Commitments And Contingencies Disclosure [Line Items]

Payment for legal settlement

0

Lease termination

Commitments And Contingencies Disclosure [Line Items]

Other Liabilities Noncurrent Other

700,000

700,000

Scenario, Forecast

Commitments And Contingencies Disclosure [Line Items]

Office lease, monthly rental rate

$ 72,525

Scenario, Forecast | RUSSIAN FEDERATION

Commitments And Contingencies Disclosure [Line Items]

Exit fees for future

$ 2,000,000

Private Placement [Member] | Performance Guarantee [Member]

Commitments And Contingencies Disclosure [Line Items]

Other non-current liability

$ 30,000,000

$ 30,000,000

Stockholders' Equity - Common s

Stockholders' Equity - Common stock, resale registration statement, and follow-on public offering (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Class Of Stock [Line Items]
Common Stock Shares Authorized	100,000,000		100,000,000		100,000,000
Common stock, par value	$ 0.0025		$ 0.0025		$ 0.0025
Other offering expenses			$ 117
Reclassified out of accumulated other comprehensive loss for realized gains or losses on available for sale securities	$ 0	$ 0	0	$ 0
Accumulated deficit subject to restriction			$ 8,700		$ 8,700
Minimum
Class Of Stock [Line Items]
Accumulated profits			10.00%		10.00%
Employee Stock Options
Class Of Stock [Line Items]
Common stock	7,807,121		7,807,121
Sale of common stock upon the exercise of overallotment option			402,977
Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock	426,217		426,217

Stockholders' Equity - Accumula

Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Balance			$ (8,401,000)
Other comprehensive income, net of taxes of zero and reclassifications	$ 1,458,000	$ (1,746,000)	3,929,000	$ 347,000
Balance	(4,472,000)		(4,472,000)
Other comprehensive income, tax			0
Foreign Currency Translation Adjustments
Balance			(8,235,000)
Other comprehensive income, net of taxes of zero and reclassifications			3,913,000
Balance	(4,322,000)		(4,322,000)
Unrealized (Loss) Gain on Available-For-Sale Securities
Balance			(19,000)
Other comprehensive income, net of taxes of zero and reclassifications			16,000
Balance	(3,000)		(3,000)
Defined Benefit Pension Plan Adjustment
Balance			(147,000)
Balance	$ (147,000)		$ (147,000)

Stock-based compensation - Stoc

Stock-based compensation - Stock-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share Based Compensation		$ 1,886	$ 2,230	$ 3,758	$ 5,669
Cost of Goods Sold [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share Based Compensation		324	719	471	1,308
Research and Development Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share Based Compensation		511	556	1,173	1,527
Selling and Marketing Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share Based Compensation		313	365	777	1,252
General and Administrative Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share Based Compensation		$ 738	$ 590	$ 1,337	$ 1,582
Stock Appreciation Units (SAUs) [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number	1.1
Market Based Awards Member
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number	0.2
Market Based Awards Vesting, Threshold Consecutive Trading Days	20 days
Share Price	$ 15

Stock-based compensation - Esti

Stock-based compensation - Estimated fair vale of stock-based awards (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average expected term (years)	5 years 11 months 27 days	5 years 3 months	5 years 11 months 27 days	5 years 2 months 12 days
Weighted-average volatility	65.00%	63.00%	65.00%	63.00%
Risk-free interest rate	2.08%
Risk-free interest rate Minimum		1.21%		1.21%
Risk-free interest rate Maximum		1.38%		1.76%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Stock Appreciation Units (SAUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average expected term (years)	2 years 3 months 29 days	2 years 10 months 2 days	2 years 4 months 21 days	2 years 11 months 9 days
Weighted-average volatility	71.00%	62.00%	71.00%	62.00%
Risk-free interest rate Minimum	0.76%	0.59%	0.51%	0.59%
Risk-free interest rate Maximum	1.50%	0.95%	1.50%	1.47%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average expected term (years)	8 months 5 days	8 months 12 days	8 months 5 days	8 months 12 days
Weighted-average volatility	55.00%	70.00%	55.00%	70.00%
Risk-free interest rate Minimum	0.45%	0.08%	0.45%	0.08%
Risk-free interest rate Maximum	0.91%	0.39%	0.91%	0.39%
Expected dividends	0.00%	0.00%	0.00%	0.00%

Stock-based compensation - St60

Stock-based compensation - Stock Options and RSUs (Details)	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Employee Stock Options
Number of Shares
Beginning Balance | shares	4,301,340
Granted | shares	45,126
Exercised/Converted | shares	(402,977)
Cancelled/Forfeited | shares	(44,977)
Ending Balance | shares	3,898,512
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 5.18
Granted | $ / shares	9.20
Exercised/Converted | $ / shares	3.76
Cancelled/Forfeited | $ / shares	9.15
Ending Balance | $ / shares	$ 5.33
Restricted stock units
Number of Units
Beginning Balance | shares	2,089,473
Granted | shares	183,177
Exercised/Converted | shares	(516,478)
Cancelled/Forfeited | shares	(89,926)
Ending Balance | shares	1,666,246
Weighted Average Exercise Price
Beginning Balance | $ / shares	$ 10.15
Granted | $ / shares	9.48
Exercised/Converted | $ / shares	7.89
Cancelled/Forfeited | $ / shares	10.65
Ending Balance | $ / shares	$ 10.75

Stock-based compensation - St61

Stock-based compensation - Stock appreciation units (Details) - Stock Appreciation Units (SAUs) [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance-based stock appreciation units	0	0	0	0
Shares outstanding	264,755		264,755		286,768
SAU-related liabilities	$ 1.2		$ 1.2		$ 2

Stock-Based Compensation - Empl

Stock-Based Compensation - Employee Stock Purchase Plan (Details) $ in Millions	Jun. 30, 2017USD ($)
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 0.2

Income taxes - Provision for in

Income taxes - Provision for income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income taxes
Income tax (provision) benefit	$ 451	$ (626)	$ 618	$ (1,667)

Income taxes - Additional infor

Income taxes - Additional information (Details)	6 Months Ended
	Jun. 30, 2017USD ($)
Income Taxes [Line Items]
Changes to the amounts of uncertain tax positions previously determined	$ 0
Foreign Country [Member] | Subsidiary in China
Income Taxes [Line Items]
Preferential rate	15.00%
Income tax statutory rate	25.00%
Corporate effective income tax rate	25.00%

Subsequent events (Details)

Subsequent events (Details) - Subsequent Event - Subsidiary in China - Revolving Credit Facility $ in Millions	1 Months Ended
	Jul. 31, 2017USD ($)item
Subsequent Event [Line Items]
Line Of Credit | $	$ 17
Number of short-term credit facilities | item	1
Interest rate	4.01%