Neophotonics (NPTN) 10-Q 26 Jul 22 2022 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Jul. 18, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-35061
Entity Registrant Name	NeoPhotonics Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3253730
Entity Address, Address Line One	3081 Zanker Road
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95134
City Area Code	408
Local Phone Number	232-9200
Title of 12(b) Security	Common Stock, $0.0025 par value
Trading Symbol	NPTN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		53,688,898
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001227025
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 77,079	$ 77,833
Short-term investments	27,720	27,675
Restricted cash	38	87
Accounts receivable, net	68,460	55,324
Inventories	65,510	52,896
Prepaid expenses and other current assets	18,927	16,246
Total current assets	257,734	230,061
Property, plant and equipment, net	49,191	54,190
Operating lease right-of-use assets	12,091	13,201
Purchased intangible assets, net	787	844
Goodwill	1,115	1,115
Other long-term assets	5,636	6,156
Total assets	326,554	305,567
Current liabilities:
Accounts payable	69,685	58,125
Short-term borrowing, net	0	14,914
Current portion of long-term debt	2,449	2,928
Accrued and other current liabilities	29,327	30,008
Total current liabilities	101,461	105,975
Long-term debt, net of current portion	23,945	25,753
Related party long-term debt	29,954	0
Operating lease liabilities, noncurrent	12,107	13,441
Other noncurrent liabilities	6,813	7,437
Total liabilities	174,280	152,606
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.0025 par value, 10,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.0025 par value, 100,000 shares authorized; at June 30, 2022, 53,568 shares issued and outstanding; at December 31, 2021, 53,113 shares issued and outstanding	134	133
Additional paid-in capital	614,553	610,085
Accumulated other comprehensive income (loss)	(8,782)	2,376
Accumulated deficit	(453,631)	(459,633)
Total stockholders’ equity	152,274	152,961
Total liabilities and stockholders’ equity	$ 326,554	$ 305,567

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.0025	$ 0.0025
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0025	$ 0.0025
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	53,568,000	53,113,000
Common stock, shares outstanding (in shares)	53,568,000	53,113,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 95,006	$ 65,010	$ 184,274	$ 125,935
Cost of goods sold	61,935	55,135	123,914	102,721
Gross profit	33,071	9,875	60,360	23,214
Operating expenses:
Research and development	14,736	15,410	29,834	28,508
Sales and marketing	3,742	3,362	7,428	7,227
General and administrative	9,228	7,398	19,022	14,692
Acquisition and asset sale related costs	638	(36)	1,543	127
Restructuring charges	0	22	0	22
Asset impairment charges	30	0	443	0
Facility shut down related costs	209	0	509	0
Litigation settlements	(12)	0	37	0
Gain on asset sale	(1,866)	0	(1,980)	0
Total operating expenses	26,705	26,156	56,836	50,576
Income (loss) from operations	6,366	(16,281)	3,524	(27,362)
Interest income	147	140	218	245
Interest expense	(510)	(220)	(865)	(447)
Other income (expense), net	5,823	(880)	6,218	263
Total interest and other income (expense), net	5,460	(960)	5,571	61
Income (loss) before income taxes	11,826	(17,241)	9,095	(27,301)
Income tax provision	(2,521)	(192)	(3,093)	(823)
Net income (loss)	$ 9,305	$ (17,433)	$ 6,002	$ (28,124)
Basic net income (loss) per share (USD per share)	$ 0.17	$ (0.34)	$ 0.11	$ (0.55)
Diluted net income (loss) per share (USD per share)	$ 0.17	$ (0.34)	$ 0.11	$ (0.55)
Weighted average shares used to compute basic net income (loss) per share (in shares)	53,488	51,634	53,318	51,178
Weighted average shares used to compute diluted net income (loss) per share (in shares)	56,095	51,634	55,999	51,178

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 9,305	$ (17,433)	$ 6,002	$ (28,124)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(10,150)	2,031	(11,158)	(312)
Total other comprehensive income (loss)	(10,150)	2,031	(11,158)	(312)
Comprehensive income (loss)	$ (845)	$ (15,402)	$ (5,156)	$ (28,436)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2020		50,457
Beginning balance at Dec. 31, 2020	$ 180,407	$ 126	$ 597,460	$ 1,735	$ (418,914)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(28,436)			(312)	(28,124)
Issuance of common stock upon exercise of stock options (in shares)		398
Issuance of common stock upon exercise of stock options	2,155	$ 1	2,154
Issuance of common stock under employee stock purchase plan (in shares)		235
Issuance of common stock under employee stock purchase plan	1,549	$ 1	1,548
Issuance of common stock for vested restricted stock units (in shares)		1,305
Issuance of common stock for vested restricted stock units	0	$ 3	(3)
Tax withholding related to vesting of restricted stock units (in shares)		(315)
Tax withholding related to vesting of restricted stock units	(3,683)	$ (1)	(3,682)
Stock-based compensation costs	5,400		5,400
Ending Balance (in shares) at Jun. 30, 2021		52,080
Ending balance at Jun. 30, 2021	157,392	$ 130	602,877	1,423	(447,038)
Beginning balance (in shares) at Mar. 31, 2021		51,009
Beginning balance at Mar. 31, 2021	169,659	$ 128	599,744	(608)	(429,605)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(15,402)			2,031	(17,433)
Issuance of common stock upon exercise of stock options (in shares)		199
Issuance of common stock upon exercise of stock options	1,045		1,045
Issuance of common stock under employee stock purchase plan (in shares)		235
Issuance of common stock under employee stock purchase plan	1,549	$ 1	1,548
Issuance of common stock for vested restricted stock units (in shares)		802
Issuance of common stock for vested restricted stock units	0	$ 2	(2)
Tax withholding related to vesting of restricted stock units (in shares)		(165)
Tax withholding related to vesting of restricted stock units	(1,847)	$ (1)	(1,846)
Stock-based compensation costs	2,388		2,388
Ending Balance (in shares) at Jun. 30, 2021		52,080
Ending balance at Jun. 30, 2021	157,392	$ 130	602,877	1,423	(447,038)
Beginning balance (in shares) at Dec. 31, 2021		53,113
Beginning balance at Dec. 31, 2021	152,961	$ 133	610,085	2,376	(459,633)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(5,156)			(11,158)	6,002
Issuance of common stock upon exercise of stock options (in shares)		114
Issuance of common stock upon exercise of stock options	534		534
Issuance of common stock for vested restricted stock units (in shares)		421
Issuance of common stock for vested restricted stock units	0	$ 1	(1)
Tax withholding related to vesting of restricted stock units (in shares)		(80)
Tax withholding related to vesting of restricted stock units	(1,219)		(1,219)
Stock-based compensation costs	5,154		5,154
Ending Balance (in shares) at Jun. 30, 2022		53,568
Ending balance at Jun. 30, 2022	152,274	$ 134	614,553	(8,782)	(453,631)
Beginning balance (in shares) at Mar. 31, 2022		53,210
Beginning balance at Mar. 31, 2022	151,511	$ 133	612,946	1,368	(462,936)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(845)			(10,150)	9,305
Issuance of common stock upon exercise of stock options (in shares)		40
Issuance of common stock upon exercise of stock options	167		167
Issuance of common stock for vested restricted stock units (in shares)		395
Issuance of common stock for vested restricted stock units	0	$ 1	(1)
Tax withholding related to vesting of restricted stock units (in shares)		(77)
Tax withholding related to vesting of restricted stock units	(1,171)		(1,171)
Stock-based compensation costs	2,612		2,612
Ending Balance (in shares) at Jun. 30, 2022		53,568
Ending balance at Jun. 30, 2022	$ 152,274	$ 134	$ 614,553	$ (8,782)	$ (453,631)

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income (loss)	$ 6,002	$ (28,124)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	7,524	12,486
Stock-based compensation expense	5,224	5,617
Deferred taxes	1,002	989
Others	245	171
Gain on sale of assets and other write-offs	(1,980)	(14)
Allowance for doubtful accounts	0	(1)
Write-down of inventories	3,708	6,096
Amortization of operating lease right-of-use assets	1,028	1,025
Foreign currency remeasurement	(7,462)	(129)
Change in operating assets and liabilities:
Accounts receivable	(13,137)	(2,532)
Inventories	(19,198)	(3,836)
Prepaid expenses and other assets	(4,198)	4,058
Accounts payable	13,545	2,294
Accrued and other liabilities	(2,380)	(19,775)
Net cash used in operating activities	(10,077)	(21,675)
Cash flows from investing activities
Purchase of property, plant and equipment	(5,202)	(5,461)
Proceeds from sale of property, plant and equipment and other assets	2,029	1,013
Purchase of marketable securities	(25,045)	(22,504)
Proceeds from sale of marketable securities	25,416	22,501
Net cash used in investing activities	(2,802)	(4,451)
Cash flows from financing activities
Proceeds from exercise of stock options and issuance of stock under ESPP	605	4,143
Tax withholding on restricted stock units	(1,219)	(3,683)
Proceeds from related party term loan, net of debt issuance costs	29,942	0
Repayment of bank loans	(15,987)	(2,662)
Repayment of finance lease liabilities	(50)	(46)
Net cash provided by (used in) financing activities	13,291	(2,248)
Effect of exchange rates on cash, cash equivalents and restricted cash	(1,215)	99
Net decrease in cash, cash equivalents and restricted cash	(803)	(28,275)
Cash, cash equivalents and restricted cash at the beginning of the period	77,920	95,606
Cash, cash equivalents and restricted cash at the end of the period	77,117	67,331
Supplemental disclosure of non-cash investing and financing activities:
Unpaid property, plant and equipment in accounts payable	1,132	1,952
Right-of-use asset in exchange for a lease liability	$ 0	$ 1,645

The Company, basis of presentat

The Company, basis of presentation and significant accounting policies	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company, basis of presentation and significant accounting policies	The Company, 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, 2022 and for the three and six months ended June 30, 2022 and 2021, 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. These condensed consolidated financial statements do not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”) and 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, 2021. The results of operations for the three and six months ended June 30, 2022 are not necessarily indicative of the results expected for the entire fiscal year. All intercompany accounts and transactions have been eliminated. Proposed Merger with Lumentum Holdings Inc. On November 3, 2021, we the Company entered into an Agreement and Plan of Merger with Lumentum Holdings Inc., a Delaware corporation (“Lumentum”) and Neptune Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Lumentum (“Merger Sub”), (the “Merger Agreement”). Pursuant to the terms of the Merger Agreement, the Company will be acquired by Lumentum through a merger of Merger Sub with and into the Company (the “Merger”), with NeoPhotonics Corporation surviving the Merger as a wholly owned subsidiary of Lumentum. Consummation of the Merger is subject to customary closing conditions, including approval from the State Administration for Market Regulation of the People’s Republic of China ("SAMR") which the parties hope to receive in the second half of calendar year 2022, as previously announced. If the Merger is not completed by August 3, 2022, the Merger Agreement termination date will be automatically extended until November 3, 2022 and will automatically be extended again to February 3, 2023 if the closing is delayed due to certain closing conditions related to antitrust laws not being satisfied but all other conditions to the closing being satisfied or satisfiable at the closing. The parties may also terminate the Merger Agreement under certain other circumstances, including by mutual written consent of both parties. 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 and inflation levels; the highly cyclical nature of the industries the Company serves; successful and timely completion of product design efforts; the ability of the Company to sell its new products into new market segments; trade restrictions by the United States against the Company's customers in China, as well as potential retaliatory trade actions taken by China; the loss of any of its larger customers; restrictions on the Company's ability to sell to foreign customers due to additional U.S. or new China trade laws, regulations and requirements; disruptions of the supply chain of components needed for its products; 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; and new product design introductions by competitors. The inputs into the Company’s judgments and estimates consider the economic implications of the Covid-19 pandemic and supply chain implications as the Company knows them, on its critical and significant accounting estimates. The extent to which the Covid-19 pandemic may impact its business will depend on future developments, which are highly uncertain, such as the duration of the outbreak, travel restrictions, governmental mandates issued to mitigate the spread of the disease, business closures, economic disruptions, and the effectiveness of actions taken to contain and treat the virus. Accordingly, future adverse developments with respect to the Covid-19 pandemic, persistent inflation and economic uncertainty and the impacts of semiconductor supply shortages may have a negative impact on its results of operations. Concentration In the three months ended June 30, 2022, three customers were each greater than 10% of the Company’s total revenue, representing 71% of total revenue, and the Company's top five customers represented approximately 83% of the Company’s total revenue. In the three months ended June 30, 2021, three customers each were greater than 10% of revenue, representing 61% of total revenue, and the Company's top five customers during this period represented 77% of total revenue. In the six months ended June 30, 2022, three customers were each greater than 10% of the Company’s total revenue, representing 69% of total revenue, and the Company's top five customers represented approximately 81% of the Company’s total revenue. In the six months ended June 30, 2021, four customers each were greater than 10% of revenue, representing 66% of total revenue, and the Company's top five customers during this period represented 76% of total revenue. As of June 30, 2022, three customers accounted for a total of 65% of the Company’s total accounts receivable. As of December 31, 2021, three customers accounted for a total of 35% of the Company’s total 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 and recoverability of long-lived assets; valuation allowances for deferred tax assets; valuation of excess and obsolete inventories; warranty reserves; and recognition of stock-based compensation, among others. Actual results could differ from these estimates. Long-lived Assets The Company assesses the impairment of long-lived assets whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss would be recognized when the sum of the future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. The estimated future cash flows are based upon, among other things, assumptions about expected future operating performance and may differ from actual cash flows. Due to the additional restrictions imposed by the U.S. Bureau of Industry and Security ("BIS"), an agency of the U.S. Department of Commerce, which became effective in September 2020, and the expected loss of business from Huawei, the Company performed a recoverability test in the fourth quarter of 2021 and determined there was no impairment of long-lived assets. Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, other current liabilities and operating lease liabilities on the Company's condensed consolidated balance sheets. Finance leases are included in property, plant and equipment, current portion of long-term debt and long-term debt, net of current portion on the condensed consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company's leases do not provide an implicit rate, the Company uses an estimate of its incremental borrowing rate based on observed market data and other information available at the lease commencement date. The operating lease ROU assets also include any lease payments made and exclude lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. The Company does not separate lease and non-lease components but rather account for each separate component as a single lease component for all underlying classes of assets. Variable lease payments are expensed as incurred and are not included within the operating lease ROU asset and lease liability calculation. Variable lease payments primarily include reimbursements of costs incurred by lessors for common area maintenance and utilities. Lease expense for minimum operating lease payments is recognized on a straight-line basis over the lease term. Accounting Pronouncements Recently Adopted In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes. This guidance became effective for fiscal years beginning after December 15, 2020. The Company adopted this ASU in the first quarter of 2021 and the adoption of this standard did not have a material impact on the Company's consolidated financial statements. Recent Accounting Pronouncements Not Yet Effective 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. In November 2019, the FASB issued ASU 2019-10, according to which, the new standard is effective for smaller reporting companies (“SRC”) as defined by the SEC, for fiscal years beginning after December 15, 2022 including interim periods within those fiscal years. The Company is in the process of evaluating the impact and timing of the adoption on its consolidated financial statements and related disclosures.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Product revenue The Company develops, manufactures and sells lasers and other high-speed optoelectronic products that transmit, receive, modify and switch high-speed digital optical signals for communications networks. Revenue is derived primarily from the sale of optoelectronic laser, component and module hardware products. The Company sells its products worldwide, primarily to leading network equipment manufacturers. Revenue recognition Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. The Company generally bears all costs, risk of loss or damage and retains title to the goods up to the point of transfer of control of promised products to customer. Revenue related to the sale of consignment inventories at customer vendor managed locations is not recognized until the products are pulled from consignment inventories by customers. In instances where acceptance of the product or solutions is specified by the customer, revenue is deferred until such required acceptance criteria have been met. Shipping and handling costs are included in the cost of goods sold. The Company presents revenue net of sales taxes and any similar assessments. The Company’s performance obligations relate to contracts with a duration of less than one year. The Company elected to apply the practical expedient provided in Accounting Standard Codification Topic 606, “Revenue from Contracts with Customers” and, therefore, is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. Nature of products Revenue from the sale of hardware products is recognized upon transfer of control to the customer. The performance obligation for the sale of hardware products is satisfied at a point in time. The Company has aligned its products in two groups - High Speed Products and Network Products and Solutions. The following presents revenue by product group (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 High Speed Products $ 88,999 $ 61,032 $ 172,580 $ 118,305 Network Products and Solutions 6,007 3,978 11,694 7,630 Total revenue $ 95,006 $ 65,010 $ 184,274 $ 125,935 The following table presents the Company's revenue information by geographical region. Revenue is classified based on the ship to location requested by the customer. Such classification recognizes that for many customers, including those in North America or in Europe, designated shipping points are often in China or elsewhere in Asia (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 China $ 16,389 $ 24,940 $ 36,417 $ 40,183 Americas 12,959 5,997 26,654 11,188 Rest of world 65,658 34,073 121,203 74,564 Total revenue $ 95,006 $ 65,010 $ 184,274 $ 125,935 Deferred revenue The Company records deferred revenue when cash payments are received or due in advance of the Company's performance. The deferred revenue balances were immaterial as of June 30, 2022 and December 31, 2021. Contract assets Contract assets are rights to consideration in exchange for goods or services that the Company has transferred to a customer when such right is conditional on something other than the passage of time. Contract assets exclude any amounts presented as an accounts receivable. There were no contract assets balances as of June 30, 2022 and December 31, 2021. Refund liabilities The Company recognizes a refund liability if the Company receives consideration from a customer and expects to refund some or all of that consideration to the customer. The refund liabilities as of June 30, 2022 and December 31, 2021 were immaterial.

Net income (loss) per share

Net income (loss) per share	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) per share	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 2022 2021 2022 2021 Numerator: Net income (loss) $ 9,305 $ (17,433) $ 6,002 $ (28,124) Denominator: Weighted average shares used to compute per share amount: Basic 53,488 51,634 53,318 51,178 Diluted 56,095 51,634 55,999 51,178 Basic net income (loss) per share $ 0.17 $ (0.34) $ 0.11 $ (0.55) Diluted net income (loss) per share $ 0.17 $ (0.34) $ 0.11 $ (0.55) The Company has excluded the impact of the following outstanding employee stock options and restricted stock units as well as the shares that were 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 2022 2021 2022 2021 Employee stock options 5 1,734 5 1,734 Restricted stock units 1 2,465 1 2,465 Market-based restricted stock units — 265 — 265 Performance-based restricted stock units 240 75 240 75 Employee stock purchase plan — 132 — 132 246 4,671 246 4,671

Cash, cash equivalents, short-t

Cash, cash equivalents, short-term investments, and restricted cash	6 Months Ended
	Jun. 30, 2022
Cash and Cash Equivalents [Abstract]
Cash, cash equivalents, short-term investments, and restricted cash	Cash, cash equivalents, short-term investments and restricted cash The following table summarizes the Company’s cash, cash equivalents and restricted cash (in thousands): June 30, 2022 December 31, 2021 Cash and cash equivalents $ 77,079 $ 77,833 Restricted cash 38 87 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 77,117 $ 77,920 As a result of sanctions imposed by the U.S. Treasury on the country of Russia's financial institutions in February 2022, the total cash balance held in the Company's Russian subsidiary NeoPhotonics Technics LLC, of $0.3 million, was written off to Asset impairment charges during the six months ended June 30, 2022. The following table summarizes the Company’s unrealized gains and losses related to its short-term investments in marketable securities designated as available-for-sale (in thousands): As of June 30, 2022 As of December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Marketable securities: Money market funds $ 27,720 $ — $ — $ 27,720 $ 27,675 $ — $ — $ 27,675 Reported as: Short-term investments $ 27,720 $ 27,675 As of June 30, 2022 and December 31, 2021, maturities of marketable securities were less than one year. There were no realized gains and losses on the sale of marketable securities during the three and six months ended June 30, 2022 and 2021. The Company did not recognize any impairment losses on its marketable securities during the three and six months ended June 30, 2022 or 2021. As of June 30, 2022, 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, 2022
Fair Value Disclosures [Abstract]
Fair value disclosures	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, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Short-term investments: Money market funds $ 27,720 $ — $ — $ 27,720 $ 27,675 $ — $ — $ 27,675 Other long-term assets: Mutual funds held in Rabbi Trust $ 706 $ — $ — $ 706 $ 894 $ — $ — $ 894 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, 2022. 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, 2022 and December 31, 2021. There were no liabilities that are measured at fair value on a recurring basis as of June 30, 2022 and December 31, 2021. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis As of June 30, 2022 and December 31, 2021 the Company had no assets or liabilities required to be measured at fair value on a nonrecurring basis. Assets and Liabilities Not Measured at Fair Value

Balance sheet components

Balance sheet components	6 Months Ended
	Jun. 30, 2022
Balance Sheet Related Disclosures [Abstract]
Balance sheet components	Balance sheet components Accounts receivable, net Accounts receivable, net, consists of the following (in thousands): June 30, 2022 December 31, 2021 Accounts receivable $ 68,460 $ 55,324 Allowance for doubtful accounts — — $ 68,460 $ 55,324 Inventories Inventories consist of the following (in thousands): June 30, 2022 December 31, 2021 Raw materials $ 41,471 $ 32,809 Work in process 13,910 14,851 Finished goods (1) 10,129 5,236 $ 65,510 $ 52,896 ________________________________________________________ (1) Finished goods inventory at customer vendor managed inventory locations was $4.1 million and $1.8 million as of June 30, 2022 and December 31, 2021, respectively. Prepaid expenses and other current assets Prepaid expenses and other current assets consist of the following (in thousands): June 30, 2022 December 31, 2021 Prepaid taxes and taxes receivable $ 4,150 $ 5,825 Receivables due from suppliers 10,771 6,728 Deposits and other prepaid expenses 2,986 2,682 Other receivable 1,020 1,011 $ 18,927 $ 16,246 Purchased intangible assets, net Purchased intangible assets, net, consist of the following (in thousands): June 30, 2022 December 31, 2021 Gross Accumulated Net Gross Accumulated Net Technology and patents $ 37,189 $ (37,189) $ — $ 37,814 $ (37,814) $ — Customer relationships 15,110 (15,110) — 15,535 (15,535) — Leasehold interest 1,271 (484) 787 1,339 (495) 844 $ 53,570 $ (52,783) $ 787 $ 54,688 $ (53,844) $ 844 For the three months ended June 30, 2022 and 2021, amortization expense relating to technology and patents is included within cost of goods sold and totaled $0.0 million and $0.2 million in each period, respectively. For the six months ended June 30, 2022 and 2021, amortization expense relating to technology and patents is included within cost of goods sold and totaled $0.0 and $0.3 million in each period, respectively. The estimated future amortization expense of purchased intangible assets as of June 30, 2022, was as follows (in thousands): 2022 (remaining six months) $ 14 2023 29 2024 29 2025 29 2026 29 Thereafter 657 $ 787 Accrued and other current liabilities Accrued and other current liabilities consist of the following (in thousands): June 30, 2022 December 31, 2021 Employee-related $ 15,966 $ 14,956 Transition services agreement payable (refer to Note 11) — 823 Operating lease liabilities, current 2,456 2,356 Income and other taxes payable 4,024 2,703 Accrued warranty 670 977 Other accrued expenses 6,211 8,193 $ 29,327 $ 30,008 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 2022 2021 2022 2021 Beginning balance $ 966 $ 1,096 $ 977 $ 1,111 Warranty accruals 39 4 103 65 Settlements (335) (197) (410) (273) Ending balance $ 670 $ 903 $ 670 $ 903 Other noncurrent liabilities Other noncurrent liabilities consist of the following (in thousands): June 30, 2022 December 31, 2021 Pension and other employee-related $ 2,713 $ 3,266 Asset retirement obligations 3,535 3,508 Government grant 565 369 Other — 294 $ 6,813 $ 7,437

Restructuring Charges

Restructuring Charges	6 Months Ended
	Jun. 30, 2022
Restructuring and Related Activities [Abstract]
Restructuring Charges	Restructuring Charges A summary of the current period activity in accrued restructuring costs is as follows (in thousands): Employee Severance Other Total Restructuring obligations December 31, 2021 $ 302 $ — $ 302 Recoveries (18) — (18) Cash payments (284) — (284) Restructuring obligations June 30, 2022 $ — $ — $ — For the six months ended June 30, 2022, the restructuring recoveries related to accrual adjustments for severance and were included within cost of goods sold. In a second phase of restructuring actions taken in 2020, related to reducing operating expenses and manufacturing costs while maintaining the Company's focus on its core capabilities, in December 2021 the Company exercised its early exit right to terminate the facility lease in Fremont, California. As of June 30, 2022, the Company was in the process of completing final requirements for closure of the lease commitments.

Debt

Debt	6 Months Ended
	Jun. 30, 2022
Debt Disclosure [Abstract]
Debt	Debt The table below summarizes the carrying amounts and weighted average interest rates of the Company’s debt (in thousands, except percentages): June 30, 2022 December 31, 2021 Carrying Interest Carrying Interest Short-term borrowing: Note payable to Shanghai Pudong Development Bank $ — — % $ 15,000 0.60 % Unaccreted discount and issuance costs — (86) Short-term borrowing, net $ — $ 14,914 Long-term debt, current and noncurrent: Related party term loan with Lumentum Holdings Inc. $ 30,000 4.00 % $ — — % Borrowing under Wells Fargo Credit Facility 20,571 3.12 % 20,338 1.94 % Mitsubishi Bank loans 3,438 1.06%-1.46% 5,000 1.06%-1.46% Mitsubishi Bank and Yamanashi Chuo Bank loan 2,454 1.07 % 3,429 1.06 % Finance lease liability 43 94 Total long-term debt 56,506 28,861 Unaccreted discount and issuance costs (158) (180) Total long-term debt, net of unaccreted discount and issuance costs $ 56,348 $ 28,681 Reported as: Current portion of long-term debt $ 2,449 $ 2,928 Long-term debt, net of current portion 23,945 25,753 Related party long-term debt 29,954 — Total long-term debt, net of unaccreted discount and issuance costs $ 56,348 $ 28,681 Notes payable and short-term borrowing In June 2021, NeoPhotonics (China) Co., Ltd., ("NeoPhotonics China"), a subsidiary of the Company, entered into a credit line agreement with Shanghai Pudong Development Bank Shenzhen Branch (“SPDB”) providing for a line of credit to NeoPhotonics China in an amount of RMB 120,000,000 (approximately $17.9 million) for short-term loans at varying interest rates. The line of credit facility expired on February 23, 2022. In June 2021, NeoPhotonics Dongguan Co., Ltd (“NeoPhotonics Dongguan”), also a subsidiary of the Company, entered into a credit line agreement with SPDB providing for a line of credit to NeoPhotonics Dongguan in an amount of RMB 30,000,000 (approximately $4.5 million) for short-term loans at varying interest rates. As of June 30, 2022, there was not an amount outstanding under this credit facility. The line of credit facility expired on February 23, 2022. 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 As of June 30, 2022 and December 31, 2021, there was $0 and $15 million outstanding under the NeoPhotonics China credit facility, respectively. The note payable bore interest at 3.0% (2.4% of which was charged to NeoPhotonics China as a loan fee and paid in the fourth quarter of 2021) and was repaid in March 2022. There was no amount outstanding under the NeoPhotonics Dongguan line of credit as of June 30, 2022 and December 31, 2021. As of June 30, 2022 and December 31, 2021, there were no bank acceptance drafts issued in connection under the NeoPhotonics China and the NeoPhotonics Dongguan credit facility. There were no compensating balances relating to these credit facilities as of June 30, 2022 and December 31, 2021, respectively. Compensating balances are classified as restricted cash on the Company’s condensed consolidated balance sheets. Credit facilities In June 2021, the Company entered into an Amended and Restated Credit Agreement (the “A&R Credit Agreement”) with Wells Fargo Bank, National Association ("Wells Fargo"), as administrative agent for a lender group. The A&R Credit Agreement amends and restates in full that certain Credit Agreement dated as of September 8, 2017 (as amended, the "Former Credit Agreement"), by and among the Company and Wells Fargo. The A&R Credit Agreement provides for continuation of the $50 million revolving credit facility (the "Credit Facility"). The A&R Credit Agreement provides for borrowings equal to the lower of (a) a maximum revolver amount of $50.0 million, or (b) an amount up to 80% - 90% of eligible accounts receivable plus 100% of qualified cash balances up to $15.0 million, less certain discretionary adjustments ("Borrowing Base"). The maximum revolver amount may be increased by up to $25.0 million, subject to certain conditions. The A&R Credit Agreement matures on June 30, 2026 and borrowings bear interest, at the Company's option, at an interest rate of either (a) the LIBOR rate, plus an applicable margin ranging from 1.50% to 1.75% per annum, based upon the average excess availability (as defined in the Credit Facility), or (b) the prime lending rate, plus an applicable margin ranging from 0.50% to 0.75% per annum, based upon the average excess availability. The Company is also required to pay a commitment fee equal to 0.25% of the unused portion of the Credit Facility, monthly, in arrears. The A&R Credit Agreement requires a mandatory prepayment of the borrowings to the extent the outstanding balance is greater than the lesser of (a) the most recently calculated Borrowing Base, or (b) the maximum revolver amount. The Company was required to maintain a combination of certain defined cash balances and unused borrowing capacity under the A&R Credit Agreement of at least $20.0 million, of which at least $5.0 million shall include unused borrowing capacity. As a result of the delayed draw term loan with Lumentum, the defined cash balances and unused borrowing capacity under the A&R Credit Agreement has changed to $30.0 million, of which at least $6.25 million shall include unused borrowing capacity. The Agreement also restricts the Company's ability to dispose of assets, to permit change in control, merge or consolidate, make acquisitions, incur indebtedness, grant liens, make investments and make certain restricted payments. Borrowings under the Credit Facility are collateralized by substantially all of the Company's assets. The Company was in compliance with the covenants of the A&R Credit Agreement as of June 30, 2022 and December 31, 2021. As of June 30, 2022, the outstanding balance under the A&R Credit Agreement was $20.6 million and the weighted average rate under the LIBOR option was 3.12%. The remaining borrowing capacity as of June 30, 2022 was $15.4 million. During the three months ended June 30, 2022, $0.1 million of accrued interest was included as a component of the principal amount of the Wells Fargo Credit Facility. On November 3, 2021, the Company entered into the Merger Agreement, with Lumentum and Neptune Merger Sub, Inc., a wholly owned subsidiary of Lumentum. In connection with the Merger with Lumentum "Related Party", a subordinated unsecured delayed draw term loan facility was agreed to on January 14, 2022. Lumentum will provide up to $50 million in interim debt financing to the Company, which would provide financing that may be necessary to operate the Company's business during the pendency of the Merger on terms that are, taken as a whole, likely better than those that could otherwise be obtained from an unrelated third party. As of June 30, 2022, the Company had drawn $30 million from the facility. The loan has a two-year term and bears interest at the prime rate. The Lumentum credit facility is subordinated to the existing Wells Fargo Facility in right of payment and otherwise pursuant to a subordination agreement entered into between Wells, the Company and Lumentum. The Lumentum credit facility is available to the Company commencing on the closing date of the Lumentum credit facility ("Credit Facility Closing Date") or such later date as agreed to by Lumentum and the Company until the earlier of (a) the date the Merger Agreement is terminated for any reason without the closing of the Merger or (b) the Closing Date of the merger. The Lumentum credit facility has a financial covenant whereby the Company agrees that, until the termination of all of the commitments and the payment in full of the obligations, the Company will not permit liquidity to be less than (i) $20.0 million at all times prior to the Initial Advance, or (ii) $30.0 million at all times after the Initial Advance a change from the $20.0 million stated in the A&R Credit Agreement. The minimum unused borrowing capacity was increased from $5.0 million as stated in the A&R Credit Agreement to $6.25 million. The Company was in compliance with all covenants as of June 30, 2022. The Company is subject to a number of affirmative and restrictive covenants pursuant to the credit agreement, including minimum liquidity, compliance with applicable laws and regulations, payment of taxes, maintenance of insurance, business combinations, occurrence of additional indebtedness, prepayments of other indebtedness and transactions with affiliates, among other covenants. As part of the Credit Facility, there are certain clauses where if triggered, the loan would become payable immediately. The Loan Agreement states that the loan, together with all accrued and unpaid interest thereon, shall become due and payable on the date noted and upon the trigger of the following contingencies: (a) if the Merger Agreement is terminated by either Lumentum or the Company, the Parent Termination Fee as defined in the Merger Agreement ($55.1 million) is payable on the date of the termination of the Merger Agreement (the "Merger Termination Date"), (b) if the Merger Agreement is terminated by Lumentum and a new buyer assumes all the rights and obligations of Lumentum, the date that is two years after the Credit Facility Closing Date, (c) if the Merger Agreement is terminated by the Company and the new buyer does not assume all the rights and obligations of Lumentum, the Merger Termination Date, (d) if the Merger Agreement is terminated and no Parent Termination Fee is payable, the date that is two years after the Credit Facility Closing Date. Mitsubishi Bank loans On February 25, 2015, the Company entered into certain loan agreements and related agreements with MUFG Bank, Ltd. (the “Mitsubishi Bank”) that provided for (i) a term loan in the aggregate principal amount of 500.0 million JPY ($4.4 million) (the “Term Loan A”) and (ii) a term loan in the aggregate principal amount of one billion JPY (approximately $7.3 million) (the “Term Loan B” and together with the Term Loan A, the “2015 Mitsubishi Bank Loans”). The 2015 Mitsubishi Bank Loans are secured by a mortgage on certain real property and buildings owned by the Company’s Japanese subsidiary. Interest on the 2015 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 required 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 8.3 million JPY (approximately $0.1 million) until the maturity date of February 25, 2025, with a lump sum payment of the balance of 8.4 million JPY (approximately $0.1 million) 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 40.5 million JPY (approximately $0.4 million). The Term Loan A of 500.0 million JPY (approximately $4.4 million) was repaid to the Mitsubishi Bank in January 2018. The 2015 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 2015 Mitsubishi Bank Loans contain financial covenants relating to minimum net assets, maximum ordinary loss and a coverage ratio covenant. The Company was in compliance with the related covenants as of June 30, 2022 and December 31, 2021. Outstanding principal balance for the Mitsubishi Term Loans was 266.7 million JPY (approximately $2.0 million) as of June 30, 2022. In March 2017, the Company entered into a loan agreement and related agreements with the Mitsubishi Bank for a term loan of 690.0 million JPY (approximately $5.1 million) (the “2017 Mitsubishi Bank Loan”) to acquire manufacturing equipment for its Japanese subsidiary. This loan is secured by the manufacturing equipment owned by the Company's subsidiary in Japan. 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 coverage ratio covenant. The Company was in compliance with these covenants as of June 30, 2022 and December 31, 2021. The loan was available from March 31, 2017 to March 30, 2018 and 690.0 million JPY (approximately $5.1 million) under this loan was fully drawn in March 2017. Outstanding principal balance for the 2017 Mitsubishi Bank Loan was approximately 201.3 million JPY (approximately $1.5 million) as of June 30, 2022. Mitsubishi Bank and Yamanashi Chuo Bank loan In January 2018, the Company entered into a term loan agreement with Mitsubishi Bank and The Yamanashi Chuo Bank, Ltd. for a term loan in the aggregate principal amount of 850.0 million JPY (approximately $6.2 million) (the “Term Loan C”). The purpose of the Term Loan C is to obtain machinery for the core parts of the manufacturing line and payments for related expenses by the Company's subsidiary in Japan. The Term Loan C requires no additional security. The Term Loan C was available from January 29, 2018 to January 29, 2025. The full amount of the Term Loan C was drawn in January 2018. Interest on the Term Loan C is based upon the annual rate of the three months TIBOR rate plus 1.00%. The Term Loan C requires quarterly interest payments, along with the principal payments, over 82 months commencing in April 2018. The Term Loan C loan agreement contains customary representations and warranties and customary affirmative and negative covenants applicable to the Japanese Subsidiary, including, among other things, restrictions on cessation in business, management, mergers or acquisitions. The Term Loan C loan agreement contains financial covenants relating to minimum net assets and maximum ordinary loss. The Company was in compliance with these covenants as of June 30, 2022 and December 31, 2021. Outstanding principal balance for the Mitsubishi Bank and Yamanashi Chuo Bank Loan was approximately 333.9 million JPY (approximately $2.5 million) as of June 30, 2022. As of June 30, 2022, maturities of long-term borrowings are as follows (in thousands): 2022 (remaining six months) $ 1,279 2023 2,472 2024 31,838 2025 346 2026 20,571 $ 56,506

Leases

Leases	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Leases	Leases The Company has operating leases for offices, research and development facilities and manufacturing facilities. Leases have remaining terms of two years to six years, some of which include options to extend the leases and some of which may include options to terminate the leases within one year. As of June 30, 2022 and December 31, 2021, an asset recorded in property, plant and equipment under a finance lease was immaterial. The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Operating lease cost $ 754 $ 782 $ 1,512 $ 1,556 Variable and short-term lease cost 628 671 1,306 1,300 Total lease cost $ 1,382 $ 1,453 $ 2,818 $ 2,856 Other information related to leases was as follows (in thousands, except lease term and discount rate): Six Months Ended 2022 2021 Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,670 $ 1,680 Weighted average remaining lease term Operating leases 5.0 years 5.9 years Weighted average discount rate Operating leases 6.3 % 6.3 % Future minimum lease payments under non-cancelable leases as of June 30, 2022 were as follows (in thousands): Operating Leases 2022 (remaining six months) $ 1,632 2023 3,350 2024 3,331 2025 3,407 2026 3,273 Thereafter 2,128 Total future minimum lease payments 17,121 Less imputed interest (2,558) Total $ 14,563 As of June 30, 2022 and December 31, 2021, the future minimum lease payments are captured in the Company's Consolidated Balance Sheets as follows: Operating leases: June 30, 2022 December 31, 2021 Accrued and other current liabilities $ 2,456 $ 2,356 Operating lease liabilities, noncurrent 12,107 13,441 Total $ 14,563 $ 15,797

Japan pension plan

Japan pension plan	6 Months Ended
	Jun. 30, 2022
Retirement Benefits [Abstract]
Japan pension plan	Japan pension plan The pension liability related to the Company’s Retirement Allowance Plan (“RAP”) in Japan as of June 30, 2022 was $2.2 million, of which $0.2 million was recorded in accrued and other current liabilities and the remainder in other noncurrent liabilities on the Company’s condensed consolidated balance sheet. The pension liability related to RAP in Japan as of December 31, 2021 was $2.7 million, of which $0.3 million, 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, 2022 and 2021.

Commitments and contingencies

Commitments and contingencies	6 Months Ended
	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	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), except for the matter discussed in the following paragraph, 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. Finisar Litigation In January 2010, Finisar Corporation (acquired by II-VI, Inc. in September 2019) ("Finisar"), filed a complaint in the U.S. District Court for the Northern District of California, 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 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 estimate a range of possible loss, if any. APAT Litigation and Settlement Starting in April 2018, APAT OE and NeoPhotonics (China) Co., Ltd. and NeoPhotonics Dongguan Co. Ltd. (collectively "NeoChina", which are both wholly-owned subsidiaries of the Company) and NeoPhotonics Corporation were involved in a series of litigations and arbitrations which arose out of the 2017 sale by NeoChina of certain low speed transceiver assets to APAT. On October 27, 2020, the parties entered into a settlement agreement to settle all claims and release all property preservation orders. In accordance with the settlement agreement, all payments between the parties have been made, with the final payment made in the first quarter of 2022. At June 30, 2022 and December 31, 2021, the amount payable by the Company to APAT OE under the settlement agreement was $0 and approximately $0.8 million, respectively, and is included in Accrued and other current liabilities in the caption "Transition services agreement payable" (See Note 6). APAT OE has repaid the full amount of the Transition Services Agreement Receivable owed to the Company and there is currently no balance remaining as of June 30, 2022 (See Note 6). Indemnifications In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties and provides 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.

Stockholders' equity

Stockholders' equity	6 Months Ended
	Jun. 30, 2022
Stockholders' Equity Note [Abstract]
Stockholders’ equity	Stockholders’ equity Common Stock As of June 30, 2022, the Company had reserved 5,821,355 common stock for issuance under its equity incentive plans. Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive income (loss), net of related taxes, were as follows (in thousands): Foreign Currency Translation Adjustments Defined Benefit Pension Plan Adjustment Total Accumulated Other Comprehensive Income (Loss) Balances as of December 31, 2021 $ 2,603 $ (227) $ 2,376 Other comprehensive loss, net of taxes of zero (11,158) — (11,158) Balances at June 30, 2022 $ (8,555) $ (227) $ (8,782) No material amounts were reclassified out of accumulated other comprehensive income (loss) during the three and six months ended June 30, 2022 and 2021 for realized gains or losses on available-for-sale securities. Accumulated Deficit Approximately $10.5 million of the Company’s retained earnings within its total accumulated deficit as of December 31, 2021 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.

Restricted net assets

Restricted net assets	6 Months Ended
	Jun. 30, 2022
Restricted Net Assets [Abstract]
Restricted net assets	Restricted net assets The Company’s consolidated subsidiaries operating in China and Japan are restricted from transferring funds or assets to its parent company in the form of cash dividends, loans or advances. As of June 30, 2022 and December 31, 2021, the Company's consolidated subsidiaries had $10.7 million and $11.4 million, respectively, of restricted net assets. This compares to the Company's consolidated net assets of $152.3 million and $153.0 million as of June 30, 2022 and December 31, 2021, respectively, which consisted of (in thousands): June 30, 2022 December 31, 2021 Cash restricted in China due to unpaid employee benefits and unfulfilled government grants $ — $ 49 China earnings restricted to fund statutory common reserves in China 9,938 10,463 Loan agreements in Japan requiring local subsidiaries to maintain minimum net asset levels 735 869 Total restricted net assets in the Company's consolidated subsidiaries $ 10,673 $ 11,381

Stock-based compensation

Stock-based compensation	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation	Stock-based compensation The following table summarizes the stock-based compensation expense recognized in the three and six months ended June 30, 2022 and 2021 (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Cost of goods sold $ 404 $ 572 $ 929 $ 1,120 Research and development 794 744 1,568 1,606 Sales and marketing 400 261 785 815 General and administrative 1,011 763 1,942 2,076 $ 2,609 $ 2,340 $ 5,224 $ 5,617 As of June 30, 2022 and December 31, 2021, stock-based compensation capitalized in inventories totaled $0.3 million and $0.4 million, respectively. Determining Fair Value The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model. Stock Options and Restricted Stock Units (RSUs) The following table summarizes the Company’s stock option and RSU activity, excluding market and performance-based RSUs, during the six months ended June 30, 2022: Stock Options Restricted Stock Units Number of Number of Balance as of December 31, 2021 1,279,222 3,387,315 Granted — 72,730 Exercised/Converted (114,155) (420,222) Cancelled/Forfeited (1,500) (69,387) Balances at June 30, 2022 1,163,567 2,970,436 At June 30, 2022, the Company had $0.0 million of unrecognized stock-based compensation expense for stock options, net of estimated forfeitures. At June 30, 2022, the Company had $16.7 million of unrecognized stock-based compensation expense for RSUs, excluding market and performance-based RSUs, net of estimated forfeitures. Market-based Restricted Stock Units As of June 30, 2022, the Company has granted 705,000 shares of market-based RSUs and 132,625 shares remain outstanding to certain employees. These RSUs vest if the 30-day weighted average closing price of the Company's common stock is equal to or greater than certain price targets per share and the recipients remain in continuous service with the Company through such service period. A total of 438,375 market-based RSUs have vested and 134,000 market-based RSUs have been cancelled/forfeited through June 30, 2022. As of June 30, 2022, the Company had $0.0 million of unrecognized stock-based compensation expense for these RSUs, net of estimated forfeitures. The fair value of market-based RSUs was measured on the grant date using Monte Carlo simulation model with the following assumptions: Assumptions Weighted-average volatility 66% Risk-free interest rate 2.79% Expected dividends 0% Performance-based Restricted Stock Units In April 2020, the Company granted 90,400 shares of performance-based RSUs to certain employees. These RSUs will vest upon certification by the Board of Directors or the Compensation Committee that the Company has achieved at least $425 million in revenue over four consecutive fiscal quarters and the recipients remain in continuous service with the Company through such service period. None of these performance-based RSUs were vested and 14,950 of these performance-based RSUs had been cancelled/forfeited through June 30, 2022. In July 2021, the Company granted 165,000 shares of performance-based RSUs to certain employees. These RSUs will vest upon certification by the Board of Directors or the Compensation Committee that the Company has achieved at least $100 million in revenue from Data Center Customers as measured over four consecutive quarters and the recipients remain in continuous service with the Company through such service period. None of these performance-based RSUs were vested nor have any been cancelled/forfeited through June 30, 2022. Stock Appreciation Units (SAUs) SAUs are liability classified share-based awards. Outstanding SAUs are re-measured each reporting period at fair value until settlement. The Company did not grant any SAUs during the three and six months ended June 30, 2022 or 2021. As of June 30, 2022 and December 31, 2021, there were 25,000 and 25,000 SAUs outstanding, respectively, and related SAU liabilities were $0.3 million and $0.3 million, respectively. Employee Stock Purchase Plan (ESPP) As a condition of the Merger Agreement with Lumentum, effective November 16, 2021, the ESPP program was terminated by the Company and therefore there is no unrecognized compensation expense for employee stock purchase rights for any periods after that date. 2020 Equity Incentive Plan On June 1, 2021, at the 2021 Annual Meeting of Stockholders of NeoPhotonics Corporation, the Company's stockholders approved NeoPhotonics Corporation 2020 Equity Incentive Plan as amended and restated (the “Amended 2020 Plan”) to increase the number of shares available for the grant of stock options, restricted stock unit awards, and other awards by 900,000 shares. The Amended 2020 Plan became effective immediately upon stockholder approval at the Annual Meeting. After taking this amendment into account, the aggregate number of shares of common stock reserved for issuance under the Amended 2020 Plan will not exceed the sum of (i) 2,821,414 shares and (ii) certain shares subject to outstanding awards granted under the Company’s 2010 Equity Incentive Plan or 2011 Inducement Award Plan that may become available for issuance under the Amended 2020 Plan, as such shares become available from time to time.

Income taxes

Income taxes	6 Months Ended
	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Income taxes	Income taxes The income tax provision in the periods presented is as follows (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Income tax provision $ (2,521) $ (192) $ (3,093) $ (823) The Company’s income tax provision in the three and six months ended June 30, 2022 and 2021 was primarily related to income taxes on earnings from its foreign tax jurisdictions. 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. Due to historical 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, 2022, 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, 2021.

The Company, basis of present_2

The Company, basis of presentation and significant accounting policies (Policies)	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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, 2022 and for the three and six months ended June 30, 2022 and 2021, 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. These condensed consolidated financial statements do not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”) and 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, 2021. The results of operations for the three and six months ended June 30, 2022 are not necessarily indicative of the results expected for the entire fiscal year. All intercompany accounts and transactions have been eliminated.
Certain Significant Risks and Uncertainties	Certain Significant Risks and UncertaintiesThe 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 and inflation levels; the highly cyclical nature of the industries the Company serves; successful and timely completion of product design efforts; the ability of the Company to sell its new products into new market segments; trade restrictions by the United States against the Company's customers in China, as well as potential retaliatory trade actions taken by China; the loss of any of its larger customers; restrictions on the Company's ability to sell to foreign customers due to additional U.S. or new China trade laws, regulations and requirements; disruptions of the supply chain of components needed for its products; 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; and new product design introductions by competitors. The inputs into the Company’s judgments and estimates consider the economic implications of the Covid-19 pandemic and supply chain implications as the Company knows them, on its critical and significant accounting estimates. The extent to which the Covid-19 pandemic may impact its business will depend on future developments, which are highly uncertain, such as the duration of the outbreak, travel restrictions, governmental mandates issued to mitigate the spread of the disease, business closures, economic disruptions, and the effectiveness of actions taken to contain and treat the virus. Accordingly, future adverse developments with respect to the Covid-19 pandemic, persistent inflation and economic uncertainty and the impacts of semiconductor supply shortages may have a negative impact on its results of operations.
Concentration	Concentration In the three months ended June 30, 2022, three customers were each greater than 10% of the Company’s total revenue, representing 71% of total revenue, and the Company's top five customers represented approximately 83% of the Company’s total revenue. In the three months ended June 30, 2021, three customers each were greater than 10% of revenue, representing 61% of total revenue, and the Company's top five customers during this period represented 77% of total revenue. In the six months ended June 30, 2022, three customers were each greater than 10% of the Company’s total revenue, representing 69% of total revenue, and the Company's top five customers represented approximately 81% of the Company’s total revenue. In the six months ended June 30, 2021, four customers each were greater than 10% of revenue, representing 66% of total revenue, and the Company's top five customers during this period represented 76% of total revenue.
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 and recoverability of long-lived assets; valuation allowances for deferred tax assets; valuation of excess and obsolete inventories; warranty reserves; and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
Long-lived Assets	Long-lived AssetsThe Company assesses the impairment of long-lived assets whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss would be recognized when the sum of the future net cash flows expected to result from the use of the asset and its eventual disposition is less than its carrying amount. The estimated future cash flows are based upon, among other things, assumptions about expected future operating performance and may differ from actual cash flows.
Leases	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use ("ROU") assets, other current liabilities and operating lease liabilities on the Company's condensed consolidated balance sheets. Finance leases are included in property, plant and equipment, current portion of long-term debt and long-term debt, net of current portion on the condensed consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company's leases do not provide an implicit rate, the Company uses an estimate of its incremental borrowing rate based on observed market data and other information available at the lease commencement date. The operating lease ROU assets also include any lease payments made and exclude lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. The Company does not record leases on the condensed consolidated balance sheet with a term of one year or less. The Company does not separate lease and non-lease components but rather account for each separate component as a single lease component for all underlying classes of assets. Variable lease payments are expensed as incurred and are not included within the operating lease ROU asset and lease liability calculation. Variable lease payments primarily include reimbursements of costs incurred by lessors for common area maintenance and utilities. Lease expense for minimum operating lease payments is recognized on a straight-line basis over the lease term.
Accounting Pronouncements Recently Adopted/Recent Accounting Pronouncements Not Yet Effective	Accounting Pronouncements Recently Adopted In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which simplifies the accounting for income taxes. This guidance became effective for fiscal years beginning after December 15, 2020. The Company adopted this ASU in the first quarter of 2021 and the adoption of this standard did not have a material impact on the Company's consolidated financial statements. Recent Accounting Pronouncements Not Yet Effective 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. In November 2019, the FASB issued ASU 2019-10, according to which, the new standard is effective for smaller reporting companies (“SRC”) as defined by the SEC, for fiscal years beginning after December 15, 2022 including interim periods within those fiscal years. The Company is in the process of evaluating the impact and timing of the adoption on its consolidated financial statements and related disclosures.
Revenue	Product revenue The Company develops, manufactures and sells lasers and other high-speed optoelectronic products that transmit, receive, modify and switch high-speed digital optical signals for communications networks. Revenue is derived primarily from the sale of optoelectronic laser, component and module hardware products. The Company sells its products worldwide, primarily to leading network equipment manufacturers. Revenue recognition Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. The Company generally bears all costs, risk of loss or damage and retains title to the goods up to the point of transfer of control of promised products to customer. Revenue related to the sale of consignment inventories at customer vendor managed locations is not recognized until the products are pulled from consignment inventories by customers. In instances where acceptance of the product or solutions is specified by the customer, revenue is deferred until such required acceptance criteria have been met. Shipping and handling costs are included in the cost of goods sold. The Company presents revenue net of sales taxes and any similar assessments. The Company’s performance obligations relate to contracts with a duration of less than one year. The Company elected to apply the practical expedient provided in Accounting Standard Codification Topic 606, “Revenue from Contracts with Customers” and, therefore, is not required to disclose the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. Nature of products

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Schedule of Revenue by Product Group and Geographical Region	The following presents revenue by product group (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 High Speed Products $ 88,999 $ 61,032 $ 172,580 $ 118,305 Network Products and Solutions 6,007 3,978 11,694 7,630 Total revenue $ 95,006 $ 65,010 $ 184,274 $ 125,935 The following table presents the Company's revenue information by geographical region. Revenue is classified based on the ship to location requested by the customer. Such classification recognizes that for many customers, including those in North America or in Europe, designated shipping points are often in China or elsewhere in Asia (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 China $ 16,389 $ 24,940 $ 36,417 $ 40,183 Americas 12,959 5,997 26,654 11,188 Rest of world 65,658 34,073 121,203 74,564 Total revenue $ 95,006 $ 65,010 $ 184,274 $ 125,935

Net income (loss) per share (Ta

Net income (loss) per share (Tables)	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted 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 2022 2021 2022 2021 Numerator: Net income (loss) $ 9,305 $ (17,433) $ 6,002 $ (28,124) Denominator: Weighted average shares used to compute per share amount: Basic 53,488 51,634 53,318 51,178 Diluted 56,095 51,634 55,999 51,178 Basic net income (loss) per share $ 0.17 $ (0.34) $ 0.11 $ (0.55) Diluted net income (loss) per share $ 0.17 $ (0.34) $ 0.11 $ (0.55)
Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Income (Loss) per Share Attributable to Common Stockholders	The Company has excluded the impact of the following outstanding employee stock options and restricted stock units as well as the shares that were 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 2022 2021 2022 2021 Employee stock options 5 1,734 5 1,734 Restricted stock units 1 2,465 1 2,465 Market-based restricted stock units — 265 — 265 Performance-based restricted stock units 240 75 240 75 Employee stock purchase plan — 132 — 132 246 4,671 246 4,671

Cash, cash equivalents, short_2

Cash, cash equivalents, short-term investments, and restricted cash (Tables)	6 Months Ended
	Jun. 30, 2022
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	The following table summarizes the Company’s cash, cash equivalents and restricted cash (in thousands): June 30, 2022 December 31, 2021 Cash and cash equivalents $ 77,079 $ 77,833 Restricted cash 38 87 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 77,117 $ 77,920
Schedule of Restricted Cash	The following table summarizes the Company’s cash, cash equivalents and restricted cash (in thousands): June 30, 2022 December 31, 2021 Cash and cash equivalents $ 77,079 $ 77,833 Restricted cash 38 87 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 77,117 $ 77,920 June 30, 2022 December 31, 2021 Cash restricted in China due to unpaid employee benefits and unfulfilled government grants $ — $ 49 China earnings restricted to fund statutory common reserves in China 9,938 10,463 Loan agreements in Japan requiring local subsidiaries to maintain minimum net asset levels 735 869 Total restricted net assets in the Company's consolidated subsidiaries $ 10,673 $ 11,381
Schedule of Unrealized Gains and Losses Related to Cash Equivalents and Investments in Marketable Securities	The following table summarizes the Company’s unrealized gains and losses related to its short-term investments in marketable securities designated as available-for-sale (in thousands): As of June 30, 2022 As of December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Marketable securities: Money market funds $ 27,720 $ — $ — $ 27,720 $ 27,675 $ — $ — $ 27,675 Reported as: Short-term investments $ 27,720 $ 27,675

Fair value disclosures (Tables)

Fair value disclosures (Tables)	6 Months Ended
	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Schedule of 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, 2022 As of December 31, 2021 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Short-term investments: Money market funds $ 27,720 $ — $ — $ 27,720 $ 27,675 $ — $ — $ 27,675 Other long-term assets: Mutual funds held in Rabbi Trust $ 706 $ — $ — $ 706 $ 894 $ — $ — $ 894

Balance sheet components (Table

Balance sheet components (Tables)	6 Months Ended
	Jun. 30, 2022
Balance Sheet Related Disclosures [Abstract]
Schedule of accounts receivable, net	Accounts receivable, net, consists of the following (in thousands): June 30, 2022 December 31, 2021 Accounts receivable $ 68,460 $ 55,324 Allowance for doubtful accounts — — $ 68,460 $ 55,324
Schedule of inventories, net	Inventories consist of the following (in thousands): June 30, 2022 December 31, 2021 Raw materials $ 41,471 $ 32,809 Work in process 13,910 14,851 Finished goods (1) 10,129 5,236 $ 65,510 $ 52,896 ________________________________________________________ (1) Finished goods inventory at customer vendor managed inventory locations was $4.1 million and $1.8 million as of June 30, 2022 and December 31, 2021, respectively.
Schedule of prepaid expenses and other current assets	Prepaid expenses and other current assets consist of the following (in thousands): June 30, 2022 December 31, 2021 Prepaid taxes and taxes receivable $ 4,150 $ 5,825 Receivables due from suppliers 10,771 6,728 Deposits and other prepaid expenses 2,986 2,682 Other receivable 1,020 1,011 $ 18,927 $ 16,246
Schedule of purchased intangible assets	Purchased intangible assets, net, consist of the following (in thousands): June 30, 2022 December 31, 2021 Gross Accumulated Net Gross Accumulated Net Technology and patents $ 37,189 $ (37,189) $ — $ 37,814 $ (37,814) $ — Customer relationships 15,110 (15,110) — 15,535 (15,535) — Leasehold interest 1,271 (484) 787 1,339 (495) 844 $ 53,570 $ (52,783) $ 787 $ 54,688 $ (53,844) $ 844
Schedule of estimated future amortization expense of purchased intangible assets	The estimated future amortization expense of purchased intangible assets as of June 30, 2022, was as follows (in thousands): 2022 (remaining six months) $ 14 2023 29 2024 29 2025 29 2026 29 Thereafter 657 $ 787
Schedule of accrued and other current liabilities	Accrued and other current liabilities consist of the following (in thousands): June 30, 2022 December 31, 2021 Employee-related $ 15,966 $ 14,956 Transition services agreement payable (refer to Note 11) — 823 Operating lease liabilities, current 2,456 2,356 Income and other taxes payable 4,024 2,703 Accrued warranty 670 977 Other accrued expenses 6,211 8,193 $ 29,327 $ 30,008
Schedule of 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 2022 2021 2022 2021 Beginning balance $ 966 $ 1,096 $ 977 $ 1,111 Warranty accruals 39 4 103 65 Settlements (335) (197) (410) (273) Ending balance $ 670 $ 903 $ 670 $ 903
Schedule of other noncurrent liabilities	Other noncurrent liabilities consist of the following (in thousands): June 30, 2022 December 31, 2021 Pension and other employee-related $ 2,713 $ 3,266 Asset retirement obligations 3,535 3,508 Government grant 565 369 Other — 294 $ 6,813 $ 7,437

Restructuring Charges (Tables)

Restructuring Charges (Tables)	6 Months Ended
	Jun. 30, 2022
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve Costs	A summary of the current period activity in accrued restructuring costs is as follows (in thousands): Employee Severance Other Total Restructuring obligations December 31, 2021 $ 302 $ — $ 302 Recoveries (18) — (18) Cash payments (284) — (284) Restructuring obligations June 30, 2022 $ — $ — $ —

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2022
Debt Disclosure [Abstract]
Schedule of Carrying Amounts and Weighted Average Interest Rate	The table below summarizes the carrying amounts and weighted average interest rates of the Company’s debt (in thousands, except percentages): June 30, 2022 December 31, 2021 Carrying Interest Carrying Interest Short-term borrowing: Note payable to Shanghai Pudong Development Bank $ — — % $ 15,000 0.60 % Unaccreted discount and issuance costs — (86) Short-term borrowing, net $ — $ 14,914 Long-term debt, current and noncurrent: Related party term loan with Lumentum Holdings Inc. $ 30,000 4.00 % $ — — % Borrowing under Wells Fargo Credit Facility 20,571 3.12 % 20,338 1.94 % Mitsubishi Bank loans 3,438 1.06%-1.46% 5,000 1.06%-1.46% Mitsubishi Bank and Yamanashi Chuo Bank loan 2,454 1.07 % 3,429 1.06 % Finance lease liability 43 94 Total long-term debt 56,506 28,861 Unaccreted discount and issuance costs (158) (180) Total long-term debt, net of unaccreted discount and issuance costs $ 56,348 $ 28,681 Reported as: Current portion of long-term debt $ 2,449 $ 2,928 Long-term debt, net of current portion 23,945 25,753 Related party long-term debt 29,954 — Total long-term debt, net of unaccreted discount and issuance costs $ 56,348 $ 28,681
Schedule of Maturities of Notes Payable and Long-term Borrowings	As of June 30, 2022, maturities of long-term borrowings are as follows (in thousands): 2022 (remaining six months) $ 1,279 2023 2,472 2024 31,838 2025 346 2026 20,571 $ 56,506

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2022
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Operating lease cost $ 754 $ 782 $ 1,512 $ 1,556 Variable and short-term lease cost 628 671 1,306 1,300 Total lease cost $ 1,382 $ 1,453 $ 2,818 $ 2,856 Other information related to leases was as follows (in thousands, except lease term and discount rate): Six Months Ended 2022 2021 Supplemental cash flow information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,670 $ 1,680 Weighted average remaining lease term Operating leases 5.0 years 5.9 years Weighted average discount rate Operating leases 6.3 % 6.3 %
Schedule Of Future Minimum Lease Payments Under Non-Cancellable Leases	Future minimum lease payments under non-cancelable leases as of June 30, 2022 were as follows (in thousands): Operating Leases 2022 (remaining six months) $ 1,632 2023 3,350 2024 3,331 2025 3,407 2026 3,273 Thereafter 2,128 Total future minimum lease payments 17,121 Less imputed interest (2,558) Total $ 14,563
Schedule Of Operating Leases	As of June 30, 2022 and December 31, 2021, the future minimum lease payments are captured in the Company's Consolidated Balance Sheets as follows: Operating leases: June 30, 2022 December 31, 2021 Accrued and other current liabilities $ 2,456 $ 2,356 Operating lease liabilities, noncurrent 12,107 13,441 Total $ 14,563 $ 15,797

Stockholders' equity (Tables)

Stockholders' equity (Tables)	6 Months Ended
	Jun. 30, 2022
Stockholders' Equity Note [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Related Taxes	The components of accumulated other comprehensive income (loss), net of related taxes, were as follows (in thousands): Foreign Currency Translation Adjustments Defined Benefit Pension Plan Adjustment Total Accumulated Other Comprehensive Income (Loss) Balances as of December 31, 2021 $ 2,603 $ (227) $ 2,376 Other comprehensive loss, net of taxes of zero (11,158) — (11,158) Balances at June 30, 2022 $ (8,555) $ (227) $ (8,782)

Restricted net assets (Tables)

Restricted net assets (Tables)	6 Months Ended
	Jun. 30, 2022
Restricted Net Assets [Abstract]
Schedule of Restricted Cash	The following table summarizes the Company’s cash, cash equivalents and restricted cash (in thousands): June 30, 2022 December 31, 2021 Cash and cash equivalents $ 77,079 $ 77,833 Restricted cash 38 87 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 77,117 $ 77,920 June 30, 2022 December 31, 2021 Cash restricted in China due to unpaid employee benefits and unfulfilled government grants $ — $ 49 China earnings restricted to fund statutory common reserves in China 9,938 10,463 Loan agreements in Japan requiring local subsidiaries to maintain minimum net asset levels 735 869 Total restricted net assets in the Company's consolidated subsidiaries $ 10,673 $ 11,381

Stock-based compensation (Table

Stock-based compensation (Tables)	6 Months Ended
	Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]
Schedule of Stock Based Compensation Expense	The following table summarizes the stock-based compensation expense recognized in the three and six months ended June 30, 2022 and 2021 (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Cost of goods sold $ 404 $ 572 $ 929 $ 1,120 Research and development 794 744 1,568 1,606 Sales and marketing 400 261 785 815 General and administrative 1,011 763 1,942 2,076 $ 2,609 $ 2,340 $ 5,224 $ 5,617
Schedule of Stock Option and Restricted Stock Unit Activity	The following table summarizes the Company’s stock option and RSU activity, excluding market and performance-based RSUs, during the six months ended June 30, 2022: Stock Options Restricted Stock Units Number of Number of Balance as of December 31, 2021 1,279,222 3,387,315 Granted — 72,730 Exercised/Converted (114,155) (420,222) Cancelled/Forfeited (1,500) (69,387) Balances at June 30, 2022 1,163,567 2,970,436
Schedule of Estimated Fair Value of Certain Stock-Based Awards using Black-Scholes-Merton Valuation Model	The fair value of market-based RSUs was measured on the grant date using Monte Carlo simulation model with the following assumptions: Assumptions Weighted-average volatility 66% Risk-free interest rate 2.79% Expected dividends 0%

Income taxes (Tables)

Income taxes (Tables)	6 Months Ended
	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Schedule of Income Tax Provision	The income tax provision in the periods presented is as follows (in thousands): Three Months Ended Six Months Ended 2022 2021 2022 2021 Income tax provision $ (2,521) $ (192) $ (3,093) $ (823)

The Company, basis of present_3

The Company, basis of presentation and significant accounting policies (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Concentration Risk [Line Items]
Asset impairment charges		$ 0
Customer concentration | Total revenue | Three customers
Concentration Risk [Line Items]
Percentage of concentration of credit risk	71%		61%	69%
Customer concentration | Total revenue | Top five customers
Concentration Risk [Line Items]
Percentage of concentration of credit risk	83%		77%	81%	76%
Customer concentration | Total revenue | Four customers
Concentration Risk [Line Items]
Percentage of concentration of credit risk					66%
Customer concentration | Accounts receivable | Three customers
Concentration Risk [Line Items]
Percentage of concentration of credit risk				65%		35%

Revenue - Revenue by Product Gr

Revenue - Revenue by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 95,006	$ 65,010	$ 184,274	$ 125,935
High Speed Products
Disaggregation of Revenue [Line Items]
Total revenue	88,999	61,032	172,580	118,305
Network Products and Solutions
Disaggregation of Revenue [Line Items]
Total revenue	$ 6,007	$ 3,978	$ 11,694	$ 7,630

Revenue - Revenue from External

Revenue - Revenue from External Customers by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 95,006	$ 65,010	$ 184,274	$ 125,935
China
Disaggregation of Revenue [Line Items]
Total revenue	16,389	24,940	36,417	40,183
Americas
Disaggregation of Revenue [Line Items]
Total revenue	12,959	5,997	26,654	11,188
Rest of world
Disaggregation of Revenue [Line Items]
Total revenue	$ 65,658	$ 34,073	$ 121,203	$ 74,564

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract asset balance	$ 0	$ 0

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income (loss)	$ 9,305	$ (17,433)	$ 6,002	$ (28,124)
Weighted average shares used to compute per share amount:
Weighted average shares used to compute per share amount, basic (in shares)	53,488	51,634	53,318	51,178
Weighted average shares used to compute per share amount, diluted (in shares)	56,095	51,634	55,999	51,178
Basic net income (loss) per share (USD per share)	$ 0.17	$ (0.34)	$ 0.11	$ (0.55)
Diluted net income (loss) per share (USD per share)	$ 0.17	$ (0.34)	$ 0.11	$ (0.55)

Net income (loss) per share - P

Net income (loss) per share - Potentially Dilutive Securities Excluded From Computation of Diluted Net Income (Loss) per Share Attributable to Common Stockholders (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	246	4,671	246	4,671
Employee stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	5	1,734	5	1,734
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	1	2,465	1	2,465
Market-based restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	0	265	0	265
Performance-based restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	240	75	240	75
Employee stock purchase plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share
Securities excluded from computation of diluted net loss per share (in shares)	0	132	0	132

Cash, cash equivalents, short_3

Cash, cash equivalents, short-term investments and restricted cash - Short-term Investments and Restricted Cash and Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 77,079	$ 77,833
Restricted cash	38	87
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 77,117	$ 77,920	$ 67,331	$ 95,606

Cash, cash equivalents, short_4

Cash, cash equivalents, short-term investments, and restricted cash - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) investment	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) investment	Jun. 30, 2021 USD ($)
Subsidiary or Equity Method Investee [Line Items]
Asset impairment charges	$ 30,000	$ 0	$ 443,000	$ 0
Realized gains and losses on the sale of marketable securities	$ 0	$ 0	$ 0	$ 0
Marketable securities in an unrealized loss position in excess of 12 months | investment	0		0
Subsidiaries | NeoPhotonics Technics, LLC
Subsidiary or Equity Method Investee [Line Items]
Asset impairment charges			$ 300,000

Cash, cash equivalents, short_5

Cash, cash equivalents, short-term investments and restricted cash - Summary of Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 27,720	$ 27,675
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,720	27,675
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Fair Value	$ 27,720	$ 27,675

Fair value disclosures - Assets

Fair value disclosures - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 27,720,000	$ 27,675,000
Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	0	0
Recurring | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	27,720,000	27,675,000
Recurring | Mutual funds held in Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	706,000	894,000
Recurring | Level 1 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	27,720,000	27,675,000
Recurring | Level 1 | Mutual funds held in Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	706,000	894,000
Recurring | Level 2 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Recurring | Level 2 | Mutual funds held in Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Recurring | Level 3 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Recurring | Level 3 | Mutual funds held in Rabbi Trust
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Nonrecurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	0	0
Fair value of assets	$ 0	$ 0

Balance sheet components - Acco

Balance sheet components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 68,460	$ 55,324
Allowance for doubtful accounts	0	0
Account and trade note receivables, net	$ 68,460	$ 55,324

Balance sheet components - Inve

Balance sheet components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 41,471	$ 32,809
Work in process	13,910	14,851
Finished goods	10,129	5,236
Inventories	65,510	52,896
Finished goods, at vendor managed inventory locations	$ 4,100	$ 1,800

Balance sheet components - Prep

Balance sheet components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Prepaid taxes and taxes receivable	$ 4,150	$ 5,825
Receivables due from suppliers	10,771	6,728
Deposits and other prepaid expenses	2,986	2,682
Other receivable	1,020	1,011
Prepaid expenses and other current assets	$ 18,927	$ 16,246

Balance sheet components - Purc

Balance sheet components - Purchased Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 53,570		$ 53,570		$ 54,688
Accumulated Amortization	(52,783)		(52,783)		(53,844)
Net Assets	787		787		844
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Assets	37,189		37,189		37,814
Accumulated Amortization	(37,189)		(37,189)		(37,814)
Net Assets	0		0		0
Amortization of intangible assets	0	$ 200	0	$ 300
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Assets	15,110		15,110		15,535
Accumulated Amortization	(15,110)		(15,110)		(15,535)
Net Assets	0		0		0
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Gross Assets	1,271		1,271		1,339
Accumulated Amortization	(484)		(484)		(495)
Net Assets	$ 787		$ 787		$ 844

Balance sheet components - Esti

Balance sheet components - Estimated Future Amortization Expense of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
2022 (remaining six months)	$ 14
2023	29
2024	29
2025	29
2026	29
Thereafter	657
Net Assets	$ 787	$ 844

Balance sheet components - Accr

Balance sheet components - Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Employee-related	$ 15,966	$ 14,956
Transition services agreement payable (refer to Note 11)	0	823
Operating lease liabilities, current	2,456	2,356
Income and other taxes payable	4,024	2,703
Accrued warranty	670	977
Other accrued expenses	6,211	8,193
Accrued and other current liabilities	$ 29,327	$ 30,008

Balance sheet components - Warr

Balance sheet components - Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning balance	$ 966	$ 1,096	$ 977	$ 1,111
Warranty accruals	39	4	103	65
Settlements	(335)	(197)	(410)	(273)
Ending balance	$ 670	$ 903	$ 670	$ 903

Balance sheet components - Othe

Balance sheet components - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Pension and other employee-related	$ 2,713	$ 3,266
Asset retirement obligations	3,535	3,508
Government grant	565	369
Other	0	294
Other noncurrent liabilities	$ 6,813	$ 7,437

Restructuring Charges - Summary

Restructuring Charges - Summary of Current Period Accrued Restructuring Costs (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning balance	$ 302
Recoveries	(18)
Cash payments	(284)
Restructuring obligations, ending balance	0
Employee Severance
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning balance	302
Recoveries	(18)
Cash payments	(284)
Restructuring obligations, ending balance	0
Other
Restructuring Reserve [Roll Forward]
Restructuring obligations, beginning balance	0
Recoveries	0
Cash payments	0
Restructuring obligations, ending balance	$ 0

Debt - Components of Debt Oblig

Debt - Components of Debt Obligations and Weighted Average Interest Rate (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Unaccreted discount and issuance costs	$ (158)	$ (180)
Short-term borrowing, net	0	14,914
Finance lease liability	43	94
Total long-term debt	56,506	28,861
Current portion of long-term debt	2,449	2,928
Long-term debt, net of current portion	23,945	25,753
Related party long-term debt	29,954	0
Total long-term debt, net of unaccreted discount and issuance costs	56,348	28,681
Line of credit | Note payable to Shanghai Pudong Development Bank
Debt Instrument [Line Items]
Total short-term debt	0	15,000
Unaccreted discount and issuance costs	0	(86)
Short-term borrowing, net	$ 0	$ 14,914
Interest Rate	0%	0.60%
Line of credit | Related party term loan with Lumentum Holdings Inc.
Debt Instrument [Line Items]
Interest Rate	4%	0%
Long-term debt, current and noncurrent	$ 30,000	$ 0
Line of credit | Borrowing under Wells Fargo Credit Facility
Debt Instrument [Line Items]
Interest Rate	3.12%	1.94%
Long-term debt, current and noncurrent	$ 20,571	$ 20,338
Notes payable to banks | Mitsubishi Bank loans
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	$ 3,438	$ 5,000
Notes payable to banks | Mitsubishi Bank loans | Minimum
Debt Instrument [Line Items]
Interest Rate	1.06%	1.06%
Notes payable to banks | Mitsubishi Bank loans | Maximum
Debt Instrument [Line Items]
Interest Rate	1.46%	1.46%
Notes payable to banks | Mitsubishi Bank and Yamanashi Chuo Bank loan
Debt Instrument [Line Items]
Interest Rate	1.07%	1.06%
Long-term debt, current and noncurrent	$ 2,454	$ 3,429

Debt - Notes Payable and Short-

Debt - Notes Payable and Short-term Borrowing  (Details)	6 Months Ended
	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 CNY (¥)	Jun. 30, 2021 USD ($)
Notes payable | China | Minimum
Debt Instrument [Line Items]
Debt term	3 months
Notes payable | China | Maximum
Debt Instrument [Line Items]
Debt term	6 months
Bankers acceptance
Debt Instrument [Line Items]
Compensating balances	$ 0	$ 0
Credit Line Agreement | Notes payable | China | Subsidiaries | NeoPhotonics (China) Co., Ltd.
Debt Instrument [Line Items]
Line of credit, maximum amount			¥ 120,000,000	$ 17,900,000
Outstanding balance of line of credit facilities	0	$ 15,000,000
Interest rate		3%
Loan fees		2.40%
Credit Line Agreement | Notes payable | China | Subsidiaries | NeoPhotonics Dongguan Co., Ltd
Debt Instrument [Line Items]
Line of credit, maximum amount			¥ 30,000,000	$ 4,500,000
Outstanding balance of line of credit facilities	$ 0	$ 0

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 14, 2022	Jun. 30, 2021	Jun. 30, 2022	Jan. 13, 2022	Dec. 31, 2021	Jan. 13, 2021
Line of credit | A&R Credit Agreement
Line of Credit Facility [Line Items]
Maximum amount		$ 50,000,000
Line of credit | Borrowing under Wells Fargo Credit Facility
Line of Credit Facility [Line Items]
Maximum amount		$ 50,000,000
Cash balance for borrowing		100%
Cash balance max borrowing (up to)		$ 15,000,000
Maximum revolver increase		$ 25,000,000
Commitment fee percent		0.25%
Minimum liquidity	$ 30,000,000			$ 20,000,000
Unused borrowing capacity	6,250,000			$ 5,000,000		$ 5,000,000
Outstanding balance of line of credit facilities			$ 20,600,000
Weighted average interest rate			3.12%		1.94%
Unused part of credit facility			$ 15,400,000
Accrued interest included in balance			100,000
Long-term debt, current and noncurrent			$ 20,571,000		$ 20,338,000
Line of credit | Borrowing under Wells Fargo Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Weighted average interest rate			3.12%
Line of credit | Borrowing under Wells Fargo Credit Facility | Minimum
Line of Credit Facility [Line Items]
Revolver accounts receivable (up to)		80%
Line of credit | Borrowing under Wells Fargo Credit Facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread		1.50%
Line of credit | Borrowing under Wells Fargo Credit Facility | Minimum | Prime rate
Line of Credit Facility [Line Items]
Interest rate spread		0.50%
Line of credit | Borrowing under Wells Fargo Credit Facility | Maximum
Line of Credit Facility [Line Items]
Revolver accounts receivable (up to)		90%
Line of credit | Borrowing under Wells Fargo Credit Facility | Maximum | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread		1.75%
Line of credit | Borrowing under Wells Fargo Credit Facility | Maximum | Prime rate
Line of Credit Facility [Line Items]
Interest rate spread		0.75%
Line of credit | Lumentum subordinated unsecured delayed draw term loan facility
Line of Credit Facility [Line Items]
Unused borrowing capacity	6,250,000
Line of credit | Related party term loan with Lumentum Holdings Inc.
Line of Credit Facility [Line Items]
Weighted average interest rate			4%		0%
Long-term debt, current and noncurrent			$ 30,000,000		$ 0
Subordinated Debt | Lumentum subordinated unsecured delayed draw term loan facility
Line of Credit Facility [Line Items]
Maximum amount	50,000,000
Minimum liquidity	$ 30,000,000
Debt term	2 years
Minimum liquidity prior to initial advances	$ 20,000,000
Subordinated Debt | Lumentum subordinated unsecured delayed draw term loan facility | Merger Agreement is terminated
Line of Credit Facility [Line Items]
Merger termination fee	$ 55,100,000
Subordinated Debt | Lumentum subordinated unsecured delayed draw term loan facility | Merger Agreement is terminated by Lumentum and New Buyer assumes all rights and obligations
Line of Credit Facility [Line Items]
Expiration period	2 years
Subordinated Debt | Lumentum subordinated unsecured delayed draw term loan facility | Merger Agreement is terminated and no Parent Termination Fee is payable
Line of Credit Facility [Line Items]
Expiration period	2 years

Debt - Mitsubishi Bank Loans (D

Debt - Mitsubishi Bank Loans (Details) - Mitsubishi Bank - Notes payable to banks $ in Millions			1 Months Ended
	Feb. 25, 2015 JPY (¥)	Feb. 25, 2015 USD ($)	Jan. 31, 2018 JPY (¥)	Jan. 31, 2018 USD ($)	Mar. 31, 2017 JPY (¥)	Jun. 30, 2022 JPY (¥)	Jun. 30, 2022 USD ($)	Mar. 31, 2017 USD ($)	Feb. 25, 2015 USD ($)
Mitsubishi Bank loans
Debt Instrument [Line Items]
Debt issuance costs	¥ 40,500,000								$ 0.4
Mitsubishi Bank loans | TIBOR
Debt Instrument [Line Items]
Variable rate	1.40%	1.40%
Mitsubishi Bank Term Loan A
Debt Instrument [Line Items]
Debt, aggregate principal amount	¥ 500,000,000								4.4
Repayments of lines of credit			¥ 500,000,000	$ 4.4
Mitsubishi Bank Term Loan B
Debt Instrument [Line Items]
Debt, aggregate principal amount	1,000,000,000								$ 7.3
Debt, periodic principal payments	8,300,000	$ 0.1
Debt, lump sum payment on the maturity date	¥ 8,400,000	$ 0.1
Mitsubishi Bank Term Loan B | TIBOR
Debt Instrument [Line Items]
Variable rate	1.40%	1.40%
2015 Mitsubishi Bank Loan
Debt Instrument [Line Items]
Long-term debt						¥ 266,700,000	$ 2
2017 Mitsubishi Bank Loan
Debt Instrument [Line Items]
Debt, aggregate principal amount					¥ 690,000,000			$ 5.1
Long-term debt						¥ 201,300,000	$ 1.5
Debt term					72 months
Line of credit facility, outstanding					¥ 690,000,000			$ 5.1
2017 Mitsubishi Bank Loan | TIBOR
Debt Instrument [Line Items]
Variable rate					1%

Debt - Mitsubishi Bank and Yama

Debt - Mitsubishi Bank and Yamanashi Chuo Bank Loans (Details) - Mitsubishi Bank and The Yamanashi Chuo Bank, Ltd. - Term Loan C $ in Millions	1 Months Ended
	Jan. 31, 2018 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 JPY (¥)	Jan. 31, 2018 JPY (¥)
Debt Instrument [Line Items]
Line of credit, maximum amount	$ 6.2			¥ 850,000,000
Debt term	82 months
Long-term debt		$ 2.5	¥ 333,900,000
TIBOR
Debt Instrument [Line Items]
Interest rate spread	1%

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Notes Payable and Long-term Borrowings (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Debt Disclosure [Abstract]
2022 (remaining six months)	$ 1,279
2023	2,472
2024	31,838
2025	346
2026	20,571
Total long-term debt, current and non-current	$ 56,506

Leases - Narrative (Details)

Leases - Narrative (Details)	6 Months Ended
	Jun. 30, 2022
Lessee, Lease, Description [Line Items]
Termination period	1 year
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	2 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	6 years

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease cost	$ 754	$ 782	$ 1,512	$ 1,556
Variable and short-term lease cost	628	671	1,306	1,300
Total lease cost	$ 1,382	$ 1,453	$ 2,818	$ 2,856

Leases - Cash Flows (Details)

Leases - Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,670	$ 1,680
Weighted average remaining lease term
Weighted average remaining lease term, operating leases	5 years	5 years 10 months 24 days
Weighted average discount rate
Weighted average discount rate, operating leases	6.30%	6.30%

Leases - Leases, Liability, Mat

Leases - Leases, Liability, Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Operating Leases
2022 (remaining six months)	$ 1,632
2023	3,350
2024	3,331
2025	3,407
2026	3,273
Thereafter	2,128
Total future minimum lease payments	17,121
Less imputed interest	(2,558)
Total	$ 14,563	$ 15,797

Leases - Balance Sheet Informat

Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other current liabilities	Accrued and other current liabilities
Accrued and other current liabilities	$ 2,456	$ 2,356
Operating lease liabilities, noncurrent	12,107	13,441
Total	$ 14,563	$ 15,797

Japan pension plan (Details)

Japan pension plan (Details) - Japan - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension liability	$ 2.2	$ 2.7
Pension liability included in accrued and other current liabilities	$ 0.2	$ 0.3

Commitments and contingencies (

Commitments and contingencies (Details) - APAT OE arbitration - APAT OE - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Commitments And Contingencies Disclosure [Line Items]
Payable due to litigation settlement	$ 0	$ 800,000
Receivable due from litigation settlement	$ 0

Stockholders' equity - Narrativ

Stockholders' equity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2022
Class of Stock [Line Items]
Accumulated deficit subject to restriction	$ 10.5
Accumulated profits (at least)	10%
Employee stock options
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)		5,821,355

Stockholders' equity - Schedule

Stockholders' equity - Schedule of Accumulated Other Comprehensive Income (Loss), Net of Related Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 151,511,000	$ 169,659,000	$ 152,961,000	$ 180,407,000
Other comprehensive loss, net of taxes of zero	(10,150,000)	2,031,000	(11,158,000)	(312,000)
Ending balance	152,274,000	157,392,000	152,274,000	157,392,000
Other comprehensive loss, tax			0
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			2,603,000
Other comprehensive loss, net of taxes of zero			(11,158,000)
Ending balance	(8,555,000)		(8,555,000)
Defined Benefit Pension Plan Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(227,000)
Other comprehensive loss, net of taxes of zero			0
Ending balance	(227,000)		(227,000)
Total Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,368,000	(608,000)	2,376,000	1,735,000
Ending balance	$ (8,782,000)	$ 1,423,000	$ (8,782,000)	$ 1,423,000

Restricted net assets (Details)

Restricted net assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted net assets in the Company's consolidated subsidiaries	$ 10,673		$ 11,381
Stockholders' equity	152,274	$ 151,511	152,961	$ 157,392	$ 169,659	$ 180,407
Cash restricted in China due to unpaid employee benefits and unfulfilled government grants
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted net assets in the Company's consolidated subsidiaries	0		49
China earnings restricted to fund statutory common reserves in China
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted net assets in the Company's consolidated subsidiaries	9,938		10,463
Loan agreements in Japan requiring local subsidiaries to maintain minimum net asset levels
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted net assets in the Company's consolidated subsidiaries	$ 735		$ 869

Stock-based compensation - Summ

Stock-based compensation - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation	$ 2,609	$ 2,340	$ 5,224	$ 5,617
Cost of goods sold
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation	404	572	929	1,120
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation	794	744	1,568	1,606
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation	400	261	785	815
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation	$ 1,011	$ 763	$ 1,942	$ 2,076

Stock-based compensation - Narr

Stock-based compensation - Narrative (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 01, 2021	Jul. 31, 2021	Apr. 30, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Amended 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	900,000
Shares available under the 2020 plan (in shares)	2,821,414
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense				$ 0		$ 0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense				$ 16,700,000		$ 16,700,000
Shares vested (in shares)						420,222
Shares canceled/forfeited (in shares)						69,387
Awards granted in the period (in shares)						72,730
Shares outstanding (in shares)				2,970,436		2,970,436		3,387,315
Market-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grants awarded (in shares)				705,000		705,000
Shares outstanding (in shares)				132,625		132,625
Weighted average closing price vesting trigger				30 days		30 days
Shares vested (in shares)						438,375
Shares canceled/forfeited (in shares)						134,000
Unrecognized share based compensation				$ 0		$ 0
Performance-based RSUs | April 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (in shares)						0
Shares canceled/forfeited (in shares)						14,950
Awards granted in the period (in shares)			90,400
Revenue over four fiscal quarters (at least)			$ 425,000,000
Performance-based RSUs | July 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested (in shares)						0
Shares canceled/forfeited (in shares)						0
Awards granted in the period (in shares)		165,000
Revenue over four fiscal quarters (at least)		$ 100,000,000
SAUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in the period (in shares)				0	0	0	0
Shares outstanding (in shares)				25,000		25,000		25,000
SAU-related liabilities				$ 300,000		$ 300,000		$ 300,000
Inventories
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation capitalized						$ 300,000		$ 400,000

Stock-based compensation - Stoc

Stock-based compensation - Stock Options and RSUs (Details)	6 Months Ended
	Jun. 30, 2022 shares
Stock Options
Number of Shares
Beginning Balance (in shares)	1,279,222
Granted (in shares)	0
Exercised/Converted (in shares)	(114,155)
Cancelled/Forfeited (in shares)	(1,500)
Ending Balance (in shares)	1,163,567
Restricted Stock Units
Number of Units
Beginning Balance (in shares)	3,387,315
Granted (in shares)	72,730
Exercised/Converted (in shares)	(420,222)
Cancelled/Forfeited (in shares)	(69,387)
Ending Balance (in shares)	2,970,436

Stock-based compensation - Valu

Stock-based compensation - Valuation Assumptions of Stock-based Awards (Details) - Market-based RSUs	6 Months Ended
	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average volatility	66%
Risk-free interest rate	2.79%
Expected dividends	0%

Income taxes - Provision for In

Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income tax provision	$ (2,521)	$ (192)	$ (3,093)	$ (823)