Neophotonics (NPTN) 10-K 4 Jun 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	27-May-14	Jun. 30, 2013
Document Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'NPTN	'	'
Entity Registrant Name	'NEOPHOTONICS CORP	'	'
Entity Central Index Key	'0001227025	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'No	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	31,780,761	'
Entity Public Float	'	'	$178,623,115

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$57,101	$36,940	[1]
Short-term investments	17,916	64,301	[1]
Restricted cash	2,138	2,626	[1]
Accounts receivable, net of allowance for doubtful accounts of $531 and $963 at December 31, 2013 and 2012, respectively	64,533	70,354	[1]
Inventories	64,908	43,793	[1]
Prepaid expenses and other current assets	9,977	7,630	[1]
Total current assets	216,573	225,644	[1]
Property, plant and equipment, net	68,851	54,440	[1]
Purchased intangible assets, net	15,005	14,213	[1]
Other long-term assets	1,798	1,335	[1]
Total assets	302,227	295,632	[1]
Current liabilities:	'	'
Accounts payable	48,569	36,308	[1]
Notes payable	9,738	12,003	[1]
Current portion of long-term debt	10,325	5,000	[1]
Accrued and other current liabilities	23,643	19,959	[1]
Total current liabilities	92,275	73,270	[1]
Long-term debt, net of current portion	24,150	17,167	[1]
Deferred income tax liabilities	1,004	653	[1]
Other noncurrent liabilities	7,987	1,862	[1]
Total liabilities	125,416	92,952	[1]
Commitments and contingencies (Note 13)	'	'	[1]
Stockholders’ equity:	'	'
Preferred stock, $0.0025 par value, 10,000,000 shares authorized, no shares issued or outstanding	'	'	[1]
Common stock, $0.0025 par value, 100,000,000 shares authorized At December 31, 2013, 31,571,584 shares issued and outstanding; At December 31, 2012, 30,546,155 shares issued and outstanding	79	76	[1]
Additional paid-in capital	447,467	438,858	[1]
Accumulated other comprehensive income	11,687	11,829	[1]
Accumulated deficit	-282,422	-248,083	[1]
Total stockholders’ equity	176,811	202,680	[1]
Total liabilities and stockholders’ equity	$302,227	$295,632	[1]
[1]	Revised

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Accounts receivable, Net allowance for doubtful accounts	$531	$963
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	31,571,584	30,546,155
Common stock, shares outstanding	31,571,584	30,546,155

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue	$282,242	$245,423	$201,029
Cost of goods sold	217,069	184,163	150,944
Gross profit	65,173	61,260	50,085
Operating expenses:	'	'	'
Research and development	45,853	38,288	30,855
Sales and marketing	14,242	13,241	11,686
General and administrative	30,012	24,361	20,911
Acquisition-related transaction costs	5,406	1,447	989
Amortization of purchased intangible assets	1,532	1,316	994
Adjustment to fair value of contingent consideration	1,026	-554	-1,287
Goodwill impairment charges	0	0	13,106
Restructuring charges	775	68	1,297
Total operating expenses	98,846	78,167	78,551
Loss from operations	-33,673	-16,907	-28,466
Interest income	348	592	407
Interest expense	-996	-568	-422
Other income (expense), net	1,186	575	14,246
Total interest and other income (expense), net	538	599	14,231
Loss before income taxes	-33,135	-16,308	-14,235
Provision for income taxes	-1,204	-1,364	-1,155
Loss from continuing operations	-34,339	-17,672	-15,390
Income from discontinued operations, net of tax	'	142	636
Net loss	-34,339	-17,530	-14,754
Deemed dividend on beneficial conversion of Series X redeemable convertible preferred stock	'	'	-17,049
Accretion of redeemable convertible preferred stock	'	'	-7
Net loss attributable to NeoPhotonics Corporation common stockholders	($34,339)	($17,530)	($31,810)
Basic and diluted net income (loss) per share attributable to NeoPhotonics Corporation common stockholders:	'	'	'
Continuing operations	($1.11)	($0.62)	($1.45)
Discontinued operations	'	'	$0.03
Net loss	($1.11)	($0.62)	($1.42)
Basic and diluted weighted average shares used to compute net loss per share attributable to NeoPhotonics Corporation common stockholders	31,000,325	28,529,849	22,359,802

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net loss	($34,339)	($17,530)	($14,754)
Other comprehensive income (loss)	'	'	'
Foreign currency translation adjustments (net of zero tax)	41	101	3,265
Defined benefit pension plans adjustment (net of tax of $73)	-118	'	'
Total other comprehensive income (loss)	-142	476	-1,454
Comprehensive loss	-34,481	-17,054	-16,208
Available-for-Sale Securities	'	'	'
Other comprehensive income (loss)	'	'	'
Unrealized gains (losses)	-65	375	-307
Sale of Equity Investment	'	'	'
Other comprehensive income (loss)	'	'	'
Unrealized gains (losses)	'	'	8,291
Less: Reclassification adjustment for gain on sale of equity investment included in net income (net of zero tax)	'	'	($12,703)

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Foreign currency translation adjustments, tax	$0	$0	$0
Defined benefit pension plans adjustment, Tax	73	'	'
Available-for-Sale Securities	'	'	'
Unrealized gains (losses), tax	0	0	0
Sale of Equity Investment	'	'	'
Unrealized gains (losses), tax	0	0	0
Reclassification adjustment for gain on sale of equity investment, tax	$0	$0	$0

Consolidated_Statements_of_Red

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (USD $)	Total		Redeemable convertible preferred stock	Common Stock	Additional paid-in capital	Accumulated other comprehensive income	Accumulated deficit
In Thousands, except Share data
Balances at Dec. 31, 2010	($109,638)		$211,541	$5	$93,349	$12,807	($215,799)
Beginning (in shares) at Dec. 31, 2010	'		6,658,010	1,955,280	'	'	'
Comprehensive loss	-16,208		'	'	'	-1,454	-14,754
Accretion of preferred stock to redemption value	-7		7	'	-7	'	'
Deemed dividend on beneficial conversion of Series X redeemable convertible preferred stock	-17,049		17,049	'	-17,049	'	'
Issuance of common stock upon initial public offering at $11.00 per share, net of issuance costs of $4,263	83,971		'	22	83,949	'	'
Issuance of common stock upon initial public offering at $11.00 per share, net of issuance costs of $4,263 (in shares)	'		'	8,625,000	'	'	'
Conversion of preferred stock into shares of common stock	228,597		-228,597	35	228,562	'	'
Conversion of preferred stock into shares of common stock (in shares)	'		-6,658,010	14,038,489	'	'	'
Issuance of common stock upon exercise of stock options	340		'	'	340	'	'
Issuance of common stock upon exercise of stock options (in shares)	'		'	79,144	'	'	'
Repurchase of common stock	'		'	'	'	'	'
Repurchase of common stock (in shares)	'		'	-51	'	'	'
Issuance of common stock under employee stock purchase plan	863		'	'	863	'	'
Issuance of common stock under employee stock purchase plan (in shares)	'		'	164,723	'	'	'
Vesting of early exercised stock options	19		'	'	19	'	'
Stock-based compensation expense	2,766		'	'	2,766	'	'
Balances at Dec. 31, 2011	173,654		'	62	392,792	11,353	-230,553
Beginning (in shares) at Dec. 31, 2011	'		'	24,862,585	'	'	'
Comprehensive loss	-17,054		'	'	'	476	-17,530
Initial public offering cost adjustment	63		'	'	63	'	'
Issuance of common stock for investment (revised, see Note 1)	39,401		'	12	39,389	'	'
Issuance of common stock for investment (revised, see Note 1) (in shares)	'		'	4,972,905	'	'	'
Issuance of common stock upon exercise of stock options	102		'	1	101	'	'
Issuance of common stock upon exercise of stock options (in shares)	'		'	190,554	'	'	'
Issuance of common stock under employee stock purchase plan	1,866		'	1	1,865	'	'
Issuance of common stock under employee stock purchase plan (in shares)	'		'	520,111	'	'	'
Stock-based compensation expense	4,648		'	'	4,648	'	'
Balances at Dec. 31, 2012	202,680	[1]	'	76	438,858	11,829	-248,083
Beginning (in shares) at Dec. 31, 2012	'		'	30,546,155	'	'	'
Comprehensive loss	-34,481		'	'	'	-142	-34,339
Issuance of common stock upon exercise of stock options	1,213		'	1	1,212	'	'
Issuance of common stock upon exercise of stock options (in shares)	260,604		'	260,604	'	'	'
Issuance of common stock under employee stock purchase plan	2,157		'	2	2,155	'	'
Issuance of common stock under employee stock purchase plan (in shares)	'		'	487,856	'	'	'
Issuance of common stock for vested restricted stock units	'		'	'	'	'	'
Issuance of common stock for vested restricted stock units (in shares)	'		'	276,969	'	'	'
Tax withholding related to vesting of restricted stock units	-565		'	'	-565	'	'
Stock-based compensation expense	5,807		'	'	5,807	'	'
Balances at Dec. 31, 2013	$176,811		'	$79	$447,467	$11,687	($282,422)
Beginning (in shares) at Dec. 31, 2013	'		'	31,571,584	'	'	'
[1]	Revised

Consolidated_Statements_of_Red1

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011
Issuance of common stock upon initial public offering, per share	$11
Issuance of common stock upon initial public offering, issuance cost	$4,263

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash flows from operating activities	'		'		'
Net loss	($34,339)		($17,530)		($14,754)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:	'		'		'
Depreciation and amortization	20,381		18,716		12,931
Goodwill impairment charges	0		0		13,106
Stock-based compensation expense	5,736		4,777		3,156
Deferred taxes	-469		221		-452
Investment-related amortization and accrued interest	1,003		585		345
Loss on disposal of property and equipment	710		152		224
Adjustment to fair value of contingent consideration	1,026		-554		-1,287
Adjustment to fair value of penalty payment derivative	101		'		'
Gain on sale of an unconsolidated investee, net of direct cost	'		'		-13,867
Gain on discontinued operations	'		-750		'
Allowance for doubtful accounts	-253		312		535
Write-down of inventories	3,207		3,132		680
Others	-667		'		'
Change in assets and liabilities, net of effects of acquisitions:	'		'		'
Accounts receivable	7,234		-1,802		-2,750
Inventories	-10,458		-11,828		-8,508
Prepaid expenses and other assets	-1,795		-199		1,795
Accounts payable	7,712		-2,992		-452
Accrued and other liabilities	5,382		-1,030		-3,212
Net cash provided by (used in) operating activities	4,511		-8,790		-12,510
Cash flows from investing activities	'		'		'
Purchase of property, plant and equipment	-19,566		-12,738		-11,677
Proceeds from disposition of property, plant and equipment	92		'		'
Purchase of marketable securities	-58,860		-155,887		-172,972
Proceeds from sale of marketable securities	53,847		104,258		113,909
Proceeds from maturity of securities	50,358		40,935		4,623
Decrease (increase) in restricted cash	561		608		-48
Acquisitions, net of cash acquired	-13,128		'		-38,986
Proceeds received on sale of discontinued operations, net of tax	'		1,825		'
Proceeds from sale of an unconsolidated investee	'		'		21,288
Net cash provided by (used in) investing activities	13,304		-20,999		-83,863
Cash flows from financing activities	'		'		'
Proceeds from initial public offering of common stock, net of issuance costs	'		'		86,412
Proceeds from issuance of common stock, net of issuance costs	'		39,636		'
Proceeds from exercise of stock options and issuance of stock under ESPP	3,370		2,070		1,204
Tax withholding on restricted stock units	-565		'		'
Proceeds from bank loans	26,443		'		28,000
Repayment of bank loans	-24,110		-5,000		-14,214
Proceeds from issuance of notes payable	19,543		25,959		29,390
Repayment of notes payable	-22,166		-28,601		-28,157
Net cash provided by financing activities	2,515		34,064		102,635
Effect of exchange rates on cash and cash equivalents	-169		180		758
Net increase in cash and cash equivalents	20,161		4,455		7,020
Cash and cash equivalents at the beginning of the period	36,940	[1]	32,485		25,465
Cash and cash equivalents at the end of the period	57,101		36,940	[1]	32,485
Supplemental disclosure of cash flow information:	'		'		'
Cash paid for interest	837		571		368
Cash paid for income taxes	1,013		531		1,532
Supplemental disclosure of noncash investing and financing activities:	'		'		'
Changes in accounts payable and accrued liabilities related to property and equipment purchases	-1,397		2,551		986
Issuance of notes to the seller of acquired business	11,130		'		'
Accretion of redeemable convertible preferred stock	'		'		7
Conversion of preferred stock to common stock upon IPO	'		'		$228,597
[1]	Revised

The_Company_and_Basis_of_Prese

The Company and Basis of Presentation	12 Months Ended
	Dec. 31, 2013
The Company and Basis of Presentation	'
	1. The Company and basis of presentation
	Business and organization
	NeoPhotonics Corporation and its subsidiaries (NeoPhotonics or the Company) is a leading designer and manufacturer of PIC-based modules and subsystems for bandwidth-intensive, high-speed communications networks.
	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. and world economies, the highly cyclical nature of the industries the Company serves; the loss of any of a small number of its larger customers; ability to obtain additional financing; inability to meet certain debt covenants; failure to successfully integrate completed acquisitions; fundamental changes in the technology underlying the Company’s products; the hiring, training and retention of key employees; successful and timely completion of product design efforts; and new product design introductions by competitors.
	Revision of Prior Period Balance Sheet
	As further described in Note 14, the Company may be required to pay a $5.0 million penalty if it does not achieve certain performance obligations agreed to in connection with the sale of its common stock in a private placement transaction in April 2012. The penalty payment was originally classified outside of equity as redeemable common stock at December 31, 2012 since, while the Company intends to meet its performance obligations, it determined the ability to satisfy some of the obligations may be outside of the Company’s control. The Company has since determined that the $5.0 million penalty payment is an embedded derivative instrument, with the underlying being the performance or nonperformance of meeting its performance obligations by the deadline, and has revised to correctly classify $4.9 million of the $5.0 million to additional paid-in capital and the remaining $0.1 million, representing the estimated fair value of the penalty payment derivative, to other noncurrent liabilities at December 31, 2012.  The Company has assessed the impact of the correction on the 2012 interim and annual consolidated balance sheets and has concluded that the correction is not material to the previously reported consolidated balance sheets.   The effect on the Company’s balance sheet at December 31, 2012 for this matter was as follows:
		December 31, 2012
	(in thousands)	Previously		As Revised
		Reported
	Other noncurrent liabilities	$	1,724	$	1,862
	Redeemable common stock		5,000		—
	Additional paid-in capital		433,996		438,858
	Discontinued operations
	In January 2012, the Company entered into a purchase agreement with a third party to divest its 100% equity interest in Shenzhen Photon Broadband Technology Co., Ltd. (Broadband), a subsidiary in China, for a total cash consideration of RMB 13.0 million ($2.1 million), and the transaction closed in March 2012. As such, the results of operations associated with Broadband are presented as discontinued operations in the Company’s consolidated statements of operations for 2011 and 2012. Unless otherwise indicated, all discussions herein relate to the Company’s continuing operations.
	Consolidation
	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies	'
	2. Summary of significant accounting policies
	Use of estimates
	The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported revenue and expenses during the reporting period. Significant estimates made by management include: the useful lives of property, plant and equipment and intangible assets as well as future cash flows to be generated by those assets; fair values of identifiable assets acquired and liabilities assumed in business combinations; allowances for doubtful accounts; valuation allowances for deferred tax assets; write off of excess and obsolete inventories and the valuations and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
	Concentration of credit risk and significant customers
	Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents and trade accounts receivable. The Company’s investment policy requires cash and cash equivalents to be placed with high-credit quality institutions and limits on the amount of credit risk from any one issuer. The Company performs ongoing credit evaluations of its customers’ financial condition whenever deemed necessary and generally does not require collateral. The Company maintains an allowance for doubtful accounts based upon the expected collectability of all accounts receivable, which takes into consideration an analysis of historical bad debts, specific customer creditworthiness and current economic trends.
	For the year ended December 2013, three customers accounted for 27%, 16% and 14% of the Company’s total revenue. For the year ended December 31, 2012, three customers accounted for 36%, 16% and 15% of the Company’s total revenue. For the year ended December 31, 2011, a single customer accounted for 51% of the Company’s total revenue. No other customers accounted for 10% or more of total revenue in any year presented.
	As of December 31, 2013, two customers accounted for 14% and 10% for the Company’s total accounts receivable and as of December 31, 2012, two customers accounted for 42% and 16% of the Company’s total accounts receivable. No other customers accounted for 10% or more of total accounts receivable as of December 31, 2013 or 2012.
	Restricted cash
	As a condition of the notes payable lending arrangements of the Company’s subsidiaries in China, these subsidiaries are required to keep a compensating balance at the issuing banks that is a percentage of the total notes payable balance until the notes payable are paid. These balances have been excluded from the Company’s cash and cash equivalents balance and are classified as restricted cash on the Company’s consolidated balance sheets. As of December 31, 2013 and 2012, the amount of restricted cash was $2.1 million and $2.6 million, respectively.
	Cash, cash equivalents and investments
	Highly liquid investments with a maturity of 90 days or less at the date of purchase are considered cash equivalents. Cash and cash equivalents consist primarily of bank deposits.  The Company’s policy is to classify money market accounts as short-term investments other than minor amounts included in cash equivalents for administrative purposes.
	The Company regularly reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. Factors considered in determining whether a loss is other-than-temporary include: the length of time and extent to which the fair market value has been lower than the cost basis, the financial condition and near-term prospects of the investee, credit quality, likelihood of recovery, and the Company’s ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in fair market value.
	Unrealized gains and losses, net of tax, are included in accumulated other comprehensive income as a separate component of stockholders’ equity on the consolidated balance sheets. The amortization of premiums and discounts on the investments, and realized gains and losses on available-for-sale securities are included in other income (expense), net in the consolidated statements of operations. The Company uses the specific-identification method to determine cost in calculating realized gains and losses upon sale of its marketable securities.
	Marketable securities are reported at fair value and are classified as available-for-sale investments in our current assets because they represent investments of cash available for current operations.
	Fair Value Measurements
	Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties. A liability’s fair value is defined as the amount that would be paid to transfer the liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative accounting guidance describes a fair value hierarchy based on three levels of inputs that may be used to measure fair value, of which the first two are considered observable and the last is considered unobservable. These levels of inputs are as follows:
	Level 1—Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.
	Level 2—Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the asset or liability. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
	Level 3—Unobservable inputs that reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.
	For marketable securities measured at fair value using Level 2 inputs, we review trading activity and pricing for these investments as of the measurement date. When sufficient quoted pricing for identical securities is not available, we use market pricing and other observable market inputs for similar securities obtained from various third party data providers. These inputs either represent quoted prices for similar assets in active markets or have been derived from observable market data.
	Accounts receivable
	Accounts receivable include trade receivables and notes receivable from customers. The Company receives notes receivable in exchange for accounts receivable from certain customers in China that are secured by the customer’s affiliated financial institution. The notes are generally due within 6 months.
	An allowance for doubtful accounts is calculated based on the aging of the Company’s trade receivables, historical experience, and management judgment. The Company writes off trade receivables against the allowance when management determines a balance is uncollectible and no longer actively pursues collection of the receivable.
	Inventories
	Inventories consist of on-hand raw materials, work-in-progress inventories and finished goods. Raw materials and work-in-process inventories are stored mainly on the Company’s premises. Finished goods are stored on the Company’s premises as well as on consignment at certain customer sites.
	Inventories are stated at the lower of standard cost, which approximates actual cost determined on the weighted average basis, or market value. Inventories are recorded using the first-in, first-out method. The Company routinely evaluates quantities and values of inventories in light of current market conditions and market trends, and records a write-down for quantities in excess of demand and product obsolescence. The evaluation may take into consideration historic usage, expected demand, anticipated sales price, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, customer concentrations, product merchantability and other factors. Market conditions are subject to change and actual consumption of inventory could differ from forecasted demand. The Company also regularly reviews the cost of inventories against their estimated market value and records a lower of cost or market write-down for inventories that have a cost in excess of estimated market value, resulting in a new cost basis for the related inventories which is not reversed.
	Business Combinations
	We allocate the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair values of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to intangible assets.
	Fair value estimates are based on the assumptions management believes a market participant would use in pricing the asset or liability. Critical estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from customer relationships and acquired patents and developed technology; and discount rates. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates.
	Amounts recorded in a business combination may change during the measurement period, which is a period not to exceed one year from the date of acquisition, as additional information about conditions existing at the acquisition date becomes available.
	Goodwill
	Goodwill is reviewed for impairment at least annually or more frequently if events or changes in circumstances indicate that the carrying value of goodwill may not be recoverable. The Company will first assess the qualitative factors to determine whether it is more likely than not that the fair value of our single reporting operating unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment under Accounting Standards Update (ASU) No. 2011-08, Goodwill and Other (Topic 350): Testing Goodwill for Impairment, issued by the Financial Accounting Standards Board (FASB). If the Company determines that it is more likely than not that its fair value is less than its carrying amount, then the two-step goodwill impairment test is performed. The first step, identifying a potential impairment, compares the fair value of the reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step would need to be performed; otherwise, no further steps are required. The second step, measuring the impairment loss, compares the implied fair value of the goodwill with the carrying amount of the goodwill. Any excess of the goodwill carrying amount over the applied fair value is recognized as an impairment loss, and the carrying value of goodwill is written down to fair value. The Company recognized a goodwill impairment charge of $13.1 million in 2011 and did not have any goodwill on its consolidated balance sheets at December 31, 2013 or 2012.
	Long-lived assets
	Property, plant and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization is computed using the straight-line method over the following estimated useful lives:
	Buildings	20-30 years
	Machinery and equipment	2-7 years
	Furniture, fixtures and office equipment	3-5 years
	Software	5-7 years
	Leasehold improvements	life of the asset or lease term, if shorter
	Repairs and maintenance costs are expensed as incurred.
	Intangible assets acquired in a business combination are recorded at fair value. Identifiable finite-lived intangible assets are amortized over the period of estimated benefit using the straight-line method, reflecting the pattern of economic benefits associated with these assets. The estimated useful lives of the Company’s intangible assets generally range from five to seven years, except for acquired land use rights in China, which have an estimated useful life of 45 years.
	The carrying value of intangible assets and other long-lived assets is reviewed on a regular basis for the existence of facts or circumstances, both internally and externally, that may suggest impairment. Some factors which the Company considers to be triggering events for impairment review include a significant decrease in the market value of an asset, a significant change in the extent or manner in which an asset is used, a significant adverse change in the business climate that could affect the value of an asset, an accumulation of costs for an asset in excess of the amount originally expected, a current period operating loss or cash flow decline combined with a history of operating loss or cash flow uses or a projection that demonstrates continuing losses and a current expectation that, it is more likely than not, a long-lived asset will be disposed of at a loss before the end of its estimated useful life.
	If one or more of such facts or circumstances exist, the Company will evaluate the carrying value of long-lived assets to determine if impairment exists, by comparing it to estimated undiscounted future cash flows over the remaining useful life of the assets. If the carrying value of the assets is greater than the estimated future cash flow, the assets are written down to the estimated fair value. The Company’s cash flow estimates contain management’s best estimates, using appropriate and customary assumptions and projections at the time. Any write-down would be treated as a permanent reduction in the carrying amount of the asset and an operating loss would be recognized.
	Revenue recognition
	Revenue is derived from the sale of the Company’s products. The Company recognizes revenue provided that persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable and collectability is reasonably assured. Contracts and/or customer purchase orders are used to determine the existence of an arrangement. Delivery is considered to have occurred when title and risk of loss have transferred to the customer. The price is equal to the amount invoiced to the customer and is not subject to adjustment and customers do not have the right of return. The Company evaluates the creditworthiness of its customers to determine that appropriate credit limits are established prior to the acceptance of an order.
	Revenue is recognized when the product is shipped and title has transferred to the buyer. The Company bears all costs and risks of loss or damage to the goods up to that point. On most orders, the Company’s shipment terms provide that title passes to the buyer upon shipment by the Company. Other shipment terms may provide that title passes to the buyer upon delivery of the goods to the buyer. Revenue related to the sale of consignment inventory at customer vendor managed locations is not recognized until the product is pulled from inventory stock by customers. Shipping and handling costs are included in the cost of goods sold. The Company presents revenue net of sales taxes and any similar assessments.
	Product warranties
	The Company provides warranties to cover defects in workmanship, materials and manufacturing for a period of one to two years to meet the stated functionality as agreed to in each sales arrangement. Products are tested against specified functionality requirements prior to delivery, but the Company nevertheless from time to time experiences claims under its warranty guarantees. The Company accrues for estimated warranty costs under those guarantees based upon historical experience, and for specific items, at the time their existence is known and the amounts are determinable.
	Research and development
	Research and development expense consists of personnel costs, including stock-based compensation expense, for the Company’s research and development personnel and product development costs, including engineering services, development software and hardware tools, depreciation of capital equipment and facility costs. Research and development costs are expensed as incurred.
	Advertising costs
	Advertising costs are expensed as incurred and, to date, have not been significant.
	Stock-based compensation
	The Company grants stock options, stock purchase rights, stock appreciation units and restricted stock units to employees, consultants and directors. The stock-based awards are accounted for at fair value.
	The Company generally determines the fair value of stock options on the date of grant utilizing the Black-Scholes-Merton option-pricing model. The fair value of the options is recognized over the period during which an employee is required to provide services in exchange for the option award, known as the requisite service period (usually the vesting period) on a straight-line basis.
	Stock purchase rights are accounted for at fair value, utilizing the Black-Scholes-Merton option-pricing model. The expense for each purchase period is recognized on a straight-line basis over the requisite service period, from the beginning of the offering period through the respective purchase date.
	The Company records an expense (credit) and an equal adjustment to the liability for stock appreciation units equal to the fair value of the vested portion of the awards as of each period end. Each reporting period thereafter, compensation expense will be recorded, based on the remaining service period and the then fair value of the award until vesting of the award is completed. After vesting is completed, the Company will continue to re-measure the fair value of the liability until the award is exercised or expires, with changes in the fair value of the liability recorded in the consolidated statements of operations.
	Restricted stock units are valued at the closing sales price as quoted on the New York Stock Exchange on the date of grant, and are converted into shares of common stock upon vesting on a one-for-one basis. Vesting of restricted stock units is subject to the employee’s continuing service to the Company. The compensation expense related to the restricted stock units is determined using the fair value of common stock on the date of grant, and the expense is recognized on a straight-line basis over the vesting period.
	Stock-based compensation expense recognized at fair value includes the impact of estimated forfeitures. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	Income taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the carrying amounts of existing assets and liabilities in the financial statements and their respective tax bases, and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in the consolidated statement of operations in the period that includes the enactment date.
	The Company operates in various tax jurisdictions and is subject to audit by various tax authorities. In preparing the Company’s consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. The Company estimates actual current tax exposure as well as assesses temporary differences resulting from different treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets which represent future tax benefits to be received when certain expenses previously recognized in the financial statements become deductible expenses under applicable income tax laws, or loss credit carryforwards are utilized.
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of a deferred tax asset will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. A valuation allowance is recorded for loss carryforwards and other deferred tax assets where it is more likely than not that such deferred tax assets will not be realized.
Foreign currency
Generally the functional currency of the Company’s international subsidiaries is the local currency. The Company translates the financial statements of these subsidiaries to U.S. dollars using month-end rates of exchange for assets and liabilities, and average rates of exchange for revenue, costs, and expenses. Translation gains and losses are recorded in accumulated other comprehensive income as a component of stockholders’ equity. Net gains (losses) resulting from foreign exchange transactions were $0.9 million, ($0.2) million, and ($0.1) million for the years ended December 31, 2013, 2012, and 2011, respectively. These gains and losses were recorded as other income (expense), net in our consolidated statements of operations.
Net income (loss) per share attributable to NeoPhotonics Corporation common stockholders
The Company applies the two-class method for calculating and presenting net income (loss) per share attributable to NeoPhotonics Corporation common stockholders. Under the two-class method, net income (loss) is allocated between common shares and other participating securities based on their participating rights. Participating securities are defined as securities that participate in dividends with common shares according to a predetermined formula. Basic net income (loss) per share attributable to NeoPhotonics Corporation common stockholders is calculated by dividing net income (loss) attributable to NeoPhotonics Corporation common stockholders by the weighted average number of shares outstanding for the period. Diluted net income (loss) per share attributable to NeoPhotonics Corporation common stockholders is calculated by dividing net income (loss) attributable to NeoPhotonics Corporation common stockholders and income allocable to participating securities to the extent it is dilutive, by the weighted average number of common shares and potential dilutive common share equivalents outstanding during the period if the effect is dilutive.
Recent accounting pronouncements
In February 2013, the FASB issued amendments to the FASB Accounting Standard Codification to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments require new disclosures for items reclassified out of accumulated other comprehensive income (“AOCI”), including (1) changes in AOCI balances by component and (2) significant items reclassified out of AOCI. The guidance does not amend any existing requirements for reporting net income or OCI in the financial statements. As this guidance only requires expanded disclosures, the adoption of this guidance did not have a material effect on the Company’s consolidated financial statements.
In March 2013, the FASB issued amendments to the FASB Accounting Standard Codification, which indicates that the entire amount of a cumulative translation adjustment related to an entity’s investment in a foreign entity should be released when there has been a (i) sale of a subsidiary or group of net assets within a foreign entity and the sale represents the substantially complete liquidation of the investment in the foreign entity, (ii) loss of a controlling financial interest in an investment in a foreign entity, or (iii) step acquisition for a foreign entity. The amendments were effective prospectively for fiscal years beginning after December 15, 2013. Early adoption is permitted. The adoption of this guidance did not have an impact on the Company’s consolidated financial statements.
In July 2013, the FASB issued amendments to the FASB Accounting Standard Codification on Income Taxes, to improve the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This guidance is expected to reduce diversity in practice and is expected to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. This guidance was effective for reporting periods beginning after December 15, 2013. The adoption of this guidance did not have an impact on the Company’s consolidated financial statements.
In April 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08") which raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. ASU 2014-08 is effective for annual periods beginning on or after December 15, 2014. Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company is currently in the process of evaluating the impact of the adoption on its consolidated financial statements.
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  The Company is in the process of evaluating the impact of adoption on its consolidated financial statements.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations	'
	3. Discontinued Operations
	The Company entered into a purchase agreement to dispose of its 100% equity interest in Shenzhen Photon Broadband Technology Co., Ltd. (“Broadband”), a subsidiary in China, for total cash consideration of RMB 13.0 million ($2.1 million). The transaction closed on March 13, 2012. The Company recognized a gain of $0.6 million on the sale of Broadband, representing the difference between the consideration received and the net assets transferred to the buyer, net of tax, which was included in its consolidated statement of operations in 2012.
	The results of operations associated with Broadband are presented as discontinued operations in the Company’s consolidated statements of operations for the years ended December 31, 2012 and 2011. Revenue and the components of net income related to the discontinued operations were as follows (in thousands):
		2012			2011
	Revenue	$	590		$	5,085
	Income from discontinued operations before income taxes	$	256		$	318
	Benefit from (provision for) income taxes		(114	)		318
	Net income from discontinued operations	$	142		$	636

Cash_Cash_Equivalents_and_Shor

Cash, Cash Equivalents and Short-Term Investments	12 Months Ended
	Dec. 31, 2013
Cash, Cash Equivalents and Short-Term Investments	'
	4. Cash, cash equivalents and short-term investments
	The following table summarizes the Company’s unrealized gains and losses related to the cash, cash equivalents and investments in marketable securities designated as available-for-sale (in thousands):
		As of December 31, 2013									As of December 31, 2012
		Amortized		Gross		Gross			Fair		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value		Cost		Unrealized		Unrealized			Value
				Gains		Losses							Gains		Losses
	Cash and cash equivalents
	Money market funds	$	11	$	—	$	—		$	11	$	11	$	—	$	—		$	11
	Short-term investments
	Money market funds		4,577		—		—			4,577		7,259		—		—			7,259
	Corporate bonds		6,708		3		(5	)		6,706		23,151		43		(1	)		23,193
	U.S. federal agencies		—		—		—			—		27,241		10		—			27,251
	Foreign bonds and notes		4,827		5		—			4,832		4,682		14		—			4,696
	Variable rate demand notes		1,801		—		—			1,801		1,902		—		—			1,902
	Total short-term investments		17,913		8		(5	)		17,916		64,235		67		(1	)		64,301
	Total	$	17,924	$	8	$	(5	)	$	17,927	$	64,246	$	67	$	(1	)	$	64,312
	Realized gains and losses on the sale of marketable securities during the years ended December 31, 2013 and 2012 were immaterial. Variable rate demand notes (VRDNs) are floating rate municipal bonds with embedded put options that allow the bondholder to sell the security at par plus accrued interest. All of the put options are secured by a pledged liquidity source. While they are classified as short-term investments, the put option allows the VRDNs to be liquidated at par on a seven day settlement basis.
	The following table summarizes the estimated fair value of the short-term investments in marketable securities designated as available-for-sale and classified by the contractual maturity date of the security as of December 31, 2013 and 2012 (in thousands):
		December 31,		December 31,
		2013		2012
	Less than 1 year	$	14,118	$	51,861
	Due in 1 to 2 years		2,008		10,550
	Due in 2 to 5 years		—		—
	Due after 5 years		1,801		1,901
	Total	$	17,927	$	64,312
	There were no securities in a continuous loss position for 12 months or longer as of December 31, 2013 or 2012.
	Other investments
	In the second quarter of 2011, the Company sold all of its shares in Ignis, a Norwegian company, for gross proceeds of $21.3 million and recognized a gain of $13.8 million. The gain was included in other income (expense), net in the Company’s consolidated statement of operations for the year ended December 31, 2011.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Measurements	'
	5. Fair value measurements
	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 December 31, 2013								As of December 31, 2012
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash, cash equivalents and short-term investments:
	Money market funds	$	4,588	$	—	$	—	$	4,588	$	7,270	$	—	$	—	$	7,270
	Corporate bonds		—		6,706		—		6,706		—		23,193		—		23,193
	U.S. federal agencies		—		—		—		—		—		27,251		—		27,251
	Foreign bonds and notes		—		4,832		—		4,832		—		4,696		—		4,696
	Variable rate demand notes		—		1,801		—		1,801		—		1,902		—		1,902
	Mutual funds held in Rabbi Trust		442		—		—		442		188		—		—		188
	Additionally, the Company’s cash equivalents at December 31, 2013 and 2012 included time deposits of $6.5 million and $14.7 million, respectively, for which the fair value approximates the carrying amount using inputs classified as level 2 in the fair value hierarchy.
	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 December 31, 2013. 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 consolidated balance sheets at December 31, 2013 and 2012.
	The following table presents the Company’s liabilities that are measured at fair value on a recurring basis (in thousands):
		As of December 31, 2013								As of December 31, 2012
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Contingent consideration	$	—	$	—	$	1,985	$	1,985	$	—	$	—	$	959	$	959
	(Note 13)
	Penalty payment derivative	$	—	$	—	$	239	$	239	$	—	$	—	$	138	$	138
	(Note 14)
	There were no transfers between levels of the fair value hierarchy during either 2013 or 2012.
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
	Certain of the Company’s assets, including intangible assets and goodwill are re-measured at fair value if impairment is indicated.
	During 2011, the Company recorded a goodwill impairment charge of $13.1 million (See Note 8). This fair value measurement was calculated using unobservable inputs, using both the income and market approach, which are classified as Level 3 within the fair value hierarchy. Inputs for the income approach included the amount and timing of future cash flows based on the Company’s operational budgets, strategic plans, terminal growth rates assumptions and other estimates. The primary input for the market approach included market multiples for guideline companies that operate in a similar business environment.
	Assets and Liabilities Not Measured at Fair Value
	The carrying values of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and notes payable approximate their fair values due to the short-term nature and liquidity of these financial instruments.
	The fair values of the Company’s long-term debt have been calculated using an estimate of the interest rate the Company would have had to pay on the issuance of liabilities with a similar maturity and discounting the cash flows at that rate which it considers to be a level 2 fair value measurement. The fair values do not necessarily give an indication of the amount that the Company would currently have to pay to extinguish any of this debt.
	The fair value of the Company’s variable rate bank borrowings was not materially different than its carrying value at December 31, 2013 as the interest rates approximated rates currently available to the Company and was approximately $21.2 million (carrying value of $22.2 million) at December 31, 2012. The fair value of the Company’s acquisition-related debt was approximately $10.0 million (carrying value of $9.975 million) at December 31, 2013.

Net_Income_Loss_per_Share_Attr

Net Income (Loss) per Share Attributable to NeoPhotonics Corporation Common Stockholders	12 Months Ended
	Dec. 31, 2013
Net Income (Loss) per Share Attributable to NeoPhotonics Corporation Common Stockholders	'
	6. Net income (loss) per share attributable to NeoPhotonics Corporation common stockholders
	The following table sets forth the computation of the basic and diluted loss per share attributable to NeoPhotonics Corporation common stockholders for the periods indicated (in thousands, except share and per share amounts):
		Years ended December 31,
		2013			2012			2011
	Numerator:
	Loss from continuing operations	$	(34,339	)	$	(17,672	)	$	(15,390	)
	Less: Accretion of redeemable convertible preferred stock		—			—			(7	)
	Less: deemed dividend on beneficial conversion of Series X redeemable convertible preferred stock		—			—			(17,049	)
	Loss from continuing operations attributable to NeoPhotonics Corporation common stockholders		(34,339	)		(17,672	)		(32,446	)
	Income from discontinued operations		—			142			636
	Loss attributable to NeoPhotonics Corporation common stockholders	$	(34,339	)	$	(17,530	)	$	(31,810	)
	Denominator:
	Weighted average shares used to compute basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders		31,000,325			28,529,849			22,359,802
	Basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders:
	Continuing operations	$	(1.11	)	$	(0.62	)	$	(1.45	)
	Discontinued operations	$	—		$	—		$	0.03
	Net income (loss)	$	(1.11	)	$	(0.62	)	$	(1.42	)
	The Company has excluded the impact of outstanding employee stock options, restricted stock units, common stock warrants and shares expected to be issued under its employee stock purchase plan from the computation of diluted net loss per share attributable to NeoPhotonics Corporation common stockholders, as their effect would have been antidilutive. The shares potentially issuable for each of these outstanding awards at December 31, 2013, 2012 and 2011 were as follows:
		December 31,
		2013			2012			2011
	Employee stock options		4,103,454			2,773,887			2,631,524
	Restricted stock units		1,169,649			924,823			517,445
	Employee stock purchase plan		403,329			475,592			505,324
	Common stock warrants		4,482			4,482			4,482
			5,680,914			4,178,784			3,658,775

Business_Combination

Business Combination	12 Months Ended
	Dec. 31, 2013
Business Combination	'
	7. Business Combinations
	Acquisition of NeoPhotonics Semiconductor
	On March 29, 2013 (the “closing date”) the Company acquired certain assets and assumed certain liabilities related to the semiconductor Optical Components Business Unit (the “OCU”) of LAPIS Semiconductor Co., Ltd., a wholly owned subsidiary of Rohm Co., Ltd (“LAPIS”) of Japan with the intention of operating the OCU as an ongoing business. The business is now known as NeoPhotonics Semiconductor. NeoPhotonics Semiconductor is a leader in high speed semiconductor and high speed laser and photodetector devices for communications networks. The Company believes the acquisition will expand the Company’s solutions for high speed telecom and datacom applications and strengthen the Company’s customer base in Japan.
	Total consideration for NeoPhotonics Semiconductor was approximately $24.3 million, including cash of $13.1 million and notes payable of $11.1 million. The cash of $13.1 million includes $2.0 million that was withheld and placed into escrow to cover certain indemnity obligations. The notes payable of $11.1 million are to be paid in three equal installments on the first, second and third anniversaries of the closing date. Each year an additional amount calculated as 1.5% per year of the unpaid balance of the notes becomes due. LAPIS retains a lien on the land and building sold until the third payment is paid. The notes payable to LAPIS are denominated in Japanese Yen.
	In connection with the acquisition, the Company incurred approximately $5.4 million in acquisition-related costs related to investment banking, legal, accounting and other professional services and transfer taxes related to real property acquired. The acquisition costs were expensed as incurred and are included in operating expenses in the Company’s 2013 consolidated statement of operations.
	The results of operations of NeoPhotonics Semiconductor and the estimated fair values of the assets acquired and liabilities assumed have been included in the Company’s consolidated financial statements since the date of the acquisition. For the year ended December 31, 2013, NeoPhotonics Semiconductor‘s contribution to total revenues was $40.4 million. The portion of total expenses and net loss associated with NeoPhotonics Semiconductor cannot be separately identified due to the integration with the Company’s operations.
	The Company accounted for its acquisition of the NeoPhotonics Semiconductor assets and assumed liabilities as a business combination. NeoPhotonics Semiconductor’s tangible and identifiable intangible assets acquired and liabilities assumed were recorded based upon their estimated fair values as of the closing date of the acquisition. The estimated fair values of the identifiable assets acquired and liabilities assumed approximated the purchase price; therefore, no goodwill was recorded. The following table summarizes the acquisition accounting and the tangible and intangible assets acquired as of the date of acquisition and subsequent adjustments (in thousands):
	Total purchase consideration:
	Cash paid	$	13,128
	Notes payable		11,130
		$	24,258
	Liabilities assumed:
	Pension and retirement obligations	$	6,471
	Other compensation-related liabilities		1,083
	Other current liabilities		1,265
		$	8,819
	Fair value of assets acquired:
	Inventory	$	13,309
	Other current assets		35
	Land, property, plant and equipment		14,433
	Intangible assets acquired:
	Developed technology		2,120
	Customer relationships		3,180
		$	33,077
	The approach for measuring the fair value of the assets acquired and liabilities assumed is described below:
	Net Tangible Assets
	NeoPhotonics Semiconductor’s tangible assets acquired and liabilities assumed as of March 29, 2013 were recorded at estimated fair value. The Company estimated fair value by adjusting NeoPhotonics Semiconductor’s historical value of property, plant and equipment to an estimate of depreciated replacement cost, adjusted for economic obsolescence. The Company depreciates property, plant and equipment over estimated lives of 2 to 20 years, and records the expense to cost of goods sold and operating expense. The fair value of inventory acquired was determined using a net realizable value approach based upon the expected sales value of the inventory, less any costs to complete and selling costs along with a reasonable profit margin based on historical and expected results.
	Intangible Assets
	Developed technology represents products that have reached technological feasibility. NeoPhotonics Semiconductor’s current product offerings include high speed semiconductor and high speed laser and photodetector devices for communication networks. The fair value of developed technology intangibles acquired was determined by using a royalty-avoidance method. The share of future revenue relating to current technology was forecasted, using an estimate for obsolescence such that the share declines over time. A royalty rate of two percent was used to calculate royalty savings on that revenue that are avoided since the Company owns the technology and does not need to license it from other parties. The after-tax royalty savings was then discounted to present value using the Company’s discount rate. The Company amortizes the developed technology intangible assets over estimated lives of 4 to 5 years, and amortization expense is recorded to cost of goods sold.
	The customer relationships asset represents the value of the ability to sell existing, in-process, and future versions of the technology to the NeoPhotonics Semiconductor existing customer base. The Company utilized the excess earnings method, estimating future cash flows that will result from existing customers given assumed retention rates, and then discounting those flows to their present value using the Company’s discount rate. The Company amortizes the customer relationships intangible asset over an average estimated life of 6 years, and amortization expense is recorded to operating expenses.
	The weighted average amortization period for the total intangible assets acquired is 5.4 years.
	The following unaudited supplemental pro forma information presents the combined results of operations of NeoPhotonics Corporation and NeoPhotonics Semiconductor for the years ended December 31, 2013 and 2012 as if the NeoPhotonics Semiconductor acquisition had been completed at the beginning of 2012. The pro forma financial information includes adjustments related to one time charges, amortization of fair value adjustments and elimination of NeoPhotonics Semiconductor’s revenues and cost of goods sold from its sales to the Company prior to the acquisition. As a result of the elimination adjustments, revenues were reduced by $1.9 million and $4.4 million for 2013 and 2012, respectively, and cost of goods sold was reduced by $1.8 million and $3.9 million for 2013 and 2012, respectively. The pro forma financial information for 2013 also included elimination of $5.4 million in transaction costs and cost of goods sold was decreased by $3.2 million and increased by $4.3 million for 2013 and 2012, respectively, due to a change in the value of inventory as a result of acquisition accounting.
	The unaudited pro forma results do not assume any operating efficiencies as a result of the consolidation of operations (in thousands, except per share data):
		Year ended December 31,
		2013			2012
	Revenue	$	294,933		$	305,286
	Net loss	$	(23,340	)	$	(11,014	)
	Basic and diluted net loss per share	$	(0.75	)	$	(0.39	)
	The unaudited pro forma financial information is presented for informational purposes only and is not indicative of the results of operations that would have been achieved had the acquisition taken place at the beginning of the period presented, nor does it intend to be a projection of future results.
	Acquisition of Santur
	In 2011, the Company acquired Santur, a leading designer and manufacturer of Indium Phosphide (InP)-based PIC products, for total cash consideration of $44.4 million, including $6.0 million that was withheld and placed into escrow to cover certain indemnity obligations. In addition, the sellers were entitled to receive up to $7.5 million based on Santur’s quarterly gross profit during 2012 (see Note 13).
	The Company accounted for its acquisition of Santur as a business combination. Santur’s tangible and identifiable intangible assets acquired and liabilities assumed were recorded based upon their estimated fair values as of the closing date of the acquisition. The excess purchase price over the value of the net assets acquired was recorded as goodwill. The following table summarizes the purchase accounting and the net tangible assets acquired as of the date of acquisition (in thousands):
	Total purchase consideration:
	Cash transferred upon closing	$	44,396
	Fair value of contingent consideration		2,800
			47,196
	Less the fair value of net assets acquired:
	Net tangible assets acquired		21,243
	Intangible assets acquired:
	Developed technology		11,800
	Customer relationships		5,000
	In-process research and development		370
			38,413
	Goodwill	$	8,783
	Details of the net assets acquired are as follows (in thousands):
	Cash and cash equivalents	$	5,410
	Accounts receivable, net		10,253
	Inventories		7,578
	Prepaid and other current assets.		1,329
	Property, plant and equipment		13,500
	Other non-current assets		453
	Accounts payable		(8,371	)
	Other accrued liabilities		(8,798	)
Lease obligation		(111	)
Total net tangible assets acquired	$	21,243
The adjustments to measure the assets acquired and liabilities assumed at fair value are described below:
Net Tangible Assets
Santur’s tangible assets acquired and liabilities assumed as of October 12, 2011 were recorded at estimated fair value. The Company increased Santur’s historical value of fixed assets by $5.8 million to adjust the fixed assets to an amount equivalent to the fair market value. The fair value of fixed assets acquired was determined using several approaches depending on the nature of the fixed asset including a market approach and cost approach if market data was not available. The Company also increased Santur’s cost of inventory by $0.2 million. The fair value of inventory acquired was determined using an income approach based upon the expected sales value of the inventory, less direct costs associated with the sale of the inventory and an allocation of profit margins between the buyer and seller.
Intangible Assets
Developed technology represents products that have reached technological feasibility. Santur’s current products offerings include tunable lasers and transmitters, integrated tunable laser assemblies with narrow line width, and a family of PIC products that enable high capacity 40Gbps and 100Gbps transceivers. The fair value of developed technology intangibles acquired was determined using an income approach called the multi-period excess-earnings method, which involves forecasting the net earnings to be generated by the asset, reducing them by appropriate returns on contributory assets, and then discounting the resulting net returns to a present value using the Company’s discount rate. The Company amortizes the developed technology intangible asset over an average estimated life of 5 years and amortization expense is recorded to cost of goods sold.
Customer relationships represent the value placed on Santur’s distribution channels and end users. The fair value of customer relationship intangibles were determined based on the incremental cash flow afforded by having the customer relationships in place on the acquisition date versus having no relationships in place and needing to replicate or replace those relationships. The Company amortizes the customer relationships intangible asset over an average estimated life of 5 years and amortization expense is recorded to operating expenses.
In-process research and development represents four Santur research and development projects that had not reached technological feasibility as of the closing date of the acquisition. Acquired in-process research and development was recorded at fair value as an indefinite-lived intangible asset at the acquisition date until the completion or abandonment of the associated research and development efforts. The fair value of in-process research and development, similar to developed technology intangibles acquired, was determined using an income approach called the multi-period excess-earnings approach, with the additional inclusion of estimated costs required to complete the projects. These projects were completed in 2012. The Company amortizes the assets over an average estimated life of 5 years and amortization expense is recorded to cost of goods sold.
Goodwill
Goodwill represents the excess of the purchase price over the fair value of the underlying net tangible and identifiable intangible assets, and represents the assembled workforce, the ability to generate new products and services as a combined company and expected synergistic benefits of the transaction. In accordance with applicable accounting standards, goodwill is not amortized but instead is tested for impairment at least annually or, more frequently if certain indicators are present.
Santur’s results of operations from October 12, 2011 through December 31, 2011 were included in the Company’s consolidated statement of operations for the year ended December 31, 2011. During the year ended December 31, 2011, Santur contributed $5.8 million of revenue and $13.8 million of operating loss, which included the impact from purchase accounting related adjustments, such as the amortization of purchased intangibles, amortization of acquisition related fixed asset and inventory step-up, adjustment to the fair value of contingent consideration, retention expense, and acquisition related costs. The following table presents pro forma results of operations of the Company and Santur, as if the companies had been combined as of the beginning of 2011. The unaudited pro forma results of operations are not necessarily indicative of results that would have occurred had the acquisition taken place on January 1, 2011, or of future results. Pro-forma results include: (i) amortization of intangible assets related to the acquisition, (ii) depreciation expense associated with the fair value adjustment to Santur’s property, plant and equipment, (iii) stock-based compensation expense, and (iv) interest income (expense) associated with Santur’s debt eliminated in connection with the acquisition. The pro forma information for the year ended December 31, 2011 is as follows (in thousands, except per share amounts):
Total revenues	$	236,449
Net loss		(29,352	)
Net loss attributable to NeoPhotonics Corporation		(29,352	)
Net loss attributable to NeoPhotonics Corporation common stockholders		(46,408	)
Basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders		(2.08	)

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Purchased Intangible Assets	'
	8. Goodwill and purchased intangible assets
	Goodwill
	In the fourth quarter of 2011, the Company recognized a goodwill impairment charge of $13.1 million. As a result, the Company does not have any goodwill on its consolidated balance sheets as of December 31, 2013 or 2012.
	Both an income and market approach were used to estimate the fair value of the reporting unit. For the income approach, the Company used a discounted cash flow analysis, which included assumptions about future revenue, operating expenses, taxes and working capital and capital asset requirements. Material assumptions used for the income approach were eleven years of projected net cash flows, a discount rate of 18%, and a long-term growth rate of 5%. For the market approach, the Company used a market capitalization analysis, guideline public company analysis and a guideline transactions analysis. The market capitalization approach used the mid-point of the range of closing share prices of the Company’s common stock as of the valuation date and for the three months prior to the valuation date and applied a 40% control premium. The guideline public company analysis measured the enterprise value of eleven companies and also applied a 40% control premium. The guideline transactions analysis looked at thirteen transactions in the optical components industry over the last 3.5 years.
	The resulting analyses were weighted as follows in measuring the fair value of the reporting unit:
	Discounted cash flow		16.7	%
	Market capitalization		50	%
	Guideline public company		16.7	%
	Guideline transactions		16.7	%
	The market capitalization analysis was weighted higher than the other approaches, as the Company believes that the value indication provided by the market is highly relevant to the valuation of the reporting unit.
	Purchased intangible assets
	Purchased intangible assets consist of the following (in thousands):
		December 31, 2013								December 31, 2012
		Gross			Accumulated			Net		Gross		Accumulated			Net
		Assets			Amortization			Assets		Assets		Amortization			Assets
	Technology and patents	$	34,524		$	(25,931	)	$	8,593	$	32,176	$	(22,869	)	$	9,307
	Customer relationships		15,004			(9,732	)		5,272		11,898		(8,148	)		3,750
	Leasehold interest		1,406			(266	)		1,140		1,355		(241	)		1,114
	Non-compete agreements		950			(950	)		—		950		(908	)		42
		$	51,884		$	(36,879	)	$	15,005	$	46,379	$	(32,166	)	$	14,213
	Amortization expense relating to technology and patents and the leasehold interest intangible assets is included within cost of goods sold, and customer relationships and the non-compete agreements within operating expenses. The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the consolidated statements of operations (in thousands):
		Years ended December 31,
		2013			2012			2011
	Cost of goods sold	$	2,543		$	2,472		$	598
	Operating expenses		1,532			1,316			994
	Total	$	4,075		$	3,788		$	1,592
	The estimated future amortization expense of purchased intangible assets as of December 31, 2013, is as follows (in thousands):
	2014	$	4,402
	2015		4,386
	2016		3,640
	2017		793
	2018		580
	Thereafter		1,204
		$	15,005

Balance_Sheet_Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2013
Balance Sheet Components	'
	9. Balance sheet components
	Accounts receivable, net
	Accounts receivable, net consists of the following (in thousands):
		December 31,
		2013			2012
	Accounts receivable	$	57,010		$	66,338
	Trade notes receivable		8,054			4,979
	Allowance for doubtful accounts		(531	)		(963	)
		$	64,533		$	70,354
	The table below summarizes the movement in the Company’s allowance for doubtful accounts (in thousands):
	Balance at December 31, 2010	$	(1,582	)
	Provision for bad debt		(196	)
	Write-offs, net of recoveries		1,272
	Balance at December 31, 2011		(506	)
	Provision for bad debt		(457	)
	Write-offs, net of recoveries		—
	Balance at December 31, 2012		(963	)
	Provision for bad debt		253
	Write-offs, net of recoveries		179
	Balance at December 31, 2013	$	(531	)
	Inventories
	Inventories consist of the following (in thousands):
		December 31,
		2013			2012
	Raw materials	$	26,379		$	19,038
	Work in process		14,341			8,940
	Finished goods		24,188			15,815
		$	64,908		$	43,793
	Included in finished goods was $5.4 million and $4.5 million of inventory at customer vendor managed inventory locations at December 31, 2013 and 2012, respectively.
	Property, plant and equipment, net
	Property, plant and equipment, net consist of the following (in thousands):
		December 31,
		2013			2012
	Land	$	3,167		$	—
	Buildings		23,194			16,484
	Machinery and equipment		104,287			92,139
	Furniture, fixtures, software and office equipment		11,441			8,300
	Leasehold improvements		7,837			4,373
			149,926			121,296
	Less: Accumulated depreciation		(81,075	)		(66,856	)
		$	68,851		$	54,440
	Depreciation expense was $16.3 million, $12.4 million and $10.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Accrued and other current liabilities
	Accrued and other current liabilities consist of the following (in thousands):
		December 31,
		2013			2012
	Employee-related	$	12,297		$	12,293
	Other		11,346			7,666
		$	23,643		$	19,959
	Accrued warranty
	The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands):
		Years ended December 31,
		2013			2012			2011
	Beginning balance	$	1,072		$	1,443		$	299
	Warranty accruals		1,514			385			393
	Assumed warranty from acquisitions		135			—			999
	Settlements and adjustments		(984	)		(756	)		(248	)
	Ending balance	$	1,737		$	1,072		$	1,443	-1
	-1	Included within the ending balance is an accrual of $0.3 million relating to a specific part, for which the liability was assumed as part of the acquisition of Santur. The Company did not experience any claims for this product after October 2011 and it believed warranty claims were remote. Therefore, the Company released this obligation in the fourth quarter of 2012.
	Other noncurrent liabilities
	Other noncurrent liabilities consist of the following (in thousands):
			December 31,
			2013			2012
Pension and other employee-related		$	6,206		$	188
Penalty payment derivative			239			138
Other			1,542			1,536
		$	7,987		$	1,862

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2013
Restructuring	'
	10. Restructuring
	During 2013, the Company exited and closed one facility at its headquarters location to align its facilities usage with its current size. Additionally, the Company approved and implemented a restructuring action to reduce its workforce and close a facility in China and to exit its contract manufacturing activities in Malaysia. The Company recorded a restructuring charge of $1.5 million during 2013 related to these actions, of which $0.8 million was recorded in operating expenses with the remainder recorded in cost of goods sold. The remaining balance related to facilities will be paid through 2015.
	The following table summarizes activity associated with the restructuring during the year ended December 31, 2013 (in thousands):
		Severance			Facilities			Contract			Total
								Termination
	Restructuring obligations, December 31, 2012	$	—		$	—		$	—		$	—
	Restructuring costs incurred in 2013		699			318			457			1,474
	Cash payments		(699	)		(178	)		(391	)		(1,268	)
	Non-cash settlements and other		—			71			—			71
	Restructuring obligations, December 31, 2013	$	—		$	211		$	66		$	277
	During the fourth quarter of 2011, the Company approved and implemented a restructuring plan, which resulted in the involuntary termination of 37 employees in the U.S. and 43 employees in China. The reduction in workforce was primarily related to cost-cutting measures in research and development. In addition, the Company made reductions in the areas of sales, marketing and administrative functions as a result of redundancy in positions due to the acquisition of Santur in October 2011. The Company recorded a restructuring charge of $1.3 million for severance and benefit costs in 2011. As of December 31, 2012 all of the restructuring expense had been paid.

Debt

Debt	12 Months Ended
	Dec. 31, 2013
Debt	'
	11. Debt
	The table below summarizes the carrying amount and weighted average interest rate of the Company’s notes payable and long-term debt (in thousands, except percentages):
		December 31, 2013						December 31, 2012
		Carrying			Weighted			Carrying			Weighted
		Amount			Average			Amount			Average
					Interest						Interest
					Rate						Rate
	Notes payable	$	9,738			—		$	12,003			—
	Long-term debt:
	Acquisition-related	$	9,975			1.5	%	$	—			—
	Bank borrowings		24,500			2.92	%		22,167			2.2	%
			34,475						22,167
	Less: current portion of long-term debt		(10,325	)					(5,000	)
	Total long-term debt, net of current portion	$	24,150					$	17,167
	Notes payable
	The Company frequently issues notes payable to its suppliers in China in exchange for accounts payable. These notes are supported by noninterest bearing bank acceptance drafts and are due three to six months after issuance. As a condition of the notes payable arrangements, the Company is required to keep a compensating balance at the issuing banks that is a percentage of the total notes payable balance until the amounts are settled. These balances are classified as restricted cash on the Company’s consolidated balance sheets. As of December 31, 2013 and 2012, restricted cash totaled $2.1 million and $2.6 million, respectively. In May 2014, one of the Company’s subsidiaries in China issued a 90-day bank acceptance draft of approximately $8.0 million to another of the Company’s subsidiaries that required a compensating balance of approximately $2.4 million.  This bank acceptance draft can be sold for cash at a discount prior to its expiration.
	At December 31, 2013, the Company’s subsidiaries in China had two short-term line of credit facilities with banking institutions. Amounts requested by the Company were not guaranteed and were subject to the banks’ funds and currency availability. The Company had no amount outstanding under these facilities at December 31, 2013 or 2012. As of June 3, 2014, both credit facilities had expired and were in the process of being renewed.
	Acquisition-related
	In connection with the acquisition of NeoPhotonics Semiconductor on March 29, 2013, the Company is obligated to pay 1,050 million Japanese Yen in three equal installments on the first, second and third anniversaries of the closing date for the purchase of the real estate used by NeoPhotonics Semiconductor. The obligation bears interest at 1.5% per year and the acquired real estate property is security for the loan from LAPIS.
	Bank borrowings
	The Company has a credit agreement with Comerica Bank in the U.S., which has been amended several times. In March 2013, the Company amended and restated its credit agreement in its entirety. The components of the available credit facilities are as follows:
	—	A revolving credit facility under which there was nothing outstanding and $20.0 million available for borrowing at December 31, 2013, subject to covenant requirements. There was $8.0 million outstanding under this line at December 31, 2012. Amounts borrowed are due on or before March 2016 and borrowings bear interest at an interest rate option of a base rate as defined in the agreement plus 1.5% or LIBOR plus 2.5%. As of December 31, 2013 the rate on the LIBOR option was 2.67%.
	—	A term loan facility of $28.0 million, under which $24.5 million was outstanding at December 31, 2013. Interest is payable quarterly in arrears and the principal is paid in equal quarterly installments over the term of the loan ending in June 2017. Borrowings under the term loan bear interest at an interest rate option of a base rate as defined in the agreement plus 1.75% or LIBOR plus 2.75%. As of December 31, 2013 the rate on the LIBOR option was 2.92%
	Additionally, as of December 31, 2012, there was $14.2 million outstanding under an acquisition advance facility under the previous agreement, which bore interest at a rate of LIBOR plus 2%.
	In connection with the credit agreement, the Company issued a warrant to the lender to purchase 4,482 shares of common stock at an exercise price of $29.00 per share. As of December 31, 2013, the warrant had not been exercised.
	The Company’s credit agreement requires the maintenance of specified financial covenants, including a debt to EBITDA ratio and liquidity ratios.  The agreement also restricts the Company’s ability to incur additional debt or to engage in specified transactions, restricts the payment of dividends and is secured by substantially all of its U.S. assets, other than intellectual property assets. The Company was not in compliance with the debt to EBITDA covenant at December 31, 2013 and obtained a waiver from the bank with respect to such noncompliance.
	The Company executed a series of amendments to its credit agreement through April 2014 that modified certain covenants and extended the delivery date of certain of its Quarterly Reports on Form 10-Q and this Annual Report on Form 10-K. The amendments also increased the applicable interest margins by 0.25% per annum. Loans under the term loan facility bear interest equal to either the LIBOR rate, plus an applicable margin equal to 3.00% per annum, or a base rate (as defined) plus an applicable margin equal to 2.00% per annum. Loans under the revolving loan facility bear interest at a rate equal to either the LIBOR rate, plus an applicable margin equal to 2.75% per annum, or a base rate (as defined) plus an applicable margin equal to 1.75% per annum. These new interest rate options will be in effect at least until the lender’s review of the Company’s June 30, 2014 financial statements.
	On May 19, 2014 the Company executed an amendment to the credit agreement that waived testing of certain covenants for compliance, including the debt to EBITDA covenant, provided that the Company maintain compensating balances equal to outstanding amounts under the credit agreement in accounts for which the bank will have sole access.  The Company intends to work with the bank in the coming months to restructure the credit agreement, including the covenant requirements.  In the absence of a restructured agreement, the Company believes it will need to continue to maintain the compensating balances at least through the end of 2014. As of May 19, 2014, the amount of the Company’s cash and short-term investments in these compensating balance accounts was $21.1 million.
	At December 31, 2013, maturities of long-term debt were as follows (in thousands):
	2014	$	10,325
	2015		10,325
	2016		10,325
	2017		3,500
		$	34,475

Japan_Defined_Benefit_Pension_

Japan Defined Benefit Pension Plans	12 Months Ended
	Dec. 31, 2013
Japan Defined Benefit Pension Plans	'
	12. Japan defined benefit pension plans
	In connection with its acquisition of NeoPhotonics Semiconductor on March 29, 2013, the Company assumed responsibility for two defined benefit plans that provide retirement benefits to its NeoPhotonics Semiconductor employees in Japan: the Retirement Allowance Plan (“RAP”) and the Defined Benefit Corporate Pension Plan (“DBCPP”). The RAP is an unfunded plan administered by the Company.  The benefits are calculated based on the accumulation of points, years of service and mode of exit.  Lump sum benefits are provided upon retirement or upon certain instances of termination.  The DBCPP is a funded defined benefit plan sponsored by LAPIS in which the Company has participated.  The benefits are calculated based on the accumulation of points, interest and years of service.  Lump sum or annuity benefits are provided upon retirement or upon certain instances of termination.
	The DBCPP plan assets are currently held by LAPIS.  Effective February 28, 2014, the DBCPP was converted to a defined contribution plan (“DCP”).  LAPIS will transfer approximately $2.0 million into the newly formed DCP which is the allowable amount that can be transferred according to the Japanese regulations.   This $2.0 million is the amount reflected as the plan assets at December 31, 2013 in the table below.  Additionally, LAPIS will pay the Company approximately $0.3 million in connection with the conversion of the plan, which the Company has included in prepaid expenses and other current assets at December 31, 2013.  The net unfunded projected benefit obligation amount in the DBCPP at the date of conversion will be transferred to the RAP.
	The funded status of these plans for the period from March 29, 2013 to December 31, 2013 was as follows (in thousands):
			RAP			DBCPP
	Change in projected benefit obligation:
	Projected benefit obligation, March 29, 2013	$	5,795		$	2,706
	Service cost		175			78
	Interest cost		39			18
	Benefits paid		(140	)		—
	Actuarial (gain)/loss		177			(14	)
	Currency translation adjustment		(600	)		(280	)
	Projected benefit obligation, end of period	$	5,446		$	2,508
	Change in plan assets:
	Plan assets at fair value, March 29, 2013	$	—		$	2,037
	Employer contributions		—			585
	Actual return on plan assets		—			(304	)
	Currency translation adjustment		—			(246	)
	Plan assets at calculated amount, end of period	$	—		$	2,072
	Amounts recognized in consolidated balance sheets:
	Accrued and other current liabilities	$	115		$	—
	Other noncurrent liabilities	$	5,331		$	436
	Amount recognized in accumulated other comprehensive loss:
	Defined benefit pension plans adjustment	$	177		$	319
	Accumulated benefit obligation, end of period	$	4,929		$	2,508
	Net periodic pension cost associated with these plans for the period from March 29, 2013 to December 31, 2013 included the following components (in thousands):
			RAP			DBCPP
	Service cost	$	175		$	78
	Interest cost		39			18
	Expected return on plan assets		—			(30	)
	Net periodic pension costs	$	214		$	66
	The projected and accumulated benefit obligations for the plans were calculated as of December 31, 2013 using the following assumptions:
			RAP			DBCPP
	Discount rate		0.7	%		1.6	%
	Expected return on plan assets		—	%		1.7	%
	Salary increase rate		4.5	%		1.2	%
	The expected return on plan assets was based on the historical return on assets similar to those held in the LAPIS plan.
	Estimated future benefit payments under the plans are as follows (in thousands):
			RAP			DBCPP
	2014	$	115		$	85
	2015		126			12
	2016		553			19
	2017		433			30
	2018		634			43
	2019 - 2023		2,456			414
		$	4,317		$	603
	The Company contributed approximately $15,000 to the DBCPP from January 1, 2014 to February 28, 2014.  Because the DBCPP transitioned to the DCP on that date, no further contributions to the DBCPP are required.
	In addition to the conversion of the DBCPP to the DCP, the Company made certain changes to the RAP benefit formula and will transfer the net unfunded projected benefit obligation amount from the DBCPP to the RAP at the date of conversion.  As a result of these changes, the Company expects to record a curtailment gain of approximately $0.1 million in the quarter ended March 31, 2014.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies	'
	13. Commitments and contingencies
	Leases
	The Company leases various facilities under non-cancelable operating leases. As of December 31, 2013, the future minimum commitments under all operating leases are as follows (in thousands):
	Years ending December 31,
	2014	$	1,756
	2015		1,343
	2016		744
	2017		500
	2018		520
	Thereafter		447
		$	5,310
	The Company recognizes rent expense on a straight-line basis over the lease period. Rent expense under the Company’s operating leases was $2.2 million, $2.3 million and $1.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	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 more likely than not that the case will be ruled against us. If a legal claim for which the Company did not accrue is resolved against us, the Company would record the expense in the period in which the ruling was made. The Company currently does not believe that the ultimate amount of liability, if any, for any pending claims of any type (alone or combined) will materially affect our financial position, results of operations or cash flows. The ultimate outcome of any litigation is uncertain, however, and unfavorable outcomes could have a material negative impact on its financial condition and operating results.
	On January 5, 2010, Finisar Corporation, or 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 arising from the codefendants’ respective manufacture, importation, use, sale of or offer to sell certain optical transceiver products. On March 23, 2010, the Company filed an answer to the complaint and counterclaims, asserting two claims of patent infringement and additional claims asserting that Finisar has violated state and federal competition laws and violated its obligations to license on reasonable and non-discriminatory terms. On May 5, 2010, the court dismissed without prejudice all co-defendants (including the Company) except Source Photonics, Inc., on grounds that such claims should have been asserted in four separate lawsuits, one against each defendant. This dismissal without prejudice does not prevent Finisar from bringing a new similar lawsuit against the Company. On January 18, 2011, the Company and Finisar agreed to suspend their respective claims and not to refile the originally asserted claims against each other until at least 90 days after one or more specified events occur resulting in the partial or complete resolution of litigation involving the same Finisar patents between Oplink Communications, Inc. and Finisar. This tolling period expired on April 30, 2012. On May 3, 2012 the Company and Finisar agreed to further toll their respective claims until the refiling of certain of the previously asserted claims from this dispute. As a result, Finisar is permitted to bring a new lawsuit against the Company if it chooses to do so, and the Company may bring new claims against Finisar upon seven days written notice prior to filing such claims. The Company is currently unable to predict the outcome of this dispute and therefore cannot determine the likelihood of loss nor estimate a range of possible loss.
	Indemnifications
	In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations. As of December 31, 2013, the Company does not have any material indemnification claims that were probable or reasonably possible.
	Purchase obligations
	The Company has open purchase orders with its suppliers for the purchase of inventory and other items in the ordinary course of its business. As of December 31, 2013, the Company’s estimate of outstanding amounts under these purchase orders was approximately $40.0 million, primarily expected to be purchased within the next 12 months.
	Settlement with Santur
	In May 2014, the Company entered into a settlement agreement covering the outstanding claims in connection with its 2011 acquisition of Santur. Under the terms of the settlement agreement, a net amount of $1.9 million was paid to the Company from the escrow account that was set up under the original merger agreement. This amount comprises $3.9 million related to certain indemnification claims by the Company (“Indemnification Amount”) which were partially offset by $2.0 million related to additional consideration for the business acquisition that was contingent upon Santur’s gross profit performance during 2012 (“Contingent Consideration Amount”). Prior to this Settlement, the Company had recorded $1.0 million as its estimated fair value of the Contingent Consideration Amount. As a result of this settlement, the Company recorded an additional $1.0 million in its operating expenses for the year ended December 31, 2013 to adjust the fair value of the Contingent Consideration Amount to the full $2.0 million settlement amount. Because it is considered to be a contingent gain, the $3.9 million Indemnification Amount will not be recognized until the quarter ended June 30, 2014.
	The fair value of the Contingent Consideration Amount was originally measured at the date of acquisition in 2011 and was re-measured each reporting period with any changes in the fair value recognized as a gain or loss in the consolidated statements of operations. The Contingent Consideration Amount was valued with level three inputs. Prior to the settlement, the fair value of this liability was estimated using the expected cash flow approach with inputs being probability-weighted revenue and gross margin projections and a discount rate based on a weighted-average cost of capital. As of December 31, 2013, 2012 and 2011, the fair value of the contingent consideration was $2.0 million, $1.0 million and $1.5 million, respectively.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity	'
	14. Stockholders’ Equity
	Common stock
	As of December 31, 2013, the Company had reserved the following shares of authorized but unissued common stock:
	Stock option plans		6,069,781
	Stock purchase plans		369,878
	Warrants		4,482
			6,444,141
	Initial Public Offering
	In February 2011, the Company completed its initial public offering of 8,625,000 shares of its common stock, including the full underwriters’ over-allotment option, at a public offering price of $11.00 per share. Net cash proceeds from the initial public offering were approximately $88.2 million, prior to deducting offering expenses.
	In connection with the closing of the initial public offering, all of the shares of Series 1, Series 2 and Series 3 preferred stock outstanding automatically converted into 6,639,513 shares of common stock on a 1-for-1 basis and all of the shares of Series X preferred stock outstanding automatically converted into 7,398,976 shares of common stock on a 400-for-1 basis.
	Private Sale of Common Stock
	On April 27, 2012, the Company issued and sold approximately 4.97 million shares of its common stock in a private placement transaction at a price of $8.00 per share for a gross amount of approximately $39.8 million.
	The shares of common stock are restricted from transfer pursuant to a lockup agreement for up to two years, at the end of which the Company is obligated to file one or more registration statements covering the potential resale of the shares of common stock.
	In connection with this private placement transaction, the Company agreed to certain performance obligations including establishing a wholly-owned subsidiary in Russia and making a $30.0 million investment commitment (the ‘Investment Obligation’) towards the Company’s Russian operations. The Investment Obligation can be partially satisfied by investment outside of the Russian Federation and/or by way of non-cash asset transfers, including but not limited to capital equipment, small tools, intellectual property, and other intangibles. A minimum of $15.0 million of the Investment Obligation is required to be satisfied by making capital expenditures and the remaining $15.0 million can be satisfied through general working capital and research and development expenditures. All of the amount for general working capital can be spent either inside or outside of Russia. However, at least 80% of the amount expended for research and development expenditure must be spent inside Russia. General working capital can include acquisition of other businesses or portions thereof to be owned by the Russian subsidiary.
	The purchaser of the common stock has non-transferable veto rights over the Company’s Russian subsidiary’s annual budget during the investment period and must approve non-cash asset transfers to be made in satisfaction of the Investment Obligation. Spending and/or commitments to spend for general working capital and research and development do not require approval by the purchaser. There are no legal restrictions on the specific usage of the $39.8 million received in the private placement transaction or on withdrawal from the Company’s bank accounts for use in general corporate purposes.
	The Company is required to satisfy the Investment Obligation by July 31, 2014 or, in the event the Company has not recorded aggregate revenue from sales of its products in the Russian Federation of at least $26.8 million during the period beginning July 1, 2012 and ending June 30, 2014, then will be automatically extended from July 31, 2014 to March 31, 2015. The Company expects the date for achievement of the Investment Obligation will be extended to March 31, 2015. Therefore, the Company intends to meet its Investment Obligation by March 31, 2015. If the Company fails to meet the Investment Obligation by the deadline, including failure to meet the Investment Obligation because the purchaser of the common stock does not approve the transfer of non-cash assets, the Company will be required to pay a $5.0 million penalty (the ‘Penalty Payment’) as the sole and exclusive remedy for damages and monetary relief available to the purchaser for failure to meet the Investment Obligation.
	The Company has accounted for the $5.0 million Penalty Payment as an embedded derivative instrument, with the underlying being the performance or nonperformance of meeting the Investment Obligation by the extended deadline of March 31, 2015 and has classified $4.9 million of the $5.0 million as additional paid-in capital and the remaining $0.1 million, representing the estimated fair value of the Penalty Payment derivative, in other noncurrent liabilities.
	The fair value of the Penalty Payment derivative has been estimated at the date of the original common stock sale (April 27, 2012) and at each subsequent balance sheet date using a probability-weighted discounted future cash flow approach using unobservable inputs, which are classified as Level 3 within the fair value hierarchy. The primary inputs for this approach include the probability of achieving the Investment Obligation and a discount rate that approximates the Company’s incremental borrowing rate. After the initial measurement, changes in the fair value of this derivative were recorded in other income (expense). The estimated fair value of this derivative was $0.2 million and $0.1 million at December 31, 2013 and 2012, respectively.
	Accumulated Other Comprehensive Income
	Comprehensive loss consists of two components, net loss and other comprehensive income. Other comprehensive income refers to revenue, expenses, and gains and losses that under GAAP are recorded as an element of stockholders’ equity and are excluded from net income or loss. The Company’s other comprehensive income consists of foreign currency translation adjustments from those subsidiaries not using the U.S. dollar as their functional currency, unrealized gains and losses on marketable securities classified as available-for-sale and certain pension adjustments.
	The following table shows the components of accumulated other comprehensive income, net of taxes, as of December 31, 2013, 2012 and 2011 (in thousands):
		December 31,
		2013			2012		2011
	Foreign currency translation adjustments	$	11,802		$	11,761	$	11,660
	Unrealized gains/losses on available-for-sale securities		3			68		(307	)
	Defined benefit pension plan adjustment		(118	)		—		—
		$	11,687		$	11,829	$	11,353
	Accumulated Deficit
	Approximately $6.5 million of the Company’s accumulated deficit at December 31, 2013 was subject to restriction due to the fact that its subsidiaries in China are required to set aside at least 10% of their respective accumulated profits each year to fund statutory common reserves as well as allocate a discretional portion of their after-tax profits to their staff welfare and bonus fund.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2013
Stock-Based Compensation	'
	15. Stock-based compensation
	Equity incentive programs
	2004 Stock Option Plan
	In March 2004, the Company adopted the 2004 Stock Option Plan (the “2004 Plan”) for the benefit of its eligible employees, consultants and independent directors. In February 2011, in connection with the closing of the Company’s initial public offering and execution of the associated underwriting agreement, shares authorized for issuance under the 2004 Plan were cancelled (except for those shares reserved for issuance upon exercise of outstanding stock options). As of December 31, 2013, options to purchase 1,517,048 shares were outstanding under the 2004 Plan and no shares were available for future grant.
	2007 Stock Appreciation Grants Plan
	In October 2007, the Company adopted its 2007 Stock Appreciation Grants Plan (the “2007 Plan”). The 2007 Plan provides for the grant of units (“stock appreciation units”) entitling the holder upon exercise to receive cash in an amount equal to the amount by which the Company’s common stock has appreciated in value. Each stock appreciation unit entitles a participant to a cash payment in the amount of the excess of the fair market value of a share of common stock on the exercise date over the fair market value of a share of common stock on the award date.
	The total appreciation available to a participant from the exercise of an award is equal to the number of stock appreciation units being exercised, multiplied by the amount of appreciation per stock appreciation unit. The stock appreciation units granted under the 2007 Plan were primarily granted to employees or consultants of the Company’s subsidiaries in China.
	The Company re-measures the fair value (based on the market price of the Company’s common stock at the relevant period end) of all vested and outstanding stock appreciation units and adjusts compensation expense and corresponding liability accordingly. The Company also recognizes compensation expense for additional vested stock appreciation units. As of December 31, 2013, 160,397 stock appreciation units were outstanding. The Company does not intend to grant additional stock appreciation units under the 2007 Plan.
	2010 Equity Incentive Plan
	In April 2010, the Company adopted its 2010 Equity Incentive Plan (the “2010 Plan”). The 2010 Plan will terminate on April 13, 2020, unless sooner terminated by the board of directors.
	The 2010 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance-based stock awards, and other forms of equity compensation, or collectively, stock awards, all of which may be granted to employees, including officers, and to non-employee directors and consultants. Additionally, the 2010 Plan provides for the grant of performance-based cash awards. Incentive stock options may be granted only to employees. All other awards may be granted to employees, including officers, and to non-employee directors and consultants.
	Under the terms of the 2010 Plan, awards may be granted at prices not less than 100% of the fair value of the Company’s common stock, as determined by the Company’s board of directors, on the date of grant for an incentive stock option and not less than 85% of the fair value of the Company’s common stock on the date of grant for a non-qualified stock option. Options vest over a period of time as determined by the board of directors, generally over a three to four year period, and expire ten years from date of grant.
	Initially, the aggregate number of shares of the Company’s common stock that may be issued pursuant to stock awards under the 2010 Plan was 865,420 shares. Then, the number of shares of the Company’s common stock reserved for issuance under the 2010 Plan automatically increase on January 1st each year, starting on January 1, 2012 and continuing through January 1, 2020, by 3.5% of the total number of shares of the Company’s common stock outstanding on December 31 of the preceding calendar year, or such lesser number of shares of common stock as determined by the Company’s board of directors. The maximum number of shares that may be issued pursuant to the exercise of incentive stock options under the 2010 Plan is 8,000,000 shares. As of December 31, 2013, stock options to purchase and restricted stock units to convert to a total of 3,358,169 shares of common stock were outstanding under the 2010 Plan and 507,435 shares were reserved for future issuance.
	2010 Employee Stock Purchase Plan
	In February 2011, the Company adopted its 2010 Employee Stock Purchase Plan (the “2010 ESPP”). The 2010 ESPP was implemented through a series of offerings of purchase rights to eligible U.S. employees. The offering period is for 12 months beginning November 16th of each year, with two purchase dates on May 15th and November 15th.   Due to the delay in filing this Annual Report on Form 10-K, in May 2014 the Compensation Committee of the Company’s Board of Directors (the Committee) rescheduled the May 15 purchase date under the current offering period to the date that is three business days after the later of (i) the filing of this Annual Report and (ii) the Company’s general public release of its revenues for the first quarter of 2014.  Additionally, the Committee waived the existing purchase limits for the upcoming purchase date only, creating a modification of the purchase price formula for the current offering period.
	The 2010 ESPP initially authorized the issuance of 342,568 shares of the Company’s common stock pursuant to purchase rights granted to employees or to employees of designated affiliates. The number of shares of common stock reserved for issuance will automatically increase on January 1st of each year, starting January 1, 2012 and continuing through January 1, 2020, in an amount equal to the lesser of (1) 3.5% of the total number of shares of common stock outstanding on December 31st of the preceding calendar year, (2) 600,000 shares of common stock or (3) such lesser number of shares of common stock as determined by the Company’s board of directors. As of December 31, 2013, the Company had 369,878 shares reserved for future issuance. The Company issued 487,856 shares during the year ended December 31, 2013.
	2011 Inducement Award Plan
	In September 2011, the Company adopted its 2011 Inducement Award Plan (the “2011 Plan”). The 2011 Plan provides for awarding options, stock appreciation rights, restricted stock grants, restricted stock units and other awards to new employees of the Company and its affiliates, including as a result of future business acquisitions. All options shall be designated as non-statutory stock options.
	The number of shares reserved for issuance under the 2011 Plan is 750,000 shares. The exercise price of awards shall be not less than 100% of the fair market value of the Company’s common stock on the date of grant. Each stock appreciation right grant will be denominated in shares of common stock equivalents. Options and stock appreciation rights have a maximum term of ten years measured from the date of grant, subject to earlier termination following the individual’s cessation of service with the Company. As of December 31, 2013, stock options to purchase a total of 397,886 shares of common stock were outstanding under the 2011 Plan and 317,472 shares were reserved for future issuance.
	Determining Fair Value
	The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions:
			Years ended December 31,
	Stock options		2013		2012		2011
	Weighted-average expected term (years)		6.49		6.77		6.69
	Weighted-average volatility		74%		72%		71%
	Risk-free interest rate		1.08% – 1.86%		0.99% – 2.70%		1.62% – 2.92%
	Expected dividends		—  %		—  %		—  %
	Stock appreciation units
	Weighted-average expected term (years)		1.9		2.88		3.91
	Weighted-average volatility		58%		68%		74%
	Risk-free interest rate		0.10% – 0.63%		0.21% – 0.63%		0.36% – 2.42%
	Expected dividends		—  %		—  %		—  %
	ESPP
	Weighted-average expected term (years)		0.73		0.75		0.71
	Weighted-average volatility		48%		60%		68%
	Risk-free interest rate		0.09% – 0.16%		0.04% – 0.16%		0.04% – 0.23%
	Expected dividends		—  %		—  %		—  %
	Expected term. The expected term for stock options was estimated using the Company’s historical exercise behavior and expected future exercise behavior. Vested stock appreciation units first became exercisable upon the expiration of the lock-up period associated with the initial public offering. Therefore, the Company estimated the term of the award based on an average of the weighted-average exercise period and the remaining contractual term. The expected term for the ESPP represents the period of time from the beginning of the offering period to the purchase date.
	Volatility. Due to the limited history of the trading of the Company’s common stock since the initial public offering in February 2011, the expected volatility used by the Company is based on volatility of similar entities. In evaluating similarity, factors such as industry, stage of life cycle, size, and financial leverage are taken into consideration. The term over which volatility was measured was commensurate with the expected term.
	Risk-free interest rate. The risk-free rate that the Company uses in the Black-Scholes-Merton option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
	Expected dividends. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	Stock-Based Compensation Expense
	The following table summarizes the stock-based compensation expense recognized for the years ended December 31, 2013, 2012 and 2011 (in thousands)
		Years ended December 31,
		2013				2012			2011
	Cost of goods sold	$	924			$	800		$	503
	Research and development		2,060				1,744			1,033
	Sales and marketing		1,167				934			647
	General and administrative		1,585				1,299			925
		$	5,736			$	4,777		$	3,108
	Stock Option and Restricted Stock Unit Activity
	The following table summarizes the Company’s stock option and restricted stock unit, or RSU, activity during the year ended December 31, 2013:
						Stock Options					Restricted Stock Units
		Shares				Number of			Weighted		Number of			Weighted
		Available				Shares			Average		Units			Average
		for Grant							Exercise					Grant Date
									Price					Fair Value
	Balance at December 31, 2012		382,668				2,773,887		$	5.87		924,823		$	5.84
	Authorized for issuance		2,569,115				—		$	—		—		$	—
	Granted		(2,420,870	)			1,732,130		$	5.92		688,740		$	6.96
	Exercised/Converted		—				(260,604	)	$	4.65		(345,359	)	$	8.26
	Forfeited		265,765				(141,959	)	$	7.35		(98,555	)	$	6.13
	Balance at December 31, 2013		796,678				4,103,454		$	5.92		1,169,649		$	6.42
The following table summarizes information about stock options outstanding as of December 31, 2013:
	Options Outstanding
	Number of				Weighted			Weighted		Aggregate
	Shares				Average			Average		Intrinsic Value
					Exercise			Remaining		(in Thousands)
					Price			Contractual
								Term (Years)
Vested and expected to vest		3,729,782			$	5.94			6.68	$	5,824
Exercisable		1,935,519			$	5.88			4.93	$	3,618
The fair value of options vested during the years ended December 31, 2013, 2012 and 2011 was $1.1 million, $2.1 million and $1.0 million, respectively. The intrinsic value of options vested and expected to vest and exercisable as of December 31, 2013 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of December 31, 2013. The intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011, was $0.7 million, $0.1 million and $0.4 million, respectively.
The weighted-average fair value of options granted was $4.65, $3.33 and $4.15 per share for the years ended December 31, 2013, 2012 and 2011, respectively. At December 31, 2013, there was $7.9 million of unrecognized stock-based compensation expense for stock options that will be recognized over the remaining weighted-average period of 4.4 years.
Included in 2013 grants in the table above are 1.2 million shares of market-based stock options granted to key employees. These options will vest if the average closing price of the Company’s common stock over a period of 20 consecutive trading days is equal to or greater than $15.00 per share and the recipients remain in continuous service with the Company through such period, or fully accelerate and vest in December 2019. The Company estimated the fair value of its market-based options as $4.11-$5.97 for 2013 using a Monte Carlo simulation model with the assumptions discussed above. The Company recorded $0.4 million of compensation expense for these options in 2013.
The following table summarizes information about RSUs outstanding as of December 31, 2013:
	Restricted Stock Units Outstanding
	Number of				Weighted			Weighted		Aggregate
	Shares				Average			Average		Intrinsic Value
					Grant Date			Remaining		(in Thousands)
					Fair Value			Contractual
								Term (Years)
Vested and expected to vest		1,102,383			$	6.42			1.25	$	7,783
The fair value of RSUs vested during the years ended December 31, 2013, 2012 and 2011 was $2.1 million, $1.1 million and $0.0, respectively. The intrinsic value of RSUs vested and expected to vest as of December 31, 2013 is calculated based on the fair value of the Company’s common stock as of December 31, 2013. The intrinsic value of RSUs converted during the years ended December 31, 2013, 2012 and 2011, was $2.9 million, $0.8 million and $0.0 respectively.
The weighted-average fair value of RSUs granted was $6.96 and $5.27 per share for the years ended December 31, 2013 and 2012, respectively. At December 31, 2013, the Company had $5.5 million of unrecognized stock-based compensation expense for RSUs that will be recognized over the remaining weighted-average period of 2.0 years.
The majority of the Company’s RSUs that were converted during the years ended December 31, 2013 and 2012 were net share settled. No RSUs were settled in the year ended December 31, 2011. Upon each settlement date, RSUs were withheld to cover the required withholding tax and the remaining amounts were delivered to the recipient as shares of the Company’s common stock. In 2013 and 2012, the Company withheld 68,390 and 28,229 shares, respectively, which represented the employees’ minimum statutory obligation for income and other employment taxes and remitted cash of $0.6 million and $0.1 million, respectively, to the appropriate tax authorities.
Stock Appreciation Unit Activity
The following table summarizes the Company’s stock appreciation unit activity during the year ended December 31, 2013:
	Stock				Weighted-
	Appreciation				Average
	Units				Exercise
					Price
Stock appreciation units outstanding as of December 31, 2012		212,534			$	7.07
Stock appreciation units granted		275,000			$	5.4
Stock appreciation units exercised		(29,263	)		$	4.36
Stock appreciation units cancelled		(37,874	)		$	7.45
Stock appreciation units outstanding as of December 31, 2013		420,397			$	6.13
The fair value of stock appreciation units vested during the year ended December 31, 2013, 2012 and 2011 was $0.1 million, $0.3 million and $0.1 million, respectively. The intrinsic value of stock appreciation units is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of December 31, 2013. The cash paid for stock appreciation units exercised during the years ended December 31, 2013, 2012 and 2011, was $0.1 million, $0.02 million and $0.02 million, respectively.
Stock appreciation units are re-measured each period at fair value. Due to the contingent nature of the awards prior to the initial public offering, the Company had not recorded any compensation expense associated with these awards. Therefore, in February 2011, the Company recognized compensation expense representing the number of vested stock appreciation units at that date, multiplied by the fair value of the award. Subsequently, the Company recognizes a charge (credit) for any changes in the fair value of the vested awards.
As of December 31, 2013 and 2012, the liability for settlement of stock appreciation units was $0.5 million and $0.4 million, respectively, and was included in accrued and other current liabilities on the consolidated balance sheet. Based on the fair value of the stock appreciation units as of December 31, 2013, the Company has $0.9 million of unrecognized stock-based compensation expense for stock appreciation units that will be recognized over the remaining weighted-average period of 4.0 years.
Included in 2013 grants in the table above are 0.3 million shares of market-based stock appreciation units granted to key employees. These market-based units will vest if the average closing price of the Company’s common stock over a period of 20 consecutive trading days is equal to or greater than $15.00 per share and the recipient remains in continuous service with the Company through such period, or will fully accelerate and vest in December 2019. The Company estimated the fair value of these market-based units as $4.64 - $5.17 for December 31, 2013 using a Monte Carlo simulation model with the assumptions discussed above. The Company recorded $0.2 million of compensation expense for these stock appreciation units in 2013.
Employee Stock Purchase Plan
As of December 31, 2013, there was $0.7 million of unrecognized stock-based compensation expense for stock purchase rights that will be recognized over the remaining offering period, through November 2014.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Taxes	'
	16. Income taxes
	The provision for income taxes is based upon the income (loss) before income taxes as follows (in thousands):
		Years Ended December 31,
		2013				2012				2011
	U.S. operations	$	(39,618	)		$	(25,599	)		$	(20,712	)
	Non-U.S. operations		6,483				9,291				6,477
		$	(33,135	)		$	(16,308	)		$	(14,235	)
	The components of the provision for income taxes consisted of the following (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Current
	Federal	$	7			$	(103	)		$	(257	)
	State		(11	)			—				—
	Foreign		(1,658	)			(1,119	)			(1,350	)
			(1,662	)			(1,222	)			(1,607	)
	Deferred
	Federal		—				—				—
	State		—				—				—
	Foreign		458				(142	)			452
	Total provision for income taxes from continuing operations		(1,204	)			(1,364	)			(1,155	)
	Benefit from (provision for) income taxes from discontinued operations		—				(114	)			318
	Total provision	$	(1,204	)		$	(1,478	)		$	(837	)
	The provision for income taxes differs from the amount obtained by applying the U.S. federal statutory tax rate as follows (in thousands, except percentages):
		Years Ended December 31,
		2013				2012				2011
	Federal statutory rate		35	%			34	%			34	%
	Tax at federal statutory rate	$	11,597			$	5,599			$	4,840
	State taxes, net of federal benefit		1,058				967				397
	Nondeductible expenses		(260	)			96				138
	Stock-based compensation		(385	)			(529	)			(511	)
	Change in valuation allowance		(13,042	)			(7,308	)			(811	)
	Research and development		1,077				—				485
	Foreign rate differences		(2,129	)			(656	)			3,555
	Earn out adjustment not taxable		(359	)			132				438
	Foreign income inclusion		—				—				(5,140	)
	Change in prior year deferred balances		1,756				826				—
	Acquisition-related costs		(391	)			(491	)			(4,585	)
	Other		(126	)			—				39
		$	(1,204	)		$	(1,364	)		$	(1,155	)
	Deferred income tax assets and liabilities comprise the following (in thousands):
			December 31,
			2013				2012
	Deferred Tax Assets
	Net operating loss carryforwards		$	79,944			$	69,969
	Federal and state credits			9,357				7,747
	Reserves, accruals and other			6,091				5,498
	Fixed assets and intangibles			3,874				902
	Total deferred tax assets			99,266				84,116
	Valuation allowance			(91,045	)			(78,003	)
	Total deferred tax assets, net of valuation allowance			8,221				6,113
	Deferred tax liabilities
	Acquired intangibles			(6,910	)			(5,362	)
	Net deferred tax assets		$	1,311			$	751
	Reported as:
	Current deferred tax assets, included within prepaid expenses and other current assets		$	2,315			$	1,333
	Long-term deferred tax assets, included within other long-term assets			—				71
	Deferred income tax liabilities			(1,004	)			(653	)
	Net deferred tax assets		$	1,311			$	751
	The net valuation allowance increased by $13.0 million, $6.5 million and $15.1 million during the years ended December 31, 2013 2012 and 2011, respectively. The Company did not record a valuation allowance against deferred tax assets in foreign jurisdictions as it believes they were realizable on a more likely than not basis as of December 31, 2013. As of December 31, 2013, the Company had federal and state net operating loss, or NOL, carryforwards of $238.0 million and $155.6 million, respectively. Federal NOL carryforwards start to expire in 2018 and a portion of the state NOL carryforwards will start to expire in 2014. At December 31, 2013, the Company also had federal and state research credit carryovers of $5.1 million and $11.2 million, respectively. The federal credits will begin to expire in 2018 and the state credit can be carried forward indefinitely. Utilization of NOL carryforwards and credits may be subject to substantial annual limitation due to federal and state ownership limitation. The annual limitation may result in the expiration of NOL and tax credit carryforwards before utilization. The deferred tax assets listed above do not include NOL carryforwards that are expected to expire unutilized as a result of existing ownership changes.
	As of December 31, 2013, the Company’s undistributed earnings of foreign subsidiaries were $26.2 million.  Undistributed earnings of the Company’s foreign subsidiaries are considered to be indefinitely reinvested and, accordingly, no provisions for federal and state income taxes have been provided thereon. Upon distribution of those earnings in the form of dividend or otherwise, the Company would be subject to U.S. income taxes (subject to adjustment for foreign tax credits). Determination of the amount of unrecognized deferred income tax liability related to these earnings is not practicable and the amounts are expected to be immaterial.
	Effective January 1, 2008, the China Enterprise Income Tax Law, or the EIT law, imposed a single uniform income tax rate of 25% on all China enterprises, including foreign invested enterprises, and eliminates or modifies most of the tax exemptions, reductions and preferential treatment available under the previous tax laws and regulations. As a result, the Company’s China subsidiaries may be subject to the uniform income tax rate of 25% unless they are able to qualify for preferential status. Currently, they have qualified for a preferential 15% tax rate that is available for new and high technology enterprises. The Company realized benefits from the reduced tax rate of $0.2 million ($0.01 per share), $0.9 million ($0.03 per share) and $0.5 million ($0.02 per share) in the years ended December 31, 2013, 2012 and 2011, respectively. The Company intends to apply to renew the preferential rate of 15% for 2014. In order to retain the preferential rate, the Company must meet certain operating conditions, satisfy certain product requirements, meet certain headcount requirements and maintain certain levels of research expenditures. The Company believes it will continue to meet the requirements.
	At December 31, 2013, the Company’s gross unrecognized tax benefits were approximately $16.5 million, of which $0.2 million would impact the effective tax rate if recognized. One or more of these unrecognized tax benefits could be subject to a valuation allowance if and when recognized in a future period, which could impact the timing of any related effective tax rate benefit. The Company does not believe that the amount of unrecognized tax benefits will change significantly in the next twelve months. There were no interest or penalties related to unrecognized tax benefits. The Company’s policy is to classify interest and penalties associated with unrecognized tax benefits as income tax expense.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
Balance at December 31, 2010	$	5,101
Gross increases for tax positions of prior years		119
Gross increases for tax positions of current year		3,994
Balance at December 31, 2011		9,214
Gross increases for tax positions of prior years		70
Releases for tax positions of prior years		(26	)
Gross increases for tax positions of current year		2,735
Balance at December 31, 2012		11,993
Gross increases for tax positions of prior years		155
Gross increases for tax positions of current year		4,361
Reductions resulting from lapse of applicable statute of limitations		(57	)
Balance at December 31, 2013	$	16,452
The Company’s material tax jurisdictions are the United States federal, California, Japan and China. As a result of NOL carryforwards, substantially all of the Company’s tax years remain open to US federal and state tax examination. All of Japan’s tax years remain open for Japanese tax examination and tax years for 2008 and forward remain open for Chinese tax examination.

Segment_and_Geographic_Informa

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2013
Segment and Geographic Information	'
	17. Segment and geographic information
	The Company operates in one reportable segment. The Company’s Chief Executive Officer, who is considered to be the chief operating decision maker, manages the Company’s operations as a whole and reviews financial information presented on a consolidated basis for purposes of evaluating financial performance and allocating resources.
	The following tables set forth the Company’s revenue and asset information by geographic region. Revenue is classified based on the ship to location of 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. Long-lived assets in the table below comprise only property, plant and equipment (in thousands):
		Years ended December 31,
		2013		2012		2011
	Revenue:
	China	$	122,387	$	121,236	$	129,390
	United States		45,036		66,007		31,180
	Japan		25,451		14,771		15,085
	Rest of world		89,368		43,409		25,374
	Total consolidated revenue	$	282,242	$	245,423	$	201,029
		As of December 31,
		2013		2012
	Long-lived assets:
	China	$	32,993	$	31,922
	United States		20,150		21,706
	Japan		15,690		812
	Rest of world		18		—
	Total long-lived assets	$	68,851	$	54,440

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2013
Selected Quarterly Financial Data	'
	18. Selected Quarterly Financial Data (unaudited)
	The following tables set forth a summary of the Company’s quarterly financial information for each of the four quarters for the years ended December 31, 2013 and 2012.
	Year ended December 31, 2013	First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
			(In thousands, except share and per share data)
	Net revenues	$	56,063		$	74,990		$	76,814		$	74,375
	Gross profit		11,757			15,601			18,179			19,636
	Net loss		(12,240	)		(8,284	)		(9,363	)		(4,452	)
	Basic and diluted net loss per share	$	(0.40	)	$	(0.27	)	$	(0.30	)	$	(0.14	)
	Weighted averages shares used to compute basic and diluted net loss per share		30,574,032			30,779,730			31,184,958			31,450,916
	Year ended December 31, 2012	First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
			(In thousands, except share and per share data)
	Net revenues	$	54,223		$	63,025		$	66,152		$	62,023
	Gross profit		11,406			15,188			20,616			14,050
	Income ( loss) from continuing operations		(11,778	)		(3,656	)		723			(2,961	)
	Income (loss) from discontinued operations		170			—			—			(28	)
	Net income (loss)		(11,608	)		(3,656	)		723			(2,989	)
	Basic and diluted net income (loss) per share:
	Continuing operations	$	(0.47	)	$	(0.13	)	$	0.02		$	(0.10	)
	Discontinued operations	$	0.01		$	—		$	—		$	—
	Net income (loss)	$	(0.46	)	$	(0.13	)	$	0.02		$	(0.10	)
	Weighted averages shares used to compute basic net income (loss) per share		24,870,684			28,402,929			30,215,144			30,414,735
	Weighted averages shares used to compute diluted net income (loss) per share		24,870,684			28,402,929			30,611,304			30,414,735

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Use of Estimates	'
	Use of estimates
	The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported revenue and expenses during the reporting period. Significant estimates made by management include: the useful lives of property, plant and equipment and intangible assets as well as future cash flows to be generated by those assets; fair values of identifiable assets acquired and liabilities assumed in business combinations; allowances for doubtful accounts; valuation allowances for deferred tax assets; write off of excess and obsolete inventories and the valuations and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
Concentration of Credit Risk and Significant Customers	'
	Concentration of credit risk and significant customers
	Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents and trade accounts receivable. The Company’s investment policy requires cash and cash equivalents to be placed with high-credit quality institutions and limits on the amount of credit risk from any one issuer. The Company performs ongoing credit evaluations of its customers’ financial condition whenever deemed necessary and generally does not require collateral. The Company maintains an allowance for doubtful accounts based upon the expected collectability of all accounts receivable, which takes into consideration an analysis of historical bad debts, specific customer creditworthiness and current economic trends.
	For the year ended December 2013, three customers accounted for 27%, 16% and 14% of the Company’s total revenue. For the year ended December 31, 2012, three customers accounted for 36%, 16% and 15% of the Company’s total revenue. For the year ended December 31, 2011, a single customer accounted for 51% of the Company’s total revenue. No other customers accounted for 10% or more of total revenue in any year presented.
	As of December 31, 2013, two customers accounted for 14% and 10% for the Company’s total accounts receivable and as of December 31, 2012, two customers accounted for 42% and 16% of the Company’s total accounts receivable. No other customers accounted for 10% or more of total accounts receivable as of December 31, 2013 or 2012.
Restricted Cash	'
	Restricted cash
	As a condition of the notes payable lending arrangements of the Company’s subsidiaries in China, these subsidiaries are required to keep a compensating balance at the issuing banks that is a percentage of the total notes payable balance until the notes payable are paid. These balances have been excluded from the Company’s cash and cash equivalents balance and are classified as restricted cash on the Company’s consolidated balance sheets. As of December 31, 2013 and 2012, the amount of restricted cash was $2.1 million and $2.6 million, respectively.
Cash, Cash Equivalents and Investments	'
	Cash, cash equivalents and investments
	Highly liquid investments with a maturity of 90 days or less at the date of purchase are considered cash equivalents. Cash and cash equivalents consist primarily of bank deposits.  The Company’s policy is to classify money market accounts as short-term investments other than minor amounts included in cash equivalents for administrative purposes.
	The Company regularly reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. Factors considered in determining whether a loss is other-than-temporary include: the length of time and extent to which the fair market value has been lower than the cost basis, the financial condition and near-term prospects of the investee, credit quality, likelihood of recovery, and the Company’s ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in fair market value.
	Unrealized gains and losses, net of tax, are included in accumulated other comprehensive income as a separate component of stockholders’ equity on the consolidated balance sheets. The amortization of premiums and discounts on the investments, and realized gains and losses on available-for-sale securities are included in other income (expense), net in the consolidated statements of operations. The Company uses the specific-identification method to determine cost in calculating realized gains and losses upon sale of its marketable securities.
	Marketable securities are reported at fair value and are classified as available-for-sale investments in our current assets because they represent investments of cash available for current operations.
Fair Value Measurements	'
	Fair Value Measurements
	Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties. A liability’s fair value is defined as the amount that would be paid to transfer the liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative accounting guidance describes a fair value hierarchy based on three levels of inputs that may be used to measure fair value, of which the first two are considered observable and the last is considered unobservable. These levels of inputs are as follows:
	Level 1—Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.
	Level 2—Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the asset or liability. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
	Level 3—Unobservable inputs that reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.
	For marketable securities measured at fair value using Level 2 inputs, we review trading activity and pricing for these investments as of the measurement date. When sufficient quoted pricing for identical securities is not available, we use market pricing and other observable market inputs for similar securities obtained from various third party data providers. These inputs either represent quoted prices for similar assets in active markets or have been derived from observable market data.
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
	Certain of the Company’s assets, including intangible assets and goodwill are re-measured at fair value if impairment is indicated.
	During 2011, the Company recorded a goodwill impairment charge of $13.1 million (See Note 8). This fair value measurement was calculated using unobservable inputs, using both the income and market approach, which are classified as Level 3 within the fair value hierarchy. Inputs for the income approach included the amount and timing of future cash flows based on the Company’s operational budgets, strategic plans, terminal growth rates assumptions and other estimates. The primary input for the market approach included market multiples for guideline companies that operate in a similar business environment.
	Assets and Liabilities Not Measured at Fair Value
	The carrying values of cash and cash equivalents, restricted cash, accounts receivable, accounts payable and notes payable approximate their fair values due to the short-term nature and liquidity of these financial instruments.
	The fair values of the Company’s long-term debt have been calculated using an estimate of the interest rate the Company would have had to pay on the issuance of liabilities with a similar maturity and discounting the cash flows at that rate which it considers to be a level 2 fair value measurement. The fair values do not necessarily give an indication of the amount that the Company would currently have to pay to extinguish any of this debt.
	The fair value of the Company’s variable rate bank borrowings was not materially different than its carrying value at December 31, 2013 as the interest rates approximated rates currently available to the Company and was approximately $21.2 million (carrying value of $22.2 million) at December 31, 2012. The fair value of the Company’s acquisition-related debt was approximately $10.0 million (carrying value of $9.975 million) at December 31, 2013.
Accounts Receivable	'
	Accounts receivable
	Accounts receivable include trade receivables and notes receivable from customers. The Company receives notes receivable in exchange for accounts receivable from certain customers in China that are secured by the customer’s affiliated financial institution. The notes are generally due within 6 months.
	An allowance for doubtful accounts is calculated based on the aging of the Company’s trade receivables, historical experience, and management judgment. The Company writes off trade receivables against the allowance when management determines a balance is uncollectible and no longer actively pursues collection of the receivable.
Inventories	'
	Inventories
	Inventories consist of on-hand raw materials, work-in-progress inventories and finished goods. Raw materials and work-in-process inventories are stored mainly on the Company’s premises. Finished goods are stored on the Company’s premises as well as on consignment at certain customer sites.
	Inventories are stated at the lower of standard cost, which approximates actual cost determined on the weighted average basis, or market value. Inventories are recorded using the first-in, first-out method. The Company routinely evaluates quantities and values of inventories in light of current market conditions and market trends, and records a write-down for quantities in excess of demand and product obsolescence. The evaluation may take into consideration historic usage, expected demand, anticipated sales price, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, customer concentrations, product merchantability and other factors. Market conditions are subject to change and actual consumption of inventory could differ from forecasted demand. The Company also regularly reviews the cost of inventories against their estimated market value and records a lower of cost or market write-down for inventories that have a cost in excess of estimated market value, resulting in a new cost basis for the related inventories which is not reversed.
Business Combinations	'
	Business Combinations
	We allocate the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair values of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to intangible assets.
	Fair value estimates are based on the assumptions management believes a market participant would use in pricing the asset or liability. Critical estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from customer relationships and acquired patents and developed technology; and discount rates. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates.
	Amounts recorded in a business combination may change during the measurement period, which is a period not to exceed one year from the date of acquisition, as additional information about conditions existing at the acquisition date becomes available.
	Net Tangible Assets
	Santur’s tangible assets acquired and liabilities assumed as of October 12, 2011 were recorded at estimated fair value. The Company increased Santur’s historical value of fixed assets by $5.8 million to adjust the fixed assets to an amount equivalent to the fair market value. The fair value of fixed assets acquired was determined using several approaches depending on the nature of the fixed asset including a market approach and cost approach if market data was not available. The Company also increased Santur’s cost of inventory by $0.2 million. The fair value of inventory acquired was determined using an income approach based upon the expected sales value of the inventory, less direct costs associated with the sale of the inventory and an allocation of profit margins between the buyer and seller.
	Intangible Assets
	Developed technology represents products that have reached technological feasibility. Santur’s current products offerings include tunable lasers and transmitters, integrated tunable laser assemblies with narrow line width, and a family of PIC products that enable high capacity 40Gbps and 100Gbps transceivers. The fair value of developed technology intangibles acquired was determined using an income approach called the multi-period excess-earnings method, which involves forecasting the net earnings to be generated by the asset, reducing them by appropriate returns on contributory assets, and then discounting the resulting net returns to a present value using the Company’s discount rate. The Company amortizes the developed technology intangible asset over an average estimated life of 5 years and amortization expense is recorded to cost of goods sold.
	Customer relationships represent the value placed on Santur’s distribution channels and end users. The fair value of customer relationship intangibles were determined based on the incremental cash flow afforded by having the customer relationships in place on the acquisition date versus having no relationships in place and needing to replicate or replace those relationships. The Company amortizes the customer relationships intangible asset over an average estimated life of 5 years and amortization expense is recorded to operating expenses.
	In-process research and development represents four Santur research and development projects that had not reached technological feasibility as of the closing date of the acquisition. Acquired in-process research and development was recorded at fair value as an indefinite-lived intangible asset at the acquisition date until the completion or abandonment of the associated research and development efforts. The fair value of in-process research and development, similar to developed technology intangibles acquired, was determined using an income approach called the multi-period excess-earnings approach, with the additional inclusion of estimated costs required to complete the projects. These projects were completed in 2012. The Company amortizes the assets over an average estimated life of 5 years and amortization expense is recorded to cost of goods sold.
Goodwill	'
	Goodwill
	Goodwill is reviewed for impairment at least annually or more frequently if events or changes in circumstances indicate that the carrying value of goodwill may not be recoverable. The Company will first assess the qualitative factors to determine whether it is more likely than not that the fair value of our single reporting operating unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment under Accounting Standards Update (ASU) No. 2011-08, Goodwill and Other (Topic 350): Testing Goodwill for Impairment, issued by the Financial Accounting Standards Board (FASB). If the Company determines that it is more likely than not that its fair value is less than its carrying amount, then the two-step goodwill impairment test is performed. The first step, identifying a potential impairment, compares the fair value of the reporting unit with its carrying amount. If the carrying amount exceeds its fair value, the second step would need to be performed; otherwise, no further steps are required. The second step, measuring the impairment loss, compares the implied fair value of the goodwill with the carrying amount of the goodwill. Any excess of the goodwill carrying amount over the applied fair value is recognized as an impairment loss, and the carrying value of goodwill is written down to fair value. The Company recognized a goodwill impairment charge of $13.1 million in 2011 and did not have any goodwill on its consolidated balance sheets at December 31, 2013 or 2012.
	Both an income and market approach were used to estimate the fair value of the reporting unit. For the income approach, the Company used a discounted cash flow analysis, which included assumptions about future revenue, operating expenses, taxes and working capital and capital asset requirements. Material assumptions used for the income approach were eleven years of projected net cash flows, a discount rate of 18%, and a long-term growth rate of 5%. For the market approach, the Company used a market capitalization analysis, guideline public company analysis and a guideline transactions analysis. The market capitalization approach used the mid-point of the range of closing share prices of the Company’s common stock as of the valuation date and for the three months prior to the valuation date and applied a 40% control premium. The guideline public company analysis measured the enterprise value of eleven companies and also applied a 40% control premium. The guideline transactions analysis looked at thirteen transactions in the optical components industry over the last 3.5 years.
	The resulting analyses were weighted as follows in measuring the fair value of the reporting unit:
	Discounted cash flow	16.7	%
	Market capitalization	50	%
	Guideline public company	16.7	%
	Guideline transactions	16.7	%
	The market capitalization analysis was weighted higher than the other approaches, as the Company believes that the value indication provided by the market is highly relevant to the valuation of the reporting unit.
Long-Lived Assets	'
	Long-lived assets
	Property, plant and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization is computed using the straight-line method over the following estimated useful lives:
	Buildings	20-30 years
	Machinery and equipment	2-7 years
	Furniture, fixtures and office equipment	3-5 years
	Software	5-7 years
	Leasehold improvements	life of the asset or lease term, if shorter
	Repairs and maintenance costs are expensed as incurred.
	Intangible assets acquired in a business combination are recorded at fair value. Identifiable finite-lived intangible assets are amortized over the period of estimated benefit using the straight-line method, reflecting the pattern of economic benefits associated with these assets. The estimated useful lives of the Company’s intangible assets generally range from five to seven years, except for acquired land use rights in China, which have an estimated useful life of 45 years.
	The carrying value of intangible assets and other long-lived assets is reviewed on a regular basis for the existence of facts or circumstances, both internally and externally, that may suggest impairment. Some factors which the Company considers to be triggering events for impairment review include a significant decrease in the market value of an asset, a significant change in the extent or manner in which an asset is used, a significant adverse change in the business climate that could affect the value of an asset, an accumulation of costs for an asset in excess of the amount originally expected, a current period operating loss or cash flow decline combined with a history of operating loss or cash flow uses or a projection that demonstrates continuing losses and a current expectation that, it is more likely than not, a long-lived asset will be disposed of at a loss before the end of its estimated useful life.
	If one or more of such facts or circumstances exist, the Company will evaluate the carrying value of long-lived assets to determine if impairment exists, by comparing it to estimated undiscounted future cash flows over the remaining useful life of the assets. If the carrying value of the assets is greater than the estimated future cash flow, the assets are written down to the estimated fair value. The Company’s cash flow estimates contain management’s best estimates, using appropriate and customary assumptions and projections at the time. Any write-down would be treated as a permanent reduction in the carrying amount of the asset and an operating loss would be recognized.
Revenue Recognition	'
	Revenue recognition
	Revenue is derived from the sale of the Company’s products. The Company recognizes revenue provided that persuasive evidence of an arrangement exists, delivery has occurred, the price is fixed or determinable and collectability is reasonably assured. Contracts and/or customer purchase orders are used to determine the existence of an arrangement. Delivery is considered to have occurred when title and risk of loss have transferred to the customer. The price is equal to the amount invoiced to the customer and is not subject to adjustment and customers do not have the right of return. The Company evaluates the creditworthiness of its customers to determine that appropriate credit limits are established prior to the acceptance of an order.
	Revenue is recognized when the product is shipped and title has transferred to the buyer. The Company bears all costs and risks of loss or damage to the goods up to that point. On most orders, the Company’s shipment terms provide that title passes to the buyer upon shipment by the Company. Other shipment terms may provide that title passes to the buyer upon delivery of the goods to the buyer. Revenue related to the sale of consignment inventory at customer vendor managed locations is not recognized until the product is pulled from inventory stock by customers. Shipping and handling costs are included in the cost of goods sold. The Company presents revenue net of sales taxes and any similar assessments.
Product Warranties	'
	Product warranties
	The Company provides warranties to cover defects in workmanship, materials and manufacturing for a period of one to two years to meet the stated functionality as agreed to in each sales arrangement. Products are tested against specified functionality requirements prior to delivery, but the Company nevertheless from time to time experiences claims under its warranty guarantees. The Company accrues for estimated warranty costs under those guarantees based upon historical experience, and for specific items, at the time their existence is known and the amounts are determinable.
Research and Development	'
	Research and development
	Research and development expense consists of personnel costs, including stock-based compensation expense, for the Company’s research and development personnel and product development costs, including engineering services, development software and hardware tools, depreciation of capital equipment and facility costs. Research and development costs are expensed as incurred.
Advertising Costs	'
	Advertising costs
	Advertising costs are expensed as incurred and, to date, have not been significant.
Stock-Based Compensation	'
	Stock-based compensation
	The Company grants stock options, stock purchase rights, stock appreciation units and restricted stock units to employees, consultants and directors. The stock-based awards are accounted for at fair value.
	The Company generally determines the fair value of stock options on the date of grant utilizing the Black-Scholes-Merton option-pricing model. The fair value of the options is recognized over the period during which an employee is required to provide services in exchange for the option award, known as the requisite service period (usually the vesting period) on a straight-line basis.
	Stock purchase rights are accounted for at fair value, utilizing the Black-Scholes-Merton option-pricing model. The expense for each purchase period is recognized on a straight-line basis over the requisite service period, from the beginning of the offering period through the respective purchase date.
	The Company records an expense (credit) and an equal adjustment to the liability for stock appreciation units equal to the fair value of the vested portion of the awards as of each period end. Each reporting period thereafter, compensation expense will be recorded, based on the remaining service period and the then fair value of the award until vesting of the award is completed. After vesting is completed, the Company will continue to re-measure the fair value of the liability until the award is exercised or expires, with changes in the fair value of the liability recorded in the consolidated statements of operations.
	Restricted stock units are valued at the closing sales price as quoted on the New York Stock Exchange on the date of grant, and are converted into shares of common stock upon vesting on a one-for-one basis. Vesting of restricted stock units is subject to the employee’s continuing service to the Company. The compensation expense related to the restricted stock units is determined using the fair value of common stock on the date of grant, and the expense is recognized on a straight-line basis over the vesting period.
	Stock-based compensation expense recognized at fair value includes the impact of estimated forfeitures. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	Expected term. The expected term for stock options was estimated using the Company’s historical exercise behavior and expected future exercise behavior. Vested stock appreciation units first became exercisable upon the expiration of the lock-up period associated with the initial public offering. Therefore, the Company estimated the term of the award based on an average of the weighted-average exercise period and the remaining contractual term. The expected term for the ESPP represents the period of time from the beginning of the offering period to the purchase date.
	Volatility. Due to the limited history of the trading of the Company’s common stock since the initial public offering in February 2011, the expected volatility used by the Company is based on volatility of similar entities. In evaluating similarity, factors such as industry, stage of life cycle, size, and financial leverage are taken into consideration. The term over which volatility was measured was commensurate with the expected term.
	Risk-free interest rate. The risk-free rate that the Company uses in the Black-Scholes-Merton option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term on the options.
	Expected dividends. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
Income Taxes	'
	Income taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the carrying amounts of existing assets and liabilities in the financial statements and their respective tax bases, and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in the consolidated statement of operations in the period that includes the enactment date.
	The Company operates in various tax jurisdictions and is subject to audit by various tax authorities. In preparing the Company’s consolidated financial statements, the Company is required to estimate its taxes in each of the jurisdictions in which it operates. The Company estimates actual current tax exposure as well as assesses temporary differences resulting from different treatment of items, such as accruals and allowances not currently deductible for tax purposes. These differences result in deferred tax assets which represent future tax benefits to be received when certain expenses previously recognized in the financial statements become deductible expenses under applicable income tax laws, or loss credit carryforwards are utilized.
	In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of a deferred tax asset will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. A valuation allowance is recorded for loss carryforwards and other deferred tax assets where it is more likely than not that such deferred tax assets will not be realized.
	At December 31, 2013, the Company’s gross unrecognized tax benefits were approximately $16.5 million, of which $0.2 million would impact the effective tax rate if recognized. One or more of these unrecognized tax benefits could be subject to a valuation allowance if and when recognized in a future period, which could impact the timing of any related effective tax rate benefit. The Company does not believe that the amount of unrecognized tax benefits will change significantly in the next twelve months. There were no interest or penalties related to unrecognized tax benefits. The Company’s policy is to classify interest and penalties associated with unrecognized tax benefits as income tax expense.
Foreign Currency Translations	'
	Foreign currency
	Generally the functional currency of the Company’s international subsidiaries is the local currency. The Company translates the financial statements of these subsidiaries to U.S. dollars using month-end rates of exchange for assets and liabilities, and average rates of exchange for revenue, costs, and expenses. Translation gains and losses are recorded in accumulated other comprehensive income as a component of stockholders’ equity. Net gains (losses) resulting from foreign exchange transactions were $0.9 million, ($0.2) million, and ($0.1) million for the years ended December 31, 2013, 2012, and 2011, respectively. These gains and losses were recorded as other income (expense), net in our consolidated statements of operations.
Net Income (loss) per Share Attributable to NeoPhotonics Corporation Common Stockholders	'
	Net income (loss) per share attributable to NeoPhotonics Corporation common stockholders
	The Company applies the two-class method for calculating and presenting net income (loss) per share attributable to NeoPhotonics Corporation common stockholders. Under the two-class method, net income (loss) is allocated between common shares and other participating securities based on their participating rights. Participating securities are defined as securities that participate in dividends with common shares according to a predetermined formula. Basic net income (loss) per share attributable to NeoPhotonics Corporation common stockholders is calculated by dividing net income (loss) attributable to NeoPhotonics Corporation common stockholders by the weighted average number of shares outstanding for the period. Diluted net income (loss) per share attributable to NeoPhotonics Corporation common stockholders is calculated by dividing net income (loss) attributable to NeoPhotonics Corporation common stockholders and income allocable to participating securities to the extent it is dilutive, by the weighted average number of common shares and potential dilutive common share equivalents outstanding during the period if the effect is dilutive.
Recent Accounting Pronouncements	'
	Recent accounting pronouncements
	In February 2013, the FASB issued amendments to the FASB Accounting Standard Codification to improve the reporting of reclassifications out of accumulated other comprehensive income. The amendments require new disclosures for items reclassified out of accumulated other comprehensive income (“AOCI”), including (1) changes in AOCI balances by component and (2) significant items reclassified out of AOCI. The guidance does not amend any existing requirements for reporting net income or OCI in the financial statements. As this guidance only requires expanded disclosures, the adoption of this guidance did not have a material effect on the Company’s consolidated financial statements.
	In March 2013, the FASB issued amendments to the FASB Accounting Standard Codification, which indicates that the entire amount of a cumulative translation adjustment related to an entity’s investment in a foreign entity should be released when there has been a (i) sale of a subsidiary or group of net assets within a foreign entity and the sale represents the substantially complete liquidation of the investment in the foreign entity, (ii) loss of a controlling financial interest in an investment in a foreign entity, or (iii) step acquisition for a foreign entity. The amendments were effective prospectively for fiscal years beginning after December 15, 2013. Early adoption is permitted. The adoption of this guidance did not have an impact on the Company’s consolidated financial statements.
	In July 2013, the FASB issued amendments to the FASB Accounting Standard Codification on Income Taxes, to improve the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This guidance is expected to reduce diversity in practice and is expected to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. This guidance was effective for reporting periods beginning after December 15, 2013. The adoption of this guidance did not have an impact on the Company’s consolidated financial statements.
	In April 2014, the FASB issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08") which raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. ASU 2014-08 is effective for annual periods beginning on or after December 15, 2014. Early adoption is permitted but only for disposals that have not been reported in financial statements previously issued. The Company is currently in the process of evaluating the impact of the adoption on its consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through a cumulative adjustment.  The Company is in the process of evaluating the impact of adoption on its consolidated financial statements.

The_Company_and_Basis_of_Prese1

The Company and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2013
Effect of Reclassification on Balance Sheet	'
	As further described in Note 14, the Company may be required to pay a $5.0 million penalty if it does not achieve certain performance obligations agreed to in connection with the sale of its common stock in a private placement transaction in April 2012. The penalty payment was originally classified outside of equity as redeemable common stock at December 31, 2012 since, while the Company intends to meet its performance obligations, it determined the ability to satisfy some of the obligations may be outside of the Company’s control. The Company has since determined that the $5.0 million penalty payment is an embedded derivative instrument, with the underlying being the performance or nonperformance of meeting its performance obligations by the deadline, and has revised to correctly classify $4.9 million of the $5.0 million to additional paid-in capital and the remaining $0.1 million, representing the estimated fair value of the penalty payment derivative, to other noncurrent liabilities at December 31, 2012.  The Company has assessed the impact of the correction on the 2012 interim and annual consolidated balance sheets and has concluded that the correction is not material to the previously reported consolidated balance sheets.   The effect on the Company’s balance sheet at December 31, 2012 for this matter was as follows:
		December 31, 2012
	(in thousands)	Previously		As Revised
		Reported
	Other noncurrent liabilities	$	1,724	$	1,862
	Redeemable common stock		5,000		—
	Additional paid-in capital		433,996		438,858

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Estimated Useful Lives of Property, Plant and Equipment	'
	Property, plant and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation and amortization is computed using the straight-line method over the following estimated useful lives:
	Buildings	20-30 years
	Machinery and equipment	2-7 years
	Furniture, fixtures and office equipment	3-5 years
	Software	5-7 years
	Leasehold improvements	life of the asset or lease term, if shorter

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
Revenue and Components of Net Income Related to Discontinued Operations	'
	The results of operations associated with Broadband are presented as discontinued operations in the Company’s consolidated statements of operations for the years ended December 31, 2012 and 2011. Revenue and the components of net income related to the discontinued operations were as follows (in thousands):
		2012			2011
	Revenue	$	590		$	5,085
	Income from discontinued operations before income taxes	$	256		$	318
	Benefit from (provision for) income taxes		(114	)		318
	Net income from discontinued operations	$	142		$	636

Cash_Cash_Equivalents_and_Shor1

Cash, Cash Equivalents and Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Summary 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 the cash, cash equivalents and investments in marketable securities designated as available-for-sale (in thousands):
		As of December 31, 2013									As of December 31, 2012
		Amortized		Gross		Gross			Fair		Amortized		Gross		Gross			Fair
		Cost		Unrealized		Unrealized			Value		Cost		Unrealized		Unrealized			Value
				Gains		Losses							Gains		Losses
	Cash and cash equivalents
	Money market funds	$	11	$	—	$	—		$	11	$	11	$	—	$	—		$	11
	Short-term investments
	Money market funds		4,577		—		—			4,577		7,259		—		—			7,259
	Corporate bonds		6,708		3		(5	)		6,706		23,151		43		(1	)		23,193
	U.S. federal agencies		—		—		—			—		27,241		10		—			27,251
	Foreign bonds and notes		4,827		5		—			4,832		4,682		14		—			4,696
	Variable rate demand notes		1,801		—		—			1,801		1,902		—		—			1,902
	Total short-term investments		17,913		8		(5	)		17,916		64,235		67		(1	)		64,301
	Total	$	17,924	$	8	$	(5	)	$	17,927	$	64,246	$	67	$	(1	)	$	64,312
Maturities of Investments	'
	The following table summarizes the estimated fair value of the short-term investments in marketable securities designated as available-for-sale and classified by the contractual maturity date of the security as of December 31, 2013 and 2012 (in thousands):
		December 31,		December 31,
		2013		2012
	Less than 1 year	$	14,118	$	51,861
	Due in 1 to 2 years		2,008		10,550
	Due in 2 to 5 years		—		—
	Due after 5 years		1,801		1,901
	Total	$	17,927	$	64,312

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
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 December 31, 2013								As of December 31, 2012
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash, cash equivalents and short-term investments:
	Money market funds	$	4,588	$	—	$	—	$	4,588	$	7,270	$	—	$	—	$	7,270
	Corporate bonds		—		6,706		—		6,706		—		23,193		—		23,193
	U.S. federal agencies		—		—		—		—		—		27,251		—		27,251
	Foreign bonds and notes		—		4,832		—		4,832		—		4,696		—		4,696
	Variable rate demand notes		—		1,801		—		1,801		—		1,902		—		1,902
	Mutual funds held in Rabbi Trust		442		—		—		442		188		—		—		188
Fair Value of Financial Liabilities	'
	The following table presents the Company’s liabilities that are measured at fair value on a recurring basis (in thousands):
		As of December 31, 2013								As of December 31, 2012
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Contingent consideration	$	—	$	—	$	1,985	$	1,985	$	—	$	—	$	959	$	959
	(Note 13)
	Penalty payment derivative	$	—	$	—	$	239	$	239	$	—	$	—	$	138	$	138
	(Note 14)

Net_Income_Loss_per_Share_Attr1

Net Income (Loss) per Share Attributable to NeoPhotonics Corporation Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2013
Computation of Basic and Diluted Net Loss per Share	'
	The following table sets forth the computation of the basic and diluted loss per share attributable to NeoPhotonics Corporation common stockholders for the periods indicated (in thousands, except share and per share amounts):
		Years ended December 31,
		2013			2012			2011
	Numerator:
	Loss from continuing operations	$	(34,339	)	$	(17,672	)	$	(15,390	)
	Less: Accretion of redeemable convertible preferred stock		—			—			(7	)
	Less: deemed dividend on beneficial conversion of Series X redeemable convertible preferred stock		—			—			(17,049	)
	Loss from continuing operations attributable to NeoPhotonics Corporation common stockholders		(34,339	)		(17,672	)		(32,446	)
	Income from discontinued operations		—			142			636
	Loss attributable to NeoPhotonics Corporation common stockholders	$	(34,339	)	$	(17,530	)	$	(31,810	)
	Denominator:
	Weighted average shares used to compute basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders		31,000,325			28,529,849			22,359,802
	Basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders:
	Continuing operations	$	(1.11	)	$	(0.62	)	$	(1.45	)
	Discontinued operations	$	—		$	—		$	0.03
	Net income (loss)	$	(1.11	)	$	(0.62	)	$	(1.42	)
Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders	'
	The Company has excluded the impact of outstanding employee stock options, restricted stock units, common stock warrants and shares expected to be issued under its employee stock purchase plan from the computation of diluted net loss per share attributable to NeoPhotonics Corporation common stockholders, as their effect would have been antidilutive. The shares potentially issuable for each of these outstanding awards at December 31, 2013, 2012 and 2011 were as follows:
		December 31,
		2013			2012			2011
	Employee stock options		4,103,454			2,773,887			2,631,524
	Restricted stock units		1,169,649			924,823			517,445
	Employee stock purchase plan		403,329			475,592			505,324
	Common stock warrants		4,482			4,482			4,482
			5,680,914			4,178,784			3,658,775

Business_Combination_Tables

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2013
Summary of Purchase Accounting and Tangible and Intangible Assets Acquired	'
	The following table summarizes the acquisition accounting and the tangible and intangible assets acquired as of the date of acquisition and subsequent adjustments (in thousands):
	Total purchase consideration:
	Cash paid	$	13,128
	Notes payable		11,130
		$	24,258
	Liabilities assumed:
	Pension and retirement obligations	$	6,471
	Other compensation-related liabilities		1,083
	Other current liabilities		1,265
		$	8,819
	Fair value of assets acquired:
	Inventory	$	13,309
	Other current assets		35
	Land, property, plant and equipment		14,433
	Intangible assets acquired:
	Developed technology		2,120
	Customer relationships		3,180
		$	33,077
	The following table summarizes the purchase accounting and the net tangible assets acquired as of the date of acquisition (in thousands):
	Total purchase consideration:
	Cash transferred upon closing	$	44,396
	Fair value of contingent consideration		2,800
			47,196
	Less the fair value of net assets acquired:
	Net tangible assets acquired		21,243
	Intangible assets acquired:
	Developed technology		11,800
	Customer relationships		5,000
	In-process research and development		370
			38,413
	Goodwill	$	8,783
	Details of the net assets acquired are as follows (in thousands):
	Cash and cash equivalents	$	5,410
	Accounts receivable, net		10,253
	Inventories		7,578
	Prepaid and other current assets.		1,329
	Property, plant and equipment		13,500
	Other non-current assets		453
	Accounts payable		(8,371	)
	Other accrued liabilities		(8,798	)
	Lease obligation		(111	)
	Total net tangible assets acquired	$	21,243
Pro forma Information for Business Acquisition	'
	The unaudited pro forma results do not assume any operating efficiencies as a result of the consolidation of operations (in thousands, except per share data):
		Year ended December 31,
		2013			2012
	Revenue	$	294,933		$	305,286
	Net loss	$	(23,340	)	$	(11,014	)
	Basic and diluted net loss per share	$	(0.75	)	$	(0.39	)
	The pro forma information for the year ended December 31, 2011 is as follows (in thousands, except per share amounts):
	Total revenues	$	236,449
	Net loss		(29,352	)
	Net loss attributable to NeoPhotonics Corporation		(29,352	)
	Net loss attributable to NeoPhotonics Corporation common stockholders		(46,408	)
	Basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders		(2.08	)

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Weighted Analyses of Measuring Fair Value of Reporting Unit	'
	The resulting analyses were weighted as follows in measuring the fair value of the reporting unit:
	Discounted cash flow		16.7	%
	Market capitalization		50	%
	Guideline public company		16.7	%
	Guideline transactions		16.7	%
Purchased Intangible Assets	'
	Purchased intangible assets consist of the following (in thousands):
		December 31, 2013								December 31, 2012
		Gross			Accumulated			Net		Gross		Accumulated			Net
		Assets			Amortization			Assets		Assets		Amortization			Assets
	Technology and patents	$	34,524		$	(25,931	)	$	8,593	$	32,176	$	(22,869	)	$	9,307
	Customer relationships		15,004			(9,732	)		5,272		11,898		(8,148	)		3,750
	Leasehold interest		1,406			(266	)		1,140		1,355		(241	)		1,114
	Non-compete agreements		950			(950	)		—		950		(908	)		42
		$	51,884		$	(36,879	)	$	15,005	$	46,379	$	(32,166	)	$	14,213
Amortization Expense of Purchased Intangible Assets	'
	The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the consolidated statements of operations (in thousands):
		Years ended December 31,
		2013			2012			2011
	Cost of goods sold	$	2,543		$	2,472		$	598
	Operating expenses		1,532			1,316			994
	Total	$	4,075		$	3,788		$	1,592
Estimated Future Amortization Expense of Purchased Intangible Assets	'
	The estimated future amortization expense of purchased intangible assets as of December 31, 2013, is as follows (in thousands):
	2014	$	4,402
	2015		4,386
	2016		3,640
	2017		793
	2018		580
	Thereafter		1,204
		$	15,005

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2013
Accounts Receivable, Net	'
	Accounts receivable, net consists of the following (in thousands):
		December 31,
		2013			2012
	Accounts receivable	$	57,010		$	66,338
	Trade notes receivable		8,054			4,979
	Allowance for doubtful accounts		(531	)		(963	)
		$	64,533		$	70,354
Summary of Movement in Allowance for Doubtful Accounts	'
	The table below summarizes the movement in the Company’s allowance for doubtful accounts (in thousands):
	Balance at December 31, 2010	$	(1,582	)
	Provision for bad debt		(196	)
	Write-offs, net of recoveries		1,272
	Balance at December 31, 2011		(506	)
	Provision for bad debt		(457	)
	Write-offs, net of recoveries		—
	Balance at December 31, 2012		(963	)
	Provision for bad debt		253
	Write-offs, net of recoveries		179
	Balance at December 31, 2013	$	(531	)
Inventories	'
	Inventories consist of the following (in thousands):
		December 31,
		2013			2012
	Raw materials	$	26,379		$	19,038
	Work in process		14,341			8,940
	Finished goods		24,188			15,815
		$	64,908		$	43,793
Property, Plant and Equipment, Net	'
	Property, plant and equipment, net consist of the following (in thousands):
		December 31,
		2013			2012
	Land	$	3,167		$	—
	Buildings		23,194			16,484
	Machinery and equipment		104,287			92,139
	Furniture, fixtures, software and office equipment		11,441			8,300
	Leasehold improvements		7,837			4,373
			149,926			121,296
	Less: Accumulated depreciation		(81,075	)		(66,856	)
		$	68,851		$	54,440
Accrued Expenses and Other Current Liabilities	'
	Accrued and other current liabilities consist of the following (in thousands):
		December 31,
		2013			2012
	Employee-related	$	12,297		$	12,293
	Other		11,346			7,666
		$	23,643		$	19,959
Summary of Movement in Warranty Accrual	'
	The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands):
		Years ended December 31,
		2013			2012			2011
	Beginning balance	$	1,072		$	1,443		$	299
	Warranty accruals		1,514			385			393
	Assumed warranty from acquisitions		135			—			999
	Settlements and adjustments		(984	)		(756	)		(248	)
	Ending balance	$	1,737		$	1,072		$	1,443	-1
	-1	Included within the ending balance is an accrual of $0.3 million relating to a specific part, for which the liability was assumed as part of the acquisition of Santur. The Company did not experience any claims for this product after October 2011 and it believed warranty claims were remote. Therefore, the Company released this obligation in the fourth quarter of 2012.
Other Noncurrent Liabilities	'
	Other noncurrent liabilities consist of the following (in thousands):
			December 31,
			2013			2012
	Pension and other employee-related		$	6,206		$	188
	Penalty payment derivative			239			138
	Other			1,542			1,536
			$	7,987		$	1,862

Restructuring_Tables

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2013
Restructuring and Related Costs	'
	The following table summarizes activity associated with the restructuring during the year ended December 31, 2013 (in thousands):
		Severance			Facilities			Contract			Total
								Termination
	Restructuring obligations, December 31, 2012	$	—		$	—		$	—		$	—
	Restructuring costs incurred in 2013		699			318			457			1,474
	Cash payments		(699	)		(178	)		(391	)		(1,268	)
	Non-cash settlements and other		—			71			—			71
	Restructuring obligations, December 31, 2013	$	—		$	211		$	66		$	277

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Components of Debt, Obligations, Weighted Average Interest Rate and Additional Fair Value Information Relating to Outstanding Debt Instruments	'
	The table below summarizes the carrying amount and weighted average interest rate of the Company’s notes payable and long-term debt (in thousands, except percentages):
		December 31, 2013						December 31, 2012
		Carrying			Weighted			Carrying			Weighted
		Amount			Average			Amount			Average
					Interest						Interest
					Rate						Rate
	Notes payable	$	9,738			—		$	12,003			—
	Long-term debt:
	Acquisition-related	$	9,975			1.5	%	$	—			—
	Bank borrowings		24,500			2.92	%		22,167			2.2	%
			34,475						22,167
	Less: current portion of long-term debt		(10,325	)					(5,000	)
	Total long-term debt, net of current portion	$	24,150					$	17,167
Maturities of Long-term Debt	'
	At December 31, 2013, maturities of long-term debt were as follows (in thousands):
	2014	$	10,325
	2015		10,325
	2016		10,325
	2017		3,500
		$	34,475

Japan_Defined_Benefit_Pension_1

Japan Defined Benefit Pension Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Funded Status Plans	'
	The funded status of these plans for the period from March 29, 2013 to December 31, 2013 was as follows (in thousands):
			RAP			DBCPP
	Change in projected benefit obligation:
	Projected benefit obligation, March 29, 2013	$	5,795		$	2,706
	Service cost		175			78
	Interest cost		39			18
	Benefits paid		(140	)		—
	Actuarial (gain)/loss		177			(14	)
	Currency translation adjustment		(600	)		(280	)
	Projected benefit obligation, end of period	$	5,446		$	2,508
	Change in plan assets:
	Plan assets at fair value, March 29, 2013	$	—		$	2,037
	Employer contributions		—			585
	Actual return on plan assets		—			(304	)
	Currency translation adjustment		—			(246	)
	Plan assets at calculated amount, end of period	$	—		$	2,072
	Amounts recognized in consolidated balance sheets:
	Accrued and other current liabilities	$	115		$	—
	Other noncurrent liabilities	$	5,331		$	436
	Amount recognized in accumulated other comprehensive loss:
	Defined benefit pension plans adjustment	$	177		$	319
	Accumulated benefit obligation, end of period	$	4,929		$	2,508
Periodic Pension Cost	'
	Net periodic pension cost associated with these plans for the period from March 29, 2013 to December 31, 2013 included the following components (in thousands):
			RAP			DBCPP
	Service cost	$	175		$	78
	Interest cost		39			18
	Expected return on plan assets		—			(30	)
	Net periodic pension costs	$	214		$	66
Projected and Accumulated Benefit Obligations	'
	The projected and accumulated benefit obligations for the plans were calculated as of December 31, 2013 using the following assumptions:
			RAP			DBCPP
	Discount rate		0.7	%		1.6	%
	Expected return on plan assets		—	%		1.7	%
	Salary increase rate		4.5	%		1.2	%
Estimated Future Benefit Payments Under Plans	'
	Estimated future benefit payments under the plans are as follows (in thousands):
			RAP			DBCPP
	2014	$	115		$	85
	2015		126			12
	2016		553			19
	2017		433			30
	2018		634			43
	2019 - 2023		2,456			414
		$	4,317		$	603

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Future Minimum Commitments Under All Operating Leases	'
	The Company leases various facilities under non-cancelable operating leases. As of December 31, 2013, the future minimum commitments under all operating leases are as follows (in thousands):
	Years ending December 31,
	2014	$	1,756
	2015		1,343
	2016		744
	2017		500
	2018		520
	Thereafter		447
		$	5,310

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Reserved Shares of Authorized but Unissued Common Stock	'
	As of December 31, 2013, the Company had reserved the following shares of authorized but unissued common stock:
	Stock option plans		6,069,781
	Stock purchase plans		369,878
	Warrants		4,482
			6,444,141
Schedule of Accumulated Other Comprehensive Income, Net of Taxes	'
	The following table shows the components of accumulated other comprehensive income, net of taxes, as of December 31, 2013, 2012 and 2011 (in thousands):
		December 31,
		2013			2012		2011
	Foreign currency translation adjustments	$	11,802		$	11,761	$	11,660
	Unrealized gains/losses on available-for-sale securities		3			68		(307	)
	Defined benefit pension plan adjustment		(118	)		—		—
		$	11,687		$	11,829	$	11,353

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Estimated Fair Value of Certain Stock-Based Awards Using Black-Scholes-Merton Valuation Model	'
	The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions:
			Years ended December 31,
	Stock options		2013		2012		2011
	Weighted-average expected term (years)		6.49		6.77		6.69
	Weighted-average volatility		74%		72%		71%
	Risk-free interest rate		1.08% – 1.86%		0.99% – 2.70%		1.62% – 2.92%
	Expected dividends		—  %		—  %		—  %
	Stock appreciation units
	Weighted-average expected term (years)		1.9		2.88		3.91
	Weighted-average volatility		58%		68%		74%
	Risk-free interest rate		0.10% – 0.63%		0.21% – 0.63%		0.36% – 2.42%
	Expected dividends		—  %		—  %		—  %
	ESPP
	Weighted-average expected term (years)		0.73		0.75		0.71
	Weighted-average volatility		48%		60%		68%
	Risk-free interest rate		0.09% – 0.16%		0.04% – 0.16%		0.04% – 0.23%
	Expected dividends		—  %		—  %		—  %
Summary of Stock Based Compensation Expense	'
	The following table summarizes the stock-based compensation expense recognized for the years ended December 31, 2013, 2012 and 2011 (in thousands)
		Years ended December 31,
		2013				2012			2011
	Cost of goods sold	$	924			$	800		$	503
	Research and development		2,060				1,744			1,033
	Sales and marketing		1,167				934			647
	General and administrative		1,585				1,299			925
		$	5,736			$	4,777		$	3,108
Summary of Stock Option and Restricted Stock Unit Activity	'
	The following table summarizes the Company’s stock option and restricted stock unit, or RSU, activity during the year ended December 31, 2013:
						Stock Options					Restricted Stock Units
		Shares				Number of			Weighted		Number of			Weighted
		Available				Shares			Average		Units			Average
		for Grant							Exercise					Grant Date
									Price					Fair Value
	Balance at December 31, 2012		382,668				2,773,887		$	5.87		924,823		$	5.84
	Authorized for issuance		2,569,115				—		$	—		—		$	—
	Granted		(2,420,870	)			1,732,130		$	5.92		688,740		$	6.96
	Exercised/Converted		—				(260,604	)	$	4.65		(345,359	)	$	8.26
	Forfeited		265,765				(141,959	)	$	7.35		(98,555	)	$	6.13
	Balance at December 31, 2013		796,678				4,103,454		$	5.92		1,169,649		$	6.42
Summary of Information about Stock Options Outstanding	'
	The following table summarizes information about stock options outstanding as of December 31, 2013:
		Options Outstanding
		Number of				Weighted			Weighted		Aggregate
		Shares				Average			Average		Intrinsic Value
						Exercise			Remaining		(in Thousands)
						Price			Contractual
									Term (Years)
	Vested and expected to vest		3,729,782			$	5.94			6.68	$	5,824
	Exercisable		1,935,519			$	5.88			4.93	$	3,618
Summary of Information about Restricted Stock Units Outstanding	'
	The following table summarizes information about RSUs outstanding as of December 31, 2013:
		Restricted Stock Units Outstanding
		Number of				Weighted			Weighted		Aggregate
		Shares				Average			Average		Intrinsic Value
						Grant Date			Remaining		(in Thousands)
						Fair Value			Contractual
									Term (Years)
	Vested and expected to vest		1,102,383			$	6.42			1.25	$	7,783
Summary of Stock Appreciation Unit Activity	'
	The following table summarizes the Company’s stock appreciation unit activity during the year ended December 31, 2013:
		Stock				Weighted-
		Appreciation				Average
		Units				Exercise
						Price
	Stock appreciation units outstanding as of December 31, 2012		212,534			$	7.07
	Stock appreciation units granted		275,000			$	5.4
	Stock appreciation units exercised		(29,263	)		$	4.36
	Stock appreciation units cancelled		(37,874	)		$	7.45
	Stock appreciation units outstanding as of December 31, 2013		420,397			$	6.13

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income (Loss) before Income Taxes	'
	The provision for income taxes is based upon the income (loss) before income taxes as follows (in thousands):
		Years Ended December 31,
		2013				2012				2011
	U.S. operations	$	(39,618	)		$	(25,599	)		$	(20,712	)
	Non-U.S. operations		6,483				9,291				6,477
		$	(33,135	)		$	(16,308	)		$	(14,235	)
Components of Provision for Income Taxes	'
	The components of the provision for income taxes consisted of the following (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Current
	Federal	$	7			$	(103	)		$	(257	)
	State		(11	)			—				—
	Foreign		(1,658	)			(1,119	)			(1,350	)
			(1,662	)			(1,222	)			(1,607	)
	Deferred
	Federal		—				—				—
	State		—				—				—
	Foreign		458				(142	)			452
	Total provision for income taxes from continuing operations		(1,204	)			(1,364	)			(1,155	)
	Benefit from (provision for) income taxes from discontinued operations		—				(114	)			318
	Total provision	$	(1,204	)		$	(1,478	)		$	(837	)
Difference in Provision for Income Taxes from Amount Obtained by Applying U.S. Federal Statutory Rate	'
	The provision for income taxes differs from the amount obtained by applying the U.S. federal statutory tax rate as follows (in thousands, except percentages):
		Years Ended December 31,
		2013				2012				2011
	Federal statutory rate		35	%			34	%			34	%
	Tax at federal statutory rate	$	11,597			$	5,599			$	4,840
	State taxes, net of federal benefit		1,058				967				397
	Nondeductible expenses		(260	)			96				138
	Stock-based compensation		(385	)			(529	)			(511	)
	Change in valuation allowance		(13,042	)			(7,308	)			(811	)
	Research and development		1,077				—				485
	Foreign rate differences		(2,129	)			(656	)			3,555
	Earn out adjustment not taxable		(359	)			132				438
	Foreign income inclusion		—				—				(5,140	)
	Change in prior year deferred balances		1,756				826				—
	Acquisition-related costs		(391	)			(491	)			(4,585	)
	Other		(126	)			—				39
		$	(1,204	)		$	(1,364	)		$	(1,155	)
Components of Deferred Income Tax Assets and Liabilities	'
	Deferred income tax assets and liabilities comprise the following (in thousands):
			December 31,
			2013				2012
	Deferred Tax Assets
	Net operating loss carryforwards		$	79,944			$	69,969
	Federal and state credits			9,357				7,747
	Reserves, accruals and other			6,091				5,498
	Fixed assets and intangibles			3,874				902
	Total deferred tax assets			99,266				84,116
	Valuation allowance			(91,045	)			(78,003	)
	Total deferred tax assets, net of valuation allowance			8,221				6,113
	Deferred tax liabilities
	Acquired intangibles			(6,910	)			(5,362	)
	Net deferred tax assets		$	1,311			$	751
	Reported as:
	Current deferred tax assets, included within prepaid expenses and other current assets		$	2,315			$	1,333
	Long-term deferred tax assets, included within other long-term assets			—				71
	Deferred income tax liabilities			(1,004	)			(653	)
	Net deferred tax assets		$	1,311			$	751
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
	Balance at December 31, 2010	$	5,101
	Gross increases for tax positions of prior years		119
	Gross increases for tax positions of current year		3,994
	Balance at December 31, 2011		9,214
	Gross increases for tax positions of prior years		70
	Releases for tax positions of prior years		(26	)
	Gross increases for tax positions of current year		2,735
	Balance at December 31, 2012		11,993
	Gross increases for tax positions of prior years		155
	Gross increases for tax positions of current year		4,361
	Reductions resulting from lapse of applicable statute of limitations		(57	)
	Balance at December 31, 2013	$	16,452

Segment_and_Geographic_Informa1

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2013
Revenue and Long-Lived Assets By Geographical Region	'
	The following tables set forth the Company’s revenue and asset information by geographic region. Revenue is classified based on the ship to location of 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. Long-lived assets in the table below comprise only property, plant and equipment (in thousands):
		Years ended December 31,
		2013		2012		2011
	Revenue:
	China	$	122,387	$	121,236	$	129,390
	United States		45,036		66,007		31,180
	Japan		25,451		14,771		15,085
	Rest of world		89,368		43,409		25,374
	Total consolidated revenue	$	282,242	$	245,423	$	201,029
		As of December 31,
		2013		2012
	Long-lived assets:
	China	$	32,993	$	31,922
	United States		20,150		21,706
	Japan		15,690		812
	Rest of world		18		—
	Total long-lived assets	$	68,851	$	54,440

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2013
Summary of Quarterly Financial Information	'
	The following tables set forth a summary of the Company’s quarterly financial information for each of the four quarters for the years ended December 31, 2013 and 2012.
	Year ended December 31, 2013	First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
			(In thousands, except share and per share data)
	Net revenues	$	56,063		$	74,990		$	76,814		$	74,375
	Gross profit		11,757			15,601			18,179			19,636
	Net loss		(12,240	)		(8,284	)		(9,363	)		(4,452	)
	Basic and diluted net loss per share	$	(0.40	)	$	(0.27	)	$	(0.30	)	$	(0.14	)
	Weighted averages shares used to compute basic and diluted net loss per share		30,574,032			30,779,730			31,184,958			31,450,916
	Year ended December 31, 2012	First			Second			Third			Fourth
		Quarter			Quarter			Quarter			Quarter
			(In thousands, except share and per share data)
	Net revenues	$	54,223		$	63,025		$	66,152		$	62,023
	Gross profit		11,406			15,188			20,616			14,050
	Income ( loss) from continuing operations		(11,778	)		(3,656	)		723			(2,961	)
	Income (loss) from discontinued operations		170			—			—			(28	)
	Net income (loss)		(11,608	)		(3,656	)		723			(2,989	)
	Basic and diluted net income (loss) per share:
	Continuing operations	$	(0.47	)	$	(0.13	)	$	0.02		$	(0.10	)
	Discontinued operations	$	0.01		$	—		$	—		$	—
	Net income (loss)	$	(0.46	)	$	(0.13	)	$	0.02		$	(0.10	)
	Weighted averages shares used to compute basic net income (loss) per share		24,870,684			28,402,929			30,215,144			30,414,735
	Weighted averages shares used to compute diluted net income (loss) per share		24,870,684			28,402,929			30,611,304			30,414,735

The_Company_and_Basis_of_Prese2

The Company and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2012
	USD ($)	CNY	USD ($)	USD ($)		Private Placement
						Embedded Derivative Financial Instruments
						USD ($)
Organization And Basis Of Presentation [Line Items]	'	'	'	'		'
Other non-current liability	'	'	'	'		$5,000,000
Additional paid-in capital	'	'	447,467,000	438,858,000	[1]	4,900,000
Penalty payment derivative	'	'	239,000	138,000		'
Sale of equity interest	100.00%	100.00%	'	'		'
Discontinued operation, total consideration	$2,100,000	13,000,000	'	'		'
[1]	Revised

Effect_of_Reclassification_on_

Effect of Reclassification on Balance Sheet (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other noncurrent liabilities	$7,987	$1,862	[1]
Additional paid-in capital	447,467	438,858	[1]
Previously Reported	'	'
Other noncurrent liabilities	'	1,724
Redeemable common stock	'	5,000
Additional paid-in capital	'	$433,996
[1]	Revised

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Restricted cash	$2,138,000	$2,626,000	[1]	'
Goodwill impairment charges	0	0		13,106,000
Restricted stock conversion basis	'One-for-one basis	'		'
Net gains (losses) resulting from foreign exchange transactions	$900,000	($200,000)		($100,000)
Land use rights	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Intangible assets useful life	'45 years	'		'
Minimum	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Intangible assets useful life	'5 years	'		'
Product warranty period	'1 year	'		'
Maximum	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Intangible assets useful life	'7 years	'		'
Product warranty period	'2 years	'		'
Sales Revenue, Net	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	'	'		51.00%
Accounts Receivable | Credit Concentration Risk One	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	14.00%	42.00%		'
Accounts Receivable | Credit Concentration Risk Two	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	10.00%	16.00%		'
Customer 1 | Sales Revenue, Net	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	27.00%	36.00%		'
Customer 2 | Sales Revenue, Net	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	16.00%	16.00%		'
Customer 3 | Sales Revenue, Net	'	'		'
Summary Of Significant Accounting Policies [Line Items]	'	'		'
Concentration risk percentage	14.00%	15.00%		'
[1]	Revised

Estimated_Useful_Lives_of_Prop

Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2013
Buildings | Minimum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'20 years
Buildings | Maximum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'30 years
Machinery and equipment | Minimum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'2 years
Machinery and equipment | Maximum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'7 years
Furniture, fixtures and office equipment | Minimum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'3 years
Furniture, fixtures and office equipment | Maximum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'5 years
Software | Minimum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'5 years
Software | Maximum	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives	'7 years
Leasehold improvements	'
Property Plant And Equipment [Line Items]	'
Property, plant and equipment, useful lives description	'life of the asset or lease term, if shorter

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Detail)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2012
	USD ($)	CNY	Segment, Discontinued Operations	Segment, Discontinued Operations
			USD ($)	CNY
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]	'	'	'	'
Sale of equity interest	100.00%	100.00%	100.00%	100.00%
Discontinued operation, total consideration	$2.10	13	$2.10	13
Gain (loss) on sale of business	'	'	$0.60	'
Closing date of agreement for sale of business	'	'	13-Mar-12	13-Mar-12

Revenue_and_Components_of_Net_

Revenue and Components of Net Income Related to Discontinued Operations (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]	'	'	'	'
Benefit from (provision for) income taxes	'	'	($114)	$318
Net income from discontinued operations	-28	170	142	636
Segment, Discontinued Operations	'	'	'	'
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]	'	'	'	'
Revenue	'	'	590	5,085
Income from discontinued operations before income taxes	'	'	256	318
Benefit from (provision for) income taxes	'	'	-114	318
Net income from discontinued operations	'	'	$142	$636

Summary_of_Unrealized_Gains_an

Summary of Unrealized Gains and Losses Related to Cash Equivalents and Investments in Marketable Securities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	$17,924	$64,246
Gross Unrealized Gains	8	67
Gross Unrealized Losses	-5	-1
Fair Value	17,927	64,312
Cash and Cash Equivalents | Money Market Funds	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	11	11
Gross Unrealized Gains	'	'
Gross Unrealized Losses	'	'
Fair Value	11	11
Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	17,913	64,235
Gross Unrealized Gains	8	67
Gross Unrealized Losses	-5	-1
Fair Value	17,916	64,301
Short-term Investments | Money Market Funds	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	4,577	7,259
Gross Unrealized Gains	'	'
Gross Unrealized Losses	'	'
Fair Value	4,577	7,259
Short-term Investments | Corporate Bond Securities	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	6,708	23,151
Gross Unrealized Gains	3	43
Gross Unrealized Losses	-5	-1
Fair Value	6,706	23,193
Short-term Investments | U.S. Federal Agencies	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	'	27,241
Gross Unrealized Gains	'	10
Gross Unrealized Losses	'	'
Fair Value	'	27,251
Short-term Investments | Foreign Bonds and Notes	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	4,827	4,682
Gross Unrealized Gains	5	14
Gross Unrealized Losses	'	'
Fair Value	4,832	4,696
Short-term Investments | Variable rate demand notes	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	1,801	1,902
Gross Unrealized Gains	'	'
Gross Unrealized Losses	'	'
Fair Value	$1,801	$1,902

Maturities_of_Investments_Deta

Maturities of Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule Of Investments [Line Items]	'	'
Less than 1 year	$14,118	$51,861
Due in 1 to 2 years	2,008	10,550
Due in 2 to 5 years	'	'
Due after 5 years	1,801	1,901
Total	$17,927	$64,312

Cash_Cash_Equivalents_and_Shor2

Cash, Cash Equivalents and Short-Term Investments - Additional information (Detail) (USD $)	12 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011
				Ignis ASA
Schedule Of Investments [Line Items]	'	'	'	'
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	$0	$0	'	'
Proceeds from sale of an unconsolidated investee	'	'	21,288	21,288
Gain on sale of an unconsolidated investee, net of direct cost	'	'	$13,867	$13,867

Fair_Value_of_Financial_Assets

Fair Value of Financial Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Money Market Funds	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	$4,588	$7,270
Money Market Funds | Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	4,588	7,270
Corporate Bond Securities	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	6,706	23,193
Corporate Bond Securities | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	6,706	23,193
U.S. Federal Agencies	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	27,251
U.S. Federal Agencies | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	27,251
Foreign Bonds and Notes	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	4,832	4,696
Foreign Bonds and Notes | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	4,832	4,696
Variable rate demand notes	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	1,801	1,902
Variable rate demand notes | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	1,801	1,902
Mutual Funds Held in Rabbi Trust	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	442	188
Mutual Funds Held in Rabbi Trust | Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	$442	$188

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Investments [Line Items]	'	'	'
Goodwill impairment charges	$0	$0	$13,106,000
Carrying value of the Company’s borrowings	34,475,000	22,167,000	'
Business Combinations Member	'	'	'
Schedule Of Investments [Line Items]	'	'	'
Carrying value of the Company’s borrowings	9,975,000	'	'
Notes Payable to Banks | Libor Plus Rate	'	'	'
Schedule Of Investments [Line Items]	'	'	'
Fair value of the Company’s borrowings	'	21,200,000	'
Carrying value of the Company’s borrowings	'	22,200,000	'
Notes Payable to Banks | Business Combinations Member	'	'	'
Schedule Of Investments [Line Items]	'	'	'
Fair value of the Company’s borrowings	10,000,000	'	'
Carrying value of the Company’s borrowings	9,975,000	'	'
Cash and Cash Equivalents | Bank Time Deposits | Fair Value, Inputs, Level 2	'	'	'
Schedule Of Investments [Line Items]	'	'	'
Assets, fair value	$6,500,000	$14,700,000	'

Fair_Value_of_Financial_Liabil

Fair Value of Financial Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Liabilities, fair value	$1,985	$959
Penalty payment derivative	239	138
Fair Value, Inputs, Level 3	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Liabilities, fair value	1,985	959
Penalty payment derivative	$239	$138

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Loss per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:	'	'	'	'	'	'	'	'	'	'	'
Loss from continuing operations	'	'	'	'	($2,961)	$723	($3,656)	($11,778)	($34,339)	($17,672)	($15,390)
Accretion of redeemable convertible preferred stock	'	'	'	'	'	'	'	'	'	'	-7
Deemed dividend on beneficial conversion of Series X redeemable convertible preferred stock	'	'	'	'	'	'	'	'	'	'	-17,049
Loss from continuing operations attributable to NeoPhotonics Corporation common stockholders	'	'	'	'	'	'	'	'	-34,339	-17,672	-32,446
Income from discontinued operations	'	'	'	'	-28	'	'	170	'	142	636
Loss attributable to NeoPhotonics Corporation common stockholders	'	'	'	'	'	'	'	'	($34,339)	($17,530)	($31,810)
Denominator:	'	'	'	'	'	'	'	'	'	'	'
Basic and diluted weighted average shares used to compute net loss per share attributable to NeoPhotonics Corporation common stockholders	31,450,916	31,184,958	30,779,730	30,574,032	'	'	'	'	31,000,325	28,529,849	22,359,802
Basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations	'	'	'	'	($0.10)	$0.02	($0.13)	($0.47)	($1.11)	($0.62)	($1.45)
Discontinued operations	'	'	'	'	'	'	'	$0.01	'	'	$0.03
Net income (loss)	($0.14)	($0.30)	($0.27)	($0.40)	($0.10)	$0.02	($0.13)	($0.46)	($1.11)	($0.62)	($1.42)

Potentially_Dilutive_Securitie

Potentially Dilutive Securities Excluded From Computation of Diluted Net Loss per Share Attributable to Common Stockholders (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	5,680,914	4,178,784	3,658,775
Employee stock options	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	4,103,454	2,773,887	2,631,524
Restricted Stock Units	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	1,169,649	924,823	517,445
Employee stock purchase plan	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	403,329	475,592	505,324
Common Stock Warrants	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	4,482	4,482	4,482

Business_Combination_Additiona

Business Combination - Additional Information (Detail)

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

Mar. 29, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Mar. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Oct. 12, 2011

Dec. 31, 2011

Oct. 31, 2011

Oct. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

USD ($)

USD ($)

USD ($)

Pro Forma

Pro Forma

Minimum

Maximum

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

Santur Corporation

Santur Corporation

Santur Corporation

Santur Corporation

Santur Corporation

Santur Corporation

Santur Corporation

Notes Payable

Notes Payable

Notes Payable

Change in value of inventory as a result of acquisition accounting

Change in value of inventory as a result of acquisition accounting

USD ($)

USD ($)

Pro Forma

Pro Forma

Customer relationships

Minimum

Minimum

Maximum

Maximum

USD ($)

USD ($)

Fair Value Adjustment to Fixed Assets

Fair Value Adjustment to Inventory

Developed Technology

Customer relationships

In Process Research And Development

NeoPhotonics Semiconductor

Notes Payable To be paid in three equal installments

Notes Payable To be paid in three equal installments

USD ($)

USD ($)

One Time Charges and Amortization of Fair Value Adjustments

One Time Charges and Amortization of Fair Value Adjustments

Developed Technology

Developed Technology

USD ($)

USD ($)

Project

USD ($)

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

USD ($)

USD ($)

USD ($)

JPY (¥)

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total consideration

'

'

'

'

'

'

'

'

$24,258,000

'

'

'

'

'

'

'

'

$47,196,000

'

'

'

'

'

'

'

'

'

Cash consideration paid

'

13,128,000

'

38,986,000

'

'

'

'

13,128,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities assumed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11,130,000

11,130,000

1,050,000,000

Withheld and placed into escrow

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

6,000,000

'

'

'

'

'

'

'

'

'

Notes Payable, Number of Installments

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of notes unpaid balance per year

'

'

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition-related transaction costs

'

5,406,000

1,447,000

989,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

'

40,400,000

-1,900,000

-4,400,000

'

'

'

'

'

'

5,800,000

'

'

'

'

'

'

'

'

Goodwill

'

0

0

'

'

'

'

'

0

'

'

'

'

'

'

'

'

8,783,000

'

'

'

'

'

'

'

'

'

Property, plant and equipment, useful lives

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years

'

'20 years

'

'

'

'

'

'

'

'

'

'

'

Royalty rate on total revenue

'

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intangible assets useful life

'

'

'

'

'

'

'5 years

'7 years

'

'

'

'

'6 years

'

'4 years

'

'5 years

'

'

'

'

'5 years

'5 years

'5 years

'

'

'

Weighted average amortization period for intangible assets

'5 years 4 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost of goods sold

'

217,069,000

184,163,000

150,944,000

-3,200,000

4,300,000

'

'

'

'

-1,800,000

-3,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration paid

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44,396,000

'

'

'

'

'

'

'

'

'

Additional Contingent payable amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,500,000

'

'

'

'

'

'

'

'

'

Increase in value of assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,800,000

200,000

'

'

'

'

'

'

Number of Projects

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

Operating loss from acquired entity

'

($33,673,000)

($16,907,000)

($28,466,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$13,800,000

'

'

'

'

'

'

'

'

Acquisition_Accounting_and_Tan

Acquisition Accounting and Tangible and Intangible Assets Acquired (Detail) (USD $)

12 Months Ended

1 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2012

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Oct. 12, 2011

Oct. 12, 2011

Oct. 12, 2011

Oct. 12, 2011

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

Santur Corporation

Santur Corporation

Santur Corporation

Santur Corporation

Developed Technology

Customer relationships

Other Liability

Notes Payable

Developed Technology

Customer relationships

In Process Research And Development

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Cash paid

$13,128,000

$38,986,000

'

$13,128,000

'

'

'

'

'

'

'

'

Notes payable

'

'

'

'

'

'

'

11,130,000

'

'

'

'

Total consideration

'

'

'

24,258,000

'

'

'

'

47,196,000

'

'

'

Pension and retirement obligations

'

'

'

'

'

'

6,471,000

'

'

'

'

'

Other compensation-related liabilities

'

'

'

'

'

'

1,083,000

'

'

'

'

'

Other current liabilities

'

'

'

'

'

'

1,265,000

'

'

'

'

'

Liabilities assumed

'

'

'

'

'

'

8,819,000

'

'

'

'

'

Inventory

'

'

'

13,309,000

'

'

'

'

7,578,000

'

'

'

Other current assets

'

'

'

35,000

'

'

'

'

'

'

'

'

Land, property, plant and equipment

'

'

'

14,433,000

'

'

'

'

13,500,000

'

'

'

Intangible assets acquired

'

'

'

'

2,120,000

3,180,000

'

'

'

11,800,000

5,000,000

370,000

Fair Value of assets acquired

'

'

'

33,077,000

'

'

'

'

'

'

'

'

Cash consideration paid

'

'

'

'

'

'

'

'

44,396,000

'

'

'

Fair value of contingent consideration

'

'

'

'

'

'

'

'

2,800,000

'

'

'

Net tangible assets acquired

'

'

'

'

'

'

'

'

21,243,000

'

'

'

Net tangible and intangible assets acquired

'

'

'

'

'

'

'

'

38,413,000

'

'

'

Goodwill

$0

'

$0

$0

'

'

'

'

$8,783,000

'

'

'

Pro_forma_Information_for_Busi

Pro forma Information for Business Acquisition (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	NeoPhotonics Semiconductor	NeoPhotonics Semiconductor	Santur Corporation
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]	'	'	'
Revenue	$294,933	$305,286	$236,449
Net loss	-23,340	-11,014	-29,352
Basic and diluted net loss per share	($0.75)	($0.39)	($2.08)
Net loss attributable to NeoPhotonics Corporation	'	'	-29,352
Net loss attributable to NeoPhotonics Corporation common stockholders	'	'	($46,408)

Net_Assets_Acquired_Detail

Net Assets Acquired (Detail) (Santur Corporation, USD $)	Oct. 12, 2011
In Thousands, unless otherwise specified
Santur Corporation	'
Business Acquisition [Line Items]	'
Cash and cash equivalents	$5,410
Accounts receivable, net	10,253
Inventory	7,578
Prepaid and other current assets.	1,329
Land, property, plant and equipment	13,500
Other non-current assets	453
Accounts payable	-8,371
Other accrued liabilities	-8,798
Lease obligation	-111
Total net tangible assets acquired	$21,243

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Companies
	Times
Goodwill [Line Items]	'	'	'
Goodwill impairment charges	$0	$0	$13,106
Goodwill	$0	$0	'
Discount rate of fair value	18.00%	'	'
Fair value growth rate	5.00%	'	'
Fair value control premium	40.00%	'	'
Number of years take in to account	'3 years 6 months	'	'
Projected net cash flows period	'11 years	'	'
Number of Transactions	13	'	'
Number of companies for public company analysis	11	'	'

Weighted_Analyses_of_Measuring

Weighted Analyses of Measuring Fair Value of Reporting Unit (Detail)	12 Months Ended
	Dec. 31, 2013
Fair Value [Line Items]	'
Discounted cash flow	16.70%
Market capitalization	50.00%
Guideline public company	16.70%
Guideline transactions	16.70%

Purchased_Intangible_Assets_De

Purchased Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	$51,884	$46,379
Accumulated Amortization	-36,879	-32,166
Net Assets	15,005	14,213	[1]
Technology and patents	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	34,524	32,176
Accumulated Amortization	-25,931	-22,869
Net Assets	8,593	9,307
Customer relationships	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	15,004	11,898
Accumulated Amortization	-9,732	-8,148
Net Assets	5,272	3,750
Leasehold interest	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	1,406	1,355
Accumulated Amortization	-266	-241
Net Assets	1,140	1,114
Non-compete agreements	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	950	950
Accumulated Amortization	-950	-908
Net Assets	'	$42
[1]	Revised

Amortization_Expense_of_Compan

Amortization Expense of Company's Purchased Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite Lived Intangible Assets [Line Items]	'	'	'
Cost of goods sold	$2,543	$2,472	$598
Operating expenses	1,532	1,316	994
Total	$4,075	$3,788	$1,592

Estimated_Future_Amortization_

Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Expected Amortization Expense [Line Items]	'	'
2014	$4,402	'
2015	4,386	'
2016	3,640	'
2017	793	'
2018	580	'
Thereafter	1,204	'
Net Assets	$15,005	$14,213	[1]
[1]	Revised

Accounts_Receivable_Net_Detail

Accounts Receivable, Net (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts Notes And Loans Receivable [Line Items]	'	'
Accounts receivable	$57,010	$66,338
Trade notes receivable	8,054	4,979
Allowance for doubtful accounts	-531	-963
Accounts receivable, Net ,Total	$64,533	$70,354	[1]
[1]	Revised

Movement_in_Allowance_for_Doub

Movement in Allowance for Doubtful Accounts (Detail) (Allowance for Doubtful Accounts, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts	'	'	'
Valuation And Qualifying Accounts Disclosure [Line Items]	'	'	'
Beginning Balance	($963)	($506)	($1,582)
Provision for bad debt	253	-457	-196
Write-offs, net of recoveries	179	'	1,272
Ending Balance	($531)	($963)	($506)

Inventory_Detail

Inventory (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory [Line Items]	'	'
Raw materials	$26,379	$19,038
Work in process	14,341	8,940
Finished goods	24,188	15,815
Inventories	$64,908	$43,793	[1]
[1]	Revised

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Components [Line Items]	'	'	'
Finished goods, at vendor managed inventory locations	$5.40	$4.50	'
Depreciation expense	$16.30	$12.40	$10.80

Property_Plant_and_Equipment_N

Property, Plant and Equipment, Net (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]	'	'
Land	$3,167	'
Buildings	23,194	16,484
Machinery and equipment	104,287	92,139
Furniture, fixtures, software and office equipment	11,441	8,300
Leasehold improvements	7,837	4,373
Property, Plant and Equipment, Gross, Total	149,926	121,296
Less: Accumulated depreciation	-81,075	-66,856
Property, plant and equipment, net	$68,851	$54,440	[1]
[1]	Revised

Accrued_and_Other_Current_Liab

Accrued and Other Current Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts Payable And Accrued Liabilities [Line Items]	'	'
Employee-related	$12,297	$12,293
Other	11,346	7,666
Accrued and other current liabilities	$23,643	$19,959	[1]
[1]	Revised

Summary_of_Movement_in_Warrant

Summary of Movement in Warranty Accrual (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Product Liability Contingency [Line Items]	'	'		'
Beginning balance	$1,072	$1,443	[1]	$299
Warranty accruals	1,514	385		393
Assumed warranty from acquisitions	135	'		999
Settlements and adjustments	-984	-756		-248
Ending balance	$1,737	$1,072		$1,443	[1]
[1]	Included within the ending balance is an accrual of $0.3 million relating to a specific part, for which the liability was assumed as part of the acquisition of Santur. The Company did not experience any claims for this product after October 2011 and it believed warranty claims were remote. Therefore, the Company released this obligation in the fourth quarter of 2012.

Summary_of_Movement_in_Warrant1

Summary of Movement in Warranty Accrual (Parenthetical) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
In Thousands, unless otherwise specified
Product Liability Contingency [Line Items]	'	'	'		'
Business acquisition warranty liability	$1,737	$1,072	$1,443	[1]	$299
Santur Corporation	'	'	'		'
Product Liability Contingency [Line Items]	'	'	'		'
Business acquisition warranty liability	'	'	$300		'
[1]	Included within the ending balance is an accrual of $0.3 million relating to a specific part, for which the liability was assumed as part of the acquisition of Santur. The Company did not experience any claims for this product after October 2011 and it believed warranty claims were remote. Therefore, the Company released this obligation in the fourth quarter of 2012.

Other_Noncurrent_Liabilities_D

Other Noncurrent Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Non Current Liabilities [Line Items]	'	'
Pension and other employee-related	$6,206	$188
Penalty payment derivative	239	138
Other	1,542	1,536
Other noncurrent liabilities	$7,987	$1,862	[1]
[1]	Revised

Restructuring_Additional_Infor

Restructuring - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2011
	Facility			United States	China	Cost of Goods Sold	Restructuring	Severance
				Employee	Employee
Restructuring Cost And Reserve [Line Items]	'	'	'	'	'	'	'	'
Number of facilities closed	1	'	'	'	'	'	'	'
Restructuring charges	$775	$68	$1,297	'	'	$775	$1,500	$1,297
Number of employees reduced	'	'	'	37	43	'	'	'

Summary_of_Restructuring_Activ

Summary of Restructuring Activity (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2012	'
Restructuring costs incurred in 2013	1,474
Cash payments	-1,268
Non-cash settlements and other	71
Restructuring obligations, December 31, 2013	277
Severance	'
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2012	'
Restructuring costs incurred in 2013	699
Cash payments	-699
Non-cash settlements and other	'
Restructuring obligations, December 31, 2013	'
Facilities	'
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2012	'
Restructuring costs incurred in 2013	318
Cash payments	-178
Non-cash settlements and other	71
Restructuring obligations, December 31, 2013	211
Contract Termination	'
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2012	'
Restructuring costs incurred in 2013	457
Cash payments	-391
Non-cash settlements and other	'
Restructuring obligations, December 31, 2013	$66

Components_of_Debt_Obligations

Components of Debt, Obligations, Weighted Average Interest Rate and Additional Fair Value Information Relating to Outstanding Debt Instruments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Notes payable, carrying amount	$9,738	$12,003	[1]
Long-term debt, carrying amount	34,475	22,167
Current portion of long-term debt, carrying amount	-10,325	-5,000	[1]
Total long-term debt, net of current portion, carrying amount	24,150	17,167	[1]
NeoPhotonics Semiconductor	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, carrying amount	9,975	'
Weighted Average Interest Rate	1.50%	'
Bank borrowings	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, carrying amount	$24,500	$22,167
Weighted Average Interest Rate	2.92%	2.20%
[1]	Revised

Debt_Additional_Information_De

Debt - Additional Information (Detail)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Mar. 29, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Mar. 29, 2013

Mar. 29, 2013

Mar. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

31-May-14

19-May-14

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

23-May-14

23-May-14

31-May-14

USD ($)

USD ($)

Credit Facility

Credit Facility

Credit Facility

Credit Facility

NeoPhotonics Semiconductor

Series of Individually Immaterial Business Acquisitions

Series of Individually Immaterial Business Acquisitions

Series of Individually Immaterial Business Acquisitions

Notes Payable

Notes Payable

Notes Payable

Revolving Credit Facility

Term Loan

Term Loan

Term Loan

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

China

China

China

China

China

USD ($)

USD ($)

Libor Plus Rate

Credit Facility Base Rate

USD ($)

Libor Plus Rate

Credit Facility

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

Libor Plus Rate

USD ($)

Libor Plus Rate

Credit Facility Base Rate

USD ($)

USD ($)

Credit Facility

Credit Facility

Term Loan

Term Loan

USD ($)

USD ($)

Subsequent Event

Subsequent Event

Subsequent Event

Libor Plus Rate

USD ($)

Notes Payable To be paid in three equal installments

Notes Payable To be paid in three equal installments

Libor Plus Rate

Credit Facility Base Rate

Libor Plus Rate

Credit Facility Base Rate

USD ($)

CNY

USD ($)

USD ($)

JPY (¥)

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted cash

$2,138,000

$2,626,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,400,000

'

'

'

'

'

'

'

'

'

'

'

Bank Acceptances Executed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

Credit facility outstanding balance

'

'

'

'

'

'

'

14,200,000

'

'

'

'

'

'

24,500,000

'

'

'

'

'

'

'

'

'

0

0

'

'

'

Number of short-term line of credit facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

Notes payable

'

'

'

'

'

'

'

'

'

'

11,130,000

11,130,000

1,050,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Obligation bear interest

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.00%

7.00%

'

Revolving line of credit, maximum borrowing capacity

'

'

0

8,000,000

'

'

'

'

'

'

'

'

'

'

28,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility remaining borrowing capacity

'

'

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate description

'

'

'

'

'

'

'

'

'Which bore interest at a rate of LIBOR plus 2%.

'

'

'

'

'borrowings bear interest at an interest rate option of a base rate as defined in the agreement plus 1.5% or LIBOR plus 2.5%.

'Borrowings under the term loan bear interest at an interest rate option of a base rate as defined in the agreement plus 1.75% or LIBOR plus 2.75%.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility, marginal interest rate

'

'

'

'

2.50%

1.50%

'

'

'

2.00%

'

'

'

'

'

2.75%

1.75%

'

'

'

2.75%

1.75%

3.00%

2.00%

'

'

'

'

'

Line of credit facility, interest rate

'

'

'

'

2.67%

'

'

'

'

'

'

'

'

'

'

2.92%

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility, expiration date

'

'

'2016-03

'

'

'

'

'

'

'

'

'

'

'

'2017-06

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant issued

4,482

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price of warrant

$29

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Covenant Compliance

'The Company’s credit agreement requires the maintenance of specified financial covenants, including a debt to EBITDA ratio and liquidity ratios. The agreement also restricts the Company’s ability to incur additional debt or to engage in specified transactions, restricts the payment of dividends and is secured by substantially all of its U.S. assets, other than intellectual property assets. The Company was not in compliance with the debt to EBITDA covenant at December 31, 2013 and obtained a waiver from the bank with respect to such noncompliance.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in margin

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

Compensating Balance, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21,100,000

'

'

'

'

'

'

'

'

'

'

Working capital Loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$8,000,000

50,000,000

'

Frequency of periodic payment on loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Monthly

'Monthly

'

Due date of the principal

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23-Nov-14

23-Nov-14

'

[1]

Revised

Maturities_of_Long_Term_debt_O

Maturities of Long -Term debt Outstanding (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule Of Short And Long Term Debt [Line Items]	'	'
2014	$10,325	'
2015	10,325	'
2016	10,325	'
2017	3,500	'
Long-term debt, carrying amount	$34,475	$22,167

Japan_Defined_Benefit_Pension_2

Japan Defined Benefit Pension Plans - Additional Information (Detail) (USD $)	Mar. 29, 2013	Dec. 31, 2013	Mar. 29, 2013	Feb. 28, 2014	Mar. 31, 2014
	CompensationPlan	DBCPP	DBCPP	DBCPP	DBCPP
				Subsequent Event	Subsequent Event
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'
Number of Defined Benefit Pension Plans	2	'	'	'	'
Plan assets	'	$2,072,000	$2,037,000	$2,000,000	'
Receivable from LAPIS	'	'	'	300,000	'
Employer contributions	'	585,000	'	15,000	'
Defined Benefit Plan, Curtailments	'	'	'	'	$100,000

Funded_Status_of_Plans_Detail

Funded Status of Plans (Detail) (USD $)	9 Months Ended
	Dec. 31, 2013	Mar. 29, 2013
RAP	'	'
Change in projected benefit obligation:	'	'
Projected benefit obligation, March 29, 2013	'	$5,795,000
Service cost	175,000	'
Interest cost	39,000	'
Benefits paid	-140,000	'
Actuarial (gain)/loss	177,000	'
Currency translation adjustment	-600,000	'
Projected benefit obligation, end of period	5,446,000	5,795,000
Amounts recognized in consolidated balance sheets:	'	'
Accrued and other current liabilities	115,000	'
Other noncurrent liabilities	5,331,000	'
Amount recognized in accumulated other comprehensive loss:	'	'
Defined benefit pension plans adjustment	177,000	'
Accumulated benefit obligation, end of period	4,929,000	'
DBCPP	'	'
Change in projected benefit obligation:	'	'
Projected benefit obligation, March 29, 2013	'	2,706,000
Service cost	78,000	'
Interest cost	18,000	'
Actuarial (gain)/loss	-14,000	'
Currency translation adjustment	-280,000	'
Projected benefit obligation, end of period	2,508,000	2,706,000
Change in plan assets:	'	'
Plan assets at fair value, March 29, 2013	'	2,037,000
Employer contributions	585,000	'
Actual return on plan assets	-304,000	'
Currency translation adjustment	-246,000	'
Plan assets at calculated amount, end of period	2,072,000	2,037,000
Amounts recognized in consolidated balance sheets:	'	'
Other noncurrent liabilities	436,000	'
Amount recognized in accumulated other comprehensive loss:	'	'
Defined benefit pension plans adjustment	319,000	'
Accumulated benefit obligation, end of period	$2,508,000	'

Periodic_Pension_Cost_Detail

Periodic Pension Cost (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
RAP	'
Defined Benefit Plan Disclosure [Line Items]	'
Service cost	$175
Interest cost	39
Net periodic pension costs	214
DBCPP	'
Defined Benefit Plan Disclosure [Line Items]	'
Service cost	78
Interest cost	18
Expected return on plan assets	-30
Net periodic pension costs	$66

Projected_and_Accumulated_Bene

Projected and Accumulated Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2013
RAP	'
Defined Benefit Plan Disclosure [Line Items]	'
Discount rate	0.70%
Salary increase rate	4.50%
DBCPP	'
Defined Benefit Plan Disclosure [Line Items]	'
Discount rate	1.60%
Expected return on plan assets	1.70%
Salary increase rate	1.20%

Estimated_Future_Benefit_Payme

Estimated Future Benefit Payments Under Plans (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
RAP	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	$115
2015	126
2016	553
2017	433
2018	634
2019 - 2023	2,456
Total estimated future benefit payments	4,317
DBCPP	'
Defined Benefit Plan Disclosure [Line Items]	'
2014	85
2015	12
2016	19
2017	30
2018	43
2019 - 2023	414
Total estimated future benefit payments	$603

Future_Minimum_Commitments_Und

Future Minimum Commitments Under All Operating Leases (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leased Assets [Line Items]	'
2014	$1,756
2015	1,343
2016	744
2017	500
2018	520
Thereafter	447
Operating Leases, Future Minimum Payments Due, Total	$5,310

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	5-May-10	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Defendant
Commitments And Contingencies Disclosure [Line Items]	'	'	'	'
Rent expense	'	$2,200,000	$2,300,000	$1,900,000
Number of defendants	4	'	'	'
Agreement period not to refile claims	'90 days	'	'	'
Probable or reasonably possible loss	'	0	'	'
Total outstanding purchase obligations	'	40,000,000	'	'
Year of acquisition	'	12-Oct-11	'	'
Adjustment to fair value of contingent consideration	'	1,026,000	-554,000	-1,287,000
Estimated fair value of contingent consideration amount	'	1,985,000	959,000	'
Fair Value, Inputs, Level 3	'	'	'	'
Commitments And Contingencies Disclosure [Line Items]	'	'	'	'
Estimated fair value of contingent consideration amount	'	1,985,000	959,000	'
Santur Corporation	'	'	'	'
Commitments And Contingencies Disclosure [Line Items]	'	'	'	'
Amount of indemnification claims by the company	'	3,900,000	'	'
Adjustment to fair value of contingent consideration	'	1,026,000	'	'
Santur Corporation | Fair Value, Inputs, Level 3	'	'	'	'
Commitments And Contingencies Disclosure [Line Items]	'	'	'	'
Estimated fair value of contingent consideration amount	'	1,985,000	959,000	1,500,000
Scenario, Plan | Santur Corporation	'	'	'	'
Commitments And Contingencies Disclosure [Line Items]	'	'	'	'
Amount received from escrow ,net	'	$1,900,000	'	'

Reserved_Shares_of_authorized_

Reserved Shares of authorized but Unissued Common Stock (Detail)	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Common stock	6,444,141
Common Stock Warrants	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Common stock	4,482
Employee stock options	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Common stock	6,069,781
Employee stock purchase plan	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'
Common stock	369,878

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

1 Months Ended

Feb. 28, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Apr. 27, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Apr. 27, 2012

Apr. 27, 2012

Apr. 27, 2012

Feb. 28, 2011

Feb. 28, 2011

Private Placement

Private Placement

Private Placement

Private Placement

Private Placement

Private Placement

Private Placement

Series 1, 2 and 3 redeemable convertible preferred stock

Series X redeemable convertible preferred stock

Embedded Derivative Financial Instruments

Minimum

Performance Guarantee

Capital Addition Purchase Commitments

Research and Development Arrangement

Scenario, Plan

Class Of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock, shares

8,625,000

'

'

'

4,970,000

'

'

'

'

'

'

'

'

Issuance of common stock upon initial public offering, per share

$11

'

'

$11

$8

'

'

'

'

'

'

'

'

Net cash proceeds from initial public offerings

$88,200,000

'

'

$86,412,000

'

'

'

'

'

'

'

'

'

Conversion of preferred stock into shares of common stock (in shares)

'

'

'

'

'

'

'

'

'

'

'

6,639,513

7,398,976

Preferred stock conversion rate

'

'

'

'

'

'

'

'

'

'

'

'1-for-1

'400-for-1

Proceeds from issuance of common stock, net of issuance costs

'

'

39,636,000

'

39,800,000

'

'

'

'

'

'

'

'

Common Stock Transfer Restriction Period

'

'

'

'

'2 years

'

'

'

'

'

'

'

'

Other non-current liability

'

'

'

'

'

'

5,000,000

'

30,000,000

15,000,000

15,000,000

'

'

Percentage of investment obligation that must be spent inside Russia

'

'

'

'

80.00%

'

'

'

'

'

'

'

'

Targeted expansion completion date

'

'

'

'

'

31-Jul-14

'

'

'

'

'

'

'

Extended date for achievement of Investment Obligation

'

'

'

'

'

31-Mar-15

'

'

'

'

'

'

'

Expected aggregate revenue from sales of its products in the Russian Federation

'

'

'

'

'

'

'

26,800,000

'

'

'

'

'

Additional paid-in capital

'

447,467,000

438,858,000

[1]

'

'

'

4,900,000

'

'

'

'

'

'

Penalty payment derivative

'

239,000

138,000

'

'

'

'

'

'

'

'

'

'

Accumulated deficit subject to restriction

'

$6,500,000

'

'

'

'

'

'

'

'

'

'

'

Accumulated profits

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

[1]

Revised

Schedule_of_Accumulated_Other_

Schedule of Accumulated Other Comprehensive Income, Net of Taxes (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
In Thousands, unless otherwise specified
Accumulated Other Comprehensive Income Loss [Line Items]	'	'		'
Foreign currency translation adjustments	$11,802	$11,761		$11,660
Unrealized gains/losses on available-for-sale securities	3	68		-307
Defined benefit pension plan adjustment	-118	'		'
Accumulated other comprehensive income, Net of tax	$11,687	$11,829	[1]	$11,353
[1]	Revised

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 28, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Feb. 28, 2011

Dec. 31, 2013

Stock Appreciation Rights (SARs)

Employee stock options

Employee stock options

Employee stock options

Stock Option and Restricted Stock Unit Activity

Stock Option and Restricted Stock Unit Activity

Stock Option and Restricted Stock Unit Activity

Restricted Stock Units

Restricted Stock Units

Restricted Stock Units

Stock Appreciation Units (SARs)

Stock Appreciation Units (SARs)

Stock Appreciation Units (SARs)

Stock Appreciation Rights (SARs)

Stock Appreciation Rights (SARs)

Stock Appreciation Rights (SARs)

Stock Appreciation Rights (SARs)

Employee stock purchase plan

2004 Stock Option Plan

2010 Equity Incentive Plan

2010 Equity Incentive Plan

2010 Equity Incentive Plan

2010 Equity Incentive Plan

2010 Equity Incentive Plan

2010 ESPP

2010 ESPP

2011 Inducement Award Plan

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Nonqualified Stock Options

Minimum

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares available for future grant

796,678

382,668

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

507,435

'

'

'

'

369,878

'

317,472

Options to purchase shares, outstanding

4,103,454

2,773,887

'

'

'

'

'

'

'

'

'

'

'

'

'

'

420,397

212,534

'

'

'

1,517,048

'

'

'

'

'

'

'

'

Shares outstanding

'

'

'

160,397

'

'

'

'

'

'

1,169,649

924,823

'

'

'

'

'

'

'

'

'

'

3,358,169

'

'

'

'

'

'

397,886

Exercise price, percentage of fair value of common stock on grant date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

85.00%

'

'

100.00%

Options vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

Awards expiration period from date of grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'10 years

Maximum aggregate number of shares of common stock that may be issued

6,444,141

'

'

'

6,069,781

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

369,878

'

8,000,000

865,420

'

'

'

600,000

342,568

750,000

Number of shares of common stock outstanding increase percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

'

'

'

'

3.50%

'

'

Offering period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'12 months

'

'

Issuance of common stock under employee stock purchase plan (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

487,856

'

'

Fair value of options vested

'

'

'

'

$1,100,000

$2,100,000

$1,000,000

'

'

'

'

'

'

$100,000

$300,000

$100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intrinsic value of options exercised

'

'

'

'

700,000

100,000

400,000

'

'

'

'

'

'

100,000

20,000

20,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-average fair value of options granted

'

'

'

'

$4.65

$3.33

$4.15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized stock-based compensation expenses

'

'

'

'

7,900,000

'

'

'

'

'

5,500,000

'

'

900,000

'

'

'

'

'

'

700,000

'

'

'

'

'

'

'

'

'

Remaining weighted-average period

'

'

'

'

'4 years 4 months 24 days

'

'

'

'

'

'2 years

'

'

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted

'

'

'

'

'

'

'

1,200,000

'

'

688,740

'

'

'

'

'

275,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Option vesting terms

'

'

'

'

'

'

'

'These options will vest if the average closing price of the Company’s common stock over a period of 20 consecutive trading days is equal to or greater than $15.00 per share and the recipients remain in continuous service with the Company through such period, or fully accelerate and vest in December 2019.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of days for stock price to be traded above mentioned price

'

'

'

'

'

'

'

'20 days

'

'

'

'

'

'

'

'

'20 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum closing stock price

'

'

'

'

'

'

'

$15

'

'

'

'

'

'

'

'

$15

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted-average fair value granted

'

'

'

'

'

'

'

'

$4.11

$5.97

$6.96

$5.27

'

'

'

'

'

'

$4.64

$5.17

'

'

'

'

'

'

'

'

'

'

Allocated share based compensation expense

5,736,000

4,777,000

3,108,000

'

'

'

'

400,000

'

'

'

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of options vested

'

'

'

'

'

'

'

'

'

'

2,100,000

1,100,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intrinsic value of units exercised

'

'

'

'

'

'

'

'

'

'

2,900,000

800,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted

'

'

'

'

'

'

'

'

$4.11

$5.97

$6.96

$5.27

'

'

'

'

'

'

$4.64

$5.17

'

'

'

'

'

'

'

'

'

'

Common stock withheld shares

'

'

'

'

'

'

'

'

'

'

68,390

28,229

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remitted cash to appropriate tax authorities

565,000

'

'

'

'

'

'

'

'

'

600,000

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liability for settlement

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000

400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized stock based compensation expense

'

'

'

'

$7,900,000

'

'

'

'

'

$5,500,000

'

'

$900,000

'

'

'

'

'

'

$700,000

'

'

'

'

'

'

'

'

'

Performance-based stock appreciation units

'

'

'

'

'

'

'

1,200,000

'

'

688,740

'

'

'

'

'

275,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated_Fair_Value_of_Certai

Estimated Fair Value of Certain Stock-Based Awards Using Black-Scholes-Merton Valuation Model (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee stock options	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Weighted-average expected term (years)	'6 years 5 months 27 days	'6 years 9 months 7 days	'6 years 8 months 9 days
Weighted-average volatility	74.00%	72.00%	71.00%
Risk-free interest rate Minimum	1.08%	0.99%	1.62%
Risk-free interest rate Maximum	1.86%	2.70%	2.92%
Expected dividends	0.00%	0.00%	0.00%
Stock Appreciation Units (SARs)	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Weighted-average expected term (years)	'1 year 10 months 24 days	'2 years 10 months 17 days	'3 years 10 months 28 days
Weighted-average volatility	58.00%	68.00%	74.00%
Risk-free interest rate Minimum	0.10%	0.21%	0.36%
Risk-free interest rate Maximum	0.63%	0.63%	2.42%
Expected dividends	0.00%	0.00%	0.00%
Employee stock purchase plan	'	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'
Weighted-average expected term (years)	'8 months 23 days	'9 months	'8 months 16 days
Weighted-average volatility	48.00%	60.00%	68.00%
Risk-free interest rate Minimum	0.09%	0.04%	0.04%
Risk-free interest rate Maximum	0.16%	0.16%	0.23%
Expected dividends	0.00%	0.00%	0.00%

Summary_of_StockBased_Compensa

Summary of Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'
Allocated share based compensation expense	$5,736	$4,777	$3,108
Cost of Goods Sold	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'
Allocated share based compensation expense	924	800	503
Research and Development Expense	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'
Allocated share based compensation expense	2,060	1,744	1,033
Selling and Marketing Expense	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'
Allocated share based compensation expense	1,167	934	647
General and Administrative Expense	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'
Allocated share based compensation expense	$1,585	$1,299	$925

Summary_of_Stock_Option_and_Re

Summary of Stock Option and Restricted Stock Unit Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Shares Available for Grant	'	'
Beginning Balance	382,668	'
Authorized for issuance	2,569,115	'
Granted	-2,420,870	'
Forfeited	265,765	'
Ending Balance	796,678	'
Number of Shares	'	'
Beginning Balance	2,773,887	'
Granted	1,732,130	'
Exercised/Converted	-260,604	'
Forfeited	-141,959	'
Ending Balance	4,103,454	'
Weighted Average Exercise Price	'	'
Beginning Balance	$5.87	'
Granted	$5.92	'
Exercised/Converted	$4.65	'
Forfeited	$7.35	'
Ending Balance	$5.92	'
Restricted Stock Units	'	'
Number of Units	'	'
Beginning Balance	924,823	'
Granted	688,740	'
Exercised/Converted	-345,359	'
Forfeited	-98,555	'
Ending Balance	1,169,649	924,823
Weighted Average Grant Date Fair Value	'	'
Beginning Balance	$5.84	'
Granted	$6.96	$5.27
Exercised/Converted	$8.26	'
Forfeited	$6.13	'
Ending Balance	$6.42	$5.84

Summary_of_Information_about_S

Summary of Information about Stock Options Outstanding (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013
Number of Shares	'
Vested and expected to vest	3,729,782
Exercisable	1,935,519
Weighted Average Exercise Price	'
Vested and expected to vest	$5.94
Exercisable	$5.88
Weighted Average Remaining Contractual Term (Years)	'
Vested and expected to vest	'6 years 8 months 5 days
Exercisable	'4 years 11 months 5 days
Aggregate Intrinsic Value (in Thousands)	'
Vested and expected to vest	$5,824
Exercisable	$3,618

Summary_of_Information_about_R

Summary of Information about Restricted Stock Units Outstanding (Detail) (Restricted Stock Units, USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013
Restricted Stock Units	'
Number of Shares	'
Vested and expected to vest	1,102,383
Weighted Average Grant Date Fair Value	'
Vested and expected to vest	$6.42
Weighted Average Remaining Contractual Term (Years)	'
Vested and expected to vest	'1 year 3 months
Aggregate Intrinsic Value	'
Vested and expected to vest	$7,783

Summary_of_Companys_Stock_Appr

Summary of Company's Stock Appreciation Unit Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Number of Units	'
Beginning Balance	2,773,887
Granted	1,732,130
Exercised/Converted	-260,604
Forfeited	-141,959
Ending Balance	4,103,454
Weighted-Average Exercise Price	'
Beginning Balance	$5.87
Granted	$5.92
Exercised/Converted	$4.65
Forfeited	$7.35
Ending Balance	$5.92
Stock Appreciation Rights (SARs)	'
Number of Units	'
Beginning Balance	212,534
Granted	275,000
Exercised/Converted	-29,263
Forfeited	-37,874
Ending Balance	420,397
Weighted-Average Exercise Price	'
Beginning Balance	$7.07
Granted	$5.40
Exercised/Converted	$4.36
Forfeited	$7.45
Ending Balance	$6.13

Income_Loss_before_Income_Taxe

Income (Loss) before Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Income Loss Before Income Taxes [Line Items]	'	'	'
U.S. operations	($39,618)	($25,599)	($20,712)
Non-U.S. operations	6,483	9,291	6,477
Loss before income taxes	($33,135)	($16,308)	($14,235)

Components_of_Provision_for_In

Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current	'	'	'
Federal	$7	($103)	($257)
State	-11	'	'
Foreign	-1,658	-1,119	-1,350
Provision for income tax, current	-1,662	-1,222	-1,607
Deferred	'	'	'
Federal	'	'	'
State	'	'	'
Foreign	458	-142	452
Total provision for income taxes from continuing operations	-1,204	-1,364	-1,155
Benefit from (provision for) income taxes	'	-114	318
Total provision	($1,204)	($1,478)	($837)

Difference_in_Provision_for_In

Difference in Provision for Income Taxes from Amount Obtained by Applying U.S. Federal Statutory Rate (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes Reconciliation [Line Items]	'	'	'
Federal statutory rate	35.00%	34.00%	34.00%
Tax at federal statutory rate	$11,597	$5,599	$4,840
State taxes, net of federal benefit	1,058	967	397
Nondeductible expenses	-260	96	138
Stock-based compensation	-385	-529	-511
Change in valuation allowance	-13,042	-7,308	-811
Research and development	1,077	'	485
Foreign rate differences	-2,129	-656	3,555
Earn out adjustment not taxable	-359	132	438
Foreign income inclusion	'	'	-5,140
Change in prior year deferred balances	1,756	826	'
Acquisition-related costs	-391	-491	-4,585
Other	-126	'	39
Total provision for income taxes from continuing operations	($1,204)	($1,364)	($1,155)

Components_of_Deferred_Income_

Components of Deferred Income Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets	'	'
Net operating loss carryforwards	$79,944	$69,969
Federal and state credits	9,357	7,747
Reserves, accruals and other	6,091	5,498
Fixed assets and intangibles	3,874	902
Total deferred tax assets	99,266	84,116
Valuation allowance	-91,045	-78,003
Total deferred tax assets, net of valuation allowance	8,221	6,113
Deferred tax liabilities	'	'
Acquired intangibles	-6,910	-5,362
Net deferred tax assets	1,311	751
Reported as:	'	'
Current deferred tax assets, included within prepaid expenses and other current assets	2,315	1,333
Long-term deferred tax assets, included within other long-term assets	'	71
Deferred income tax liabilities	-1,004	-653	[1]
Net deferred tax assets	$1,311	$751
[1]	Revised

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]	'	'	'	'
Increase in net valuation allowance	$13,000,000	$6,500,000	$15,100,000	'
Undistributed earnings of foreign subsidiaries	26,200,000	'	'	'
Federal statutory rate	35.00%	34.00%	34.00%	'
Gross unrecognized tax benefits	16,452,000	11,993,000	9,214,000	5,101,000
Unrecognized tax benefits affecting effective tax rate if recognized	200,000	'	'	'
Open tax year	'2008	'	'	'
Federal	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Net operating loss carryforwards	238,000,000	'	'	'
Research credit	5,100,000	'	'	'
Net operating loss carryforwards, expiration date	31-Dec-18	'	'	'
Federal tax credit expiration date	31-Dec-18	'	'	'
State	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Net operating loss carryforwards	155,600,000	'	'	'
Research credit	11,200,000	'	'	'
Net operating loss carryforwards, expiration date	31-Dec-14	'	'	'
Foreign Country	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Benefits realized from reduced tax rate	$200,000	$900,000	$500,000	'
Benefits realized from reduced tax rate, per share	$0.01	$0.03	$0.02	'
Subsidiaries | Foreign Country	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Federal statutory rate	25.00%	'	'	'
Effective income tax rate	15.00%	'	'	'

Reconciliation_of_Beginning_an

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]	'	'	'
Beginning Balance	$11,993	$9,214	$5,101
Gross increases for tax positions of prior years	155	70	119
Releases for tax positions of prior years	'	-26	'
Gross increases for tax positions of current year	4,361	2,735	3,994
Reductions resulting from lapse of applicable statute of limitations	-57	'	'
Ending Balance	$16,452	$11,993	$9,214

Segment_and_Geographic_Informa2

Segment and Geographic Information (Detail)	12 Months Ended
	Dec. 31, 2013
	Segment
Segment Reporting Information [Line Items]	'
Number of reportable segments	1

Revenue_and_LongLived_Assets_B

Revenue and Long-Lived Assets By Geographical Region (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Revenue

$74,375

$76,814

$74,990

$56,063

$62,023

$66,152

$63,025

$54,223

$282,242

$245,423

$201,029

Property, plant and equipment, net

68,851

'

'

'

54,440

[1]

'

'

'

68,851

54,440

[1]

'

China

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

122,387

121,236

129,390

Property, plant and equipment, net

32,993

'

'

'

31,922

'

'

'

32,993

31,922

'

United States

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

45,036

66,007

31,180

Property, plant and equipment, net

20,150

'

'

'

21,706

'

'

'

20,150

21,706

'

Japan

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

25,451

14,771

15,085

Property, plant and equipment, net

15,690

'

'

'

812

'

'

'

15,690

812

'

Rest of World

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

89,368

43,409

25,374

Property, plant and equipment, net

$18

'

'

'

'

'

'

'

$18

'

'

[1]

Revised

Summary_of_Quarterly_Financial

Summary of Quarterly Financial Information (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	$74,375	$76,814	$74,990	$56,063	$62,023	$66,152	$63,025	$54,223	$282,242	$245,423	$201,029
Gross profit	19,636	18,179	15,601	11,757	14,050	20,616	15,188	11,406	65,173	61,260	50,085
Net loss	-4,452	-9,363	-8,284	-12,240	-2,989	723	-3,656	-11,608	-34,339	-17,530	-14,754
Net income (loss)	($0.14)	($0.30)	($0.27)	($0.40)	($0.10)	$0.02	($0.13)	($0.46)	($1.11)	($0.62)	($1.42)
Weighted averages shares used to compute basic and diluted net loss per share	31,450,916	31,184,958	30,779,730	30,574,032	'	'	'	'	31,000,325	28,529,849	22,359,802
Income ( loss) from continuing operations	'	'	'	'	-2,961	723	-3,656	-11,778	-34,339	-17,672	-15,390
Income from discontinued operations	'	'	'	'	($28)	'	'	$170	'	$142	$636
Continuing operations	'	'	'	'	($0.10)	$0.02	($0.13)	($0.47)	($1.11)	($0.62)	($1.45)
Discontinued operations	'	'	'	'	'	'	'	$0.01	'	'	$0.03
Weighted averages shares used to compute basic net income (loss) per share	'	'	'	'	30,414,735	30,215,144	28,402,929	24,870,684	'	'	'
Weighted averages shares used to compute diluted net income (loss) per share	'	'	'	'	30,414,735	30,611,304	28,402,929	24,870,684	'	'	'