Neophotonics (NPTN) 10-Q 24 Jun 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Jun. 16, 2014
Document Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'NPTN	'
Entity Registrant Name	'NEOPHOTONICS CORP	'
Entity Central Index Key	'0001227025	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	31,780,761

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$53,056	$57,101
Short-term investments	8,285	17,916
Restricted cash	2,953	2,138
Accounts receivable, net of allowance for doubtful accounts	70,647	64,533
Inventories	67,949	64,908
Prepaid expenses and other current assets	12,503	9,977
Total current assets	215,393	216,573
Property, plant and equipment, net	66,115	68,851
Other intangible assets, net	13,972	15,005
Other long-term assets	1,820	1,798
Total assets	297,300	302,227
Current liabilities:	'	'
Accounts payable	56,845	48,569
Notes payable	11,210	9,738
Current portion of long-term debt	10,395	10,325
Accrued and other current liabilities	26,246	23,643
Total current liabilities	104,696	92,275
Long-term debt, net of current portion	19,145	24,150
Deferred income tax liabilities	1,205	1,004
Other noncurrent liabilities	7,444	7,987
Total liabilities	132,490	125,416
Commitments and contingencies (Note 10)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.0025 par value At March 31, 2014 and December 31, 2013: 10,000 shares authorized, no shares issued or outstanding	'	'
Common stock $0.0025 par value At March 31,2014: 100,000 shares issued and outstanding; At December 31, 2013: 100,000 shares authorized, 31,572 shares issued and outstanding	80	79
Additional paid-in capital	449,531	447,467
Accumulated other comprehensive income	10,209	11,687
Accumulated deficit	-295,010	-282,422
Total stockholders’ equity	164,810	176,811
Total liabilities and stockholders’ equity	$297,300	$302,227

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	31,664	31,572
Common stock, shares outstanding	31,664	31,572

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$68,168	$56,063
Cost of goods sold	54,368	44,306
Gross profit	13,800	11,757
Operating expenses:	'	'
Research and development	12,056	9,707
Sales and marketing	3,411	3,586
General and administrative	8,987	5,059
Acquisition-related transaction costs	'	4,510
Amortization of purchased intangible assets	379	321
Restructuring charges	'	325
Total operating expenses	24,833	23,508
Loss from operations	-11,033	-11,751
Interest income	65	131
Interest expense	-251	-163
Other expense, net	-607	-274
Total interest and other expense, net	-793	-306
Loss before income taxes	-11,826	-12,057
Income tax expense	-762	-183
Net loss	($12,588)	($12,240)
Basic and diluted net loss per share	($0.40)	($0.40)
Weighted average shares used to compute basic and diluted net loss per share	31,610	30,574

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net loss	($12,588)	($12,240)
Foreign currency translation adjustments, net of tax of zero	-1,599	172
Defined benefit pension plans adjustment, net of tax of $73	118	'
Unrealized gain (loss) on investments, net of tax of zero	3	-19
Comprehensive loss	($14,066)	($12,087)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Foreign currency translation adjustments, tax	$0	$0
Defined benefit pension plans adjustment, tax	73	'
Unrealized gains (losses) on investments, tax	$0	$0

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities	'	'
Net loss	($12,588)	($12,240)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:	'	'
Depreciation and amortization	5,528	4,152
Stock-based compensation expense	1,901	1,202
Deferred taxes	76	'
Investment-related amortization and accrued interest	56	315
Loss on disposal of property and equipment	15	111
Adjustment to fair value of penalty payment derivative	186	'
Allowance for doubtful accounts	-84	22
Write-down of inventories	567	30
Other, net	-333	34
Change in assets and liabilities, net of effects of acquisitions:	'	'
Accounts receivable	-6,643	7,155
Inventories	-4,413	-4,682
Prepaid expenses and other assets	-2,512	-1,292
Accounts payable	9,168	2,126
Accrued and other liabilities	1,719	4,228
Net cash provided by (used in) operating activities	-7,357	1,161
Cash flows from investing activities	'	'
Purchase of property, plant and equipment	-2,070	-5,134
Purchase of marketable securities	-5,072	-29,030
Proceeds from sale of marketable securities	9,644	23,747
Proceeds from maturity of securities	5,007	20,900
Decrease (increase) in restricted cash	-879	524
Acquisition, net of notes payable	'	-14,087
Net cash provided by (used in) investing activities	6,630	-3,080
Cash flows from financing activities	'	'
Proceeds from exercise of stock options	303	151
Tax withholding on restricted stock units	-80	-72
Proceeds from bank loans	'	26,443
Repayment of bank loans	-5,157	-8,610
Proceeds from issuance of notes payable	6,178	4,881
Repayment of notes payable	-4,448	-6,482
Net cash provided by (used in) financing activities	-3,204	16,311
Effect of exchange rates on cash and cash equivalents	-114	72
Net increase (decrease) in cash and cash equivalents	-4,045	14,464
Cash and cash equivalents at the beginning of the period	57,101	36,940
Cash and cash equivalents at the end of the period	53,056	51,404
Supplemental disclosure of noncash investing and financing activities:	'	'
Issuance of notes to the seller of acquired business	'	$11,130

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Basis of Presentation and Significant Accounting Policies	'
	Note 1. Basis of presentation and significant accounting policies
	Basis of Presentation and Consolidation
	The condensed consolidated financial statements of NeoPhotonics Corporation (“NeoPhotonics” or the “Company”) as of March 31, 2014 and December 31, 2013 and for the three months ended March 31, 2014 and 2013, have been prepared in accordance with the instructions on Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In accordance with those rules and regulations, the Company has omitted certain information and notes normally provided in the Company’s annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, consisting only of normal recurring items, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the interim periods. The year-end condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”). These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. The results of operations for the three months ended March 31, 2014 are not necessarily indicative of the results expected for the entire fiscal year. All significant intercompany accounts and transactions have been eliminated.
	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.
	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, warranty reserves and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
	Summary of Significant Accounting Policies
	There have been no changes in the Company’s significant accounting policies for the three months ended March 31, 2014, as compared to the significant accounting policies described in its Annual Report on Form 10-K for the year ended December 31, 2013.
	Recent accounting pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("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.
	In April 2014, the FASB issued 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 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 exists. This guidance is 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.

Net_Loss_per_Share

Net Loss per Share	3 Months Ended
	Mar. 31, 2014
Net Loss per Share	'
	Note 2. Net loss per share
	The following table sets forth the computation of the basic and diluted net loss per share for the periods indicated (in thousands, except per share amounts):
		Three months ended
		March 31,
		2014			2013
	Numerator:
	Net loss	$	(12,588	)	$	(12,240	)
	Denominator:
	Weighted average shares used to compute basic and diluted net loss per share		31,610			30,574
	Basic and diluted net loss per share	$	(0.40	)	$	(0.40	)
	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 March 31, 2014 and 2013 were as follows (in thousands):
		March 31,
		2014			2013
	Employee stock options		3,952			2,759
	Restricted stock units		1,134			849
	Employee stock purchase plan		469			484
	Common stock warrants		4			4
			5,559			4,096

Cash_Equivalents_and_Investmen

Cash Equivalents and Investments	3 Months Ended
	Mar. 31, 2014
Cash Equivalents and Investments	'
	Note 3. Cash equivalents and investments
	The following table summarizes the Company’s unrealized gains and losses related to the cash equivalents and investments in marketable securities designated as available-for-sale (in thousands):
		As of March 31, 2014								As of December 31, 2013
		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	$	16	$	—	$	—	$	16	$	11	$	—	$	—		$	11
	Time deposits		—		—		—		—		6,540		—		—			6,540
	Short-term investments
	Money market funds		—		—		—		—		4,577		—		—			4,577
	Corporate bonds		4,571		—		—		4,571		6,708		3		(5	)		6,706
	Foreign bonds and notes		2,008		6		—		2,014		4,827		5		—			4,832
	Variable rate demand notes		1,700		—		—		1,700		1,801		—		—			1,801
	Total short-term investments		8,279		6		—		8,285		17,913		8		(5	)		17,916
	Total investments	$	8,295	$	6	$	—	$	8,301	$	24,464	$	8	$	(5	)	$	24,467
	As of March 31, 2014 and December 31, 2013, maturities of marketable securities were as follows (in thousands):
		March 31,		December 31,
		2014		2013
	Less than 1 year	$	4,587	$	20,658
	Due in 1 to 2 years		2,014		2,008
	Due in 2 to 5 years		—		—
	Due after 5 years		1,700		1,801
	Total	$	8,301	$	24,467
	The Company may sell its investments in the future to fund future operating needs. As a result, the Company recorded all its marketable securities in short-term investment as of March 31, 2014 and December 31, 2013, regardless of the contractual maturity date of the securities.
	Realized gains and losses on the sale of marketable securities during the three months ended March 31, 2014 and 2013 were immaterial. The Company did not recognize any impairment losses on its marketable securities during the three months ended March 31, 2014 or 2013. As of March 31, 2014, the Company did not have any investments in marketable securities that were in an unrealized loss position for a period in excess of 12 months.

Fair_Value_Disclosures

Fair Value Disclosures	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures	'
	Note 4. Fair value disclosures
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following table presents the Company's assets that are measured at fair value on a recurring basis (in thousands):
		As of March 31, 2014								As of December 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash, cash equivalents and short-term investments
	Money market funds	$	16	$	—	$	—	$	16	$	4,588	$	—	$	—	$	4,588
	Time deposits		—		—		—		—		—		6,540		—		6,540
	Corporate bonds		—		4,571		—		4,571		—		6,706		—		6,706
	U.S. federal agencies		—		—		—		—		—		—		—		—
	Foreign bonds and notes		—		2,014		—		2,014		—		4,832		—		4,832
	Variable rate demand notes		—		1,700		—		1,700		—		1,801		—		1,801
		$	16	$	8,285	$	—	$	8,301	$	4,588	$	19,879	$	—	$	24,467
	Mutual funds held in Rabbi Trust	$	484	$	—	$	—	$	484	$	442	$	—	$	—	$	442
	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 March 31, 2014.  The assets held by the Rabbi Trust are substantially in the form of exchange traded mutual funds and are included in the Company’s other long-term assets on its condensed consolidated balance sheets at March 31, 2014 and December 31, 2013.
	The following table presents the Company's liabilities that are measured at fair value on a recurring basis (in thousands):
		As of March 31, 2014								As of December 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Contingent consideration (Note 10)	$	—	$	—	$	1,985	$	1,985	$	—	$	—	$	1,985	$	1,985
	Penalty payment derivative (Note 10)	$	—	$	—	$	425	$	425	$	—	$	—	$	239	$	239
	Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
	There were no assets or liabilities measured at fair value on a nonrecurring basis at March 31, 2014 or December 31, 2013.
	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 and acquisition-related debt was not materially different than its carrying value at March 31, 2014 and December 31, 2013 as the interest rates approximated rates currently available to the Company.

Business_Combination

Business Combination	3 Months Ended
	Mar. 31, 2014
Business Combination	'
	Note 5. Business combination
	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.
	Total consideration for NeoPhotonics Semiconductor was $24.3 million, including cash of $14.1 million paid upon closing and notes payable of $11.1 million (see Note 8), partially offset by a net receivable from Lapis of $1.0 million that was received subsequent to March 31, 2013. The cash paid includes $2.0 million that was withheld and placed into escrow to cover certain indemnity obligations.
	In connection with the acquisition, the Company incurred approximately $4.5 million in acquisition-related transaction costs during the three months ended March 31, 2013 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 were included in operating expenses in the Company’s condensed consolidated statement of operations.
	NeoPhotonics Semiconductor’s results of operations between the closing date of March 29, 2013 and the Company’s quarter end date of March 31, 2013 were immaterial.
	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	$	14,087
	Net receivable from LAPIS		(959	)
	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 unaudited supplemental pro forma information presents the combined results of operations of NeoPhotonics Corporation and NeoPhotonics Semiconductor for the three months ended March 31, 2013 as though the companies had been combined as of the beginning of the period presented. The pro forma financial information includes elimination of $4.5 million of transaction costs and $1.9 million of revenue and $1.8 million of costs related to sales from NeoPhotonics Semiconductor to the Company.
	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):
		Three Months Ended March 31, 2013
	Revenue	$	68,754
	Net loss	$	(5,277	)
	Basic and diluted net loss per share	$	(0.17	)

Balance_Sheet_Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2014
Balance Sheet Components	'
	Note 6. Balance sheet components
	Accounts receivable, net
	Accounts receivable, net consists of the following (in thousands):
		March 31, 2014			December 31, 2013
	Accounts receivable	$	64,586		$	57,010
	Trade notes receivable		6,480			8,054
	Allowance for doubtful accounts		(419	)		(531	)
		$	70,647		$	64,533
	Inventories
	Inventories consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Raw materials	$	27,876		$	26,379
	Work in process		22,844			14,341
	Finished goods (1)		17,229			24,188
		$	67,949		$	64,908
	(1)Finished goods inventory at customer vendor managed inventory locations was $4.9 million and $5.4 million as of March 31, 2014 and December 31, 2013, respectively.
	Purchased intangible assets
	Purchased intangible assets consist of the following (in thousands):
		31-Mar-14								December 31, 2013
		Gross			Accumulated			Net		Gross		Accumulated			Net
		Assets			Amortization			Assets		Assets		Amortization			Assets
	Technology and patents	$	34,250		$	(26,337	)	$	7,913	$	34,524	$	(25,931	)	$	8,593
	Customer relationships		14,920			(9,967	)		4,953		15,004		(9,732	)		5,272
	Leasehold interest		1,373			(267	)		1,106		1,406		(266	)		1,140
	Noncompete agreements		950			(950	)		—		950		(950	)		—
		$	51,493		$	(37,521	)	$	13,972	$	51,884	$	(36,879	)	$	15,005
	Amortization expense relating to technology and patents and the leasehold interest intangible assets is included within cost of goods sold, and customer relationships within operating expenses. The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Cost of goods sold	$	714		$	428
	Operating expenses		379			321
	Total	$	1,093		$	749
	The estimated future amortization expense of purchased intangible assets as of March 31, 2014, is as follows (in thousands):
	2014 (remaining 9 months)	$	3,275
	2015		4,426
	2016		3,682
	2017		807
	2018		591
	Thereafter		1,191
		$	13,972
	Accrued and other current liabilities
	Accrued and other current liabilities consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Employee-related accrued expenses	$	14,449		$	12,297
	Other accrued expenses		11,372			11,346
	Penalty payment derivative		425			—
		$	26,246		$	23,643
	Warranty Accrual
	The table below summarizes the movement in the warranty accrual, which is included in accrued and other current liabilities (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Beginning balance	$	1,737		$	1,072
	Warranty accruals		289			26
	Settlements and adjustments		(357	)		86
	Ending balance	$	1,669		$	1,184
	Other noncurrent liabilities
	Other noncurrent liabilities consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Pension and other employee-related	$	6,098		$	6,206
	Penalty payment derivative		—			239
	Other		1,346			1,542
	$	7,444		$	7,987

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2014
Restructuring	'
	Note 7. Restructuring
	The following table summarizes activity associated with restructuring obligations during the three months ended March 31, 2014 (in thousands):
		Facilities			Contract			Total
					Termination
	Restructuring obligations, December 31, 2013	$	211		$	66		$	277
	Restructuring costs incurred		—			—			—
	Cash payments		(27	)		(66	)		(93	)
	Non-cash settlements and other		—			—			—
	Restructuring obligations, March 31, 2014	$	184		$	—		$	184

Debt

Debt	3 Months Ended
	Mar. 31, 2014
Debt	'
	Note 8. 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):
		31-Mar-14						31-Dec-13
		Carrying			Weighted			Carrying		Weighted
		Amount			Average			Amount		Average
					Interest					Interest
					Rate					Rate
	Notes payable	$	11,210				$	9,738		—
	Long-term debt:
	Acquisition-related	$	6,790		1.5	%	$	9,975		1.5	%
	Bank borrowings		22,750		3.15	%		24,500		2.92	%
			29,540					34,475
	Less: current portion of long-term debt		(10,395	)				(10,325	)
	Total long-term debt, net of current portion	$	19,145				$	24,150
	Notes payable
	The Company regularly 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 March 31, 2014 and December 31, 2013, restricted cash totaled $3.0 million and $2.1 million, respectively. In May 2014, one of the Company’s subsidiaries in China issued a 90-day bank acceptance draft of $8.0 million to another of the Company’s subsidiaries that required a compensating balance of $2.4 million.  This bank acceptance draft can be sold for cash at a discount prior to its expiration.
	At March 31, 2014, the Company’s subsidiaries in China had two short-term line of credit facilities with banking institutions, both of which subsequently expired. In June 2014, one of the credit facilities was renewed.  Under the renewed agreement, which expires in June 2015, the Company’s subsidiaries in China have a short-term line of credit of RMB 160.0 million ($25.7 million) of which the full amount can be used for bank acceptance drafts (with a 25% compensating balance requirement) and up to RMB 120.0 million ($19.3 million) can be used for short-term loans, which will bear interest at varying rates depending upon the term.  The second credit facility is in the process of being renewed.
	Acquisition-related
	In connection with the acquisition of NeoPhotonics Semiconductor on March 29, 2013, the Company was 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, of which 700 million Japanese Yen ($6.8 million) was outstanding at March 31, 2014. The obligation bears interest at 1.5% per year, payable annually, and is secured by the acquired real estate property.
	Bank borrowings
	The Company has a credit agreement with Comerica Bank as lead bank in the U.S., which has been amended several times. The components of the available credit facilities are as follows:
	—	A revolving credit facility under which there was nothing outstanding at March 31, 2014 or December 31, 2013 and $20.0 million was available for borrowing at March 31, 2014, subject to covenant requirements. 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 1.75% or LIBOR plus 2.75%. As of March 31, 2014 the rate on the LIBOR option was 2.90%.
	—	A term loan facility of $28.0 million, under which $22.8 million and $24.5 million was outstanding at March 31, 2014 and December 31, 2013, respectively. 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 2.0% or LIBOR plus 3.0%. As of March 31, 2014 the rate on the LIBOR option was 3.15%.
	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 certain 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 March 31, 2014, which noncompliance was effectively waived in the amendment described below.
	On May 19, 2014, the Company executed an amendment to the credit agreement that waived the testing of certain covenants for compliance, including the March 31, 2014 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, which will be classified as restricted cash on the Company’s June 30, 2014 condensed consolidated balance sheet.
	At March 31, 2014, maturities of long-term debt were as follows (in thousands):
	2014 (remaining nine months)	$	5,250
	2015		10,395
	2016		10,395
	2017		3,500
		$	29,540
	On May 23, 2014, one of the Company’s subsidiaries in China borrowed CNY 50 million ($8.0 million) under a working capital loan agreement with a bank.  The loan bears interest at 7% per annum.  Interest is payable monthly and the principal is due on November 23, 2014.

Japan_Pension_Plans

Japan Pension Plans	3 Months Ended
	Mar. 31, 2014
Japan Pension Plans	'
	Note 9. Japan 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.  Effective February 28, 2014, the DBCPP was converted to a defined contribution plan (“DCP”). In May 2014, LAPIS transferred approximately $2.0 million into the newly formed DCP which is the allowable amount that can be transferred according to the Japanese regulations.   LAPIS also 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 March 31, 2014. Additionally, the Company transferred the net unfunded projected benefit obligation amount from the DBCPP to the RAP and froze the RAP benefit at the February 28, 2014 amount.
	As a result of these changes to the DBCPP and the RAP, the Company recorded a curtailment gain of $0.1 million in the quarter ended March 31, 2014. The pension liability at March 31, 2014 was $5.7 million.
	The Company contributed $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.
	Net periodic pension cost associated with these plans for the period from December 31, 2013 to February 28, 2014 included the following components (in thousands):
	Service cost	$	53
	Interest cost		13
	Amortization		1
	Net periodic pension costs	$	67

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies	'
	Note 10. Commitments and contingencies
	Litigation
	From time to time, the Company is subject to various claims and legal proceedings, either asserted or unasserted, that arise in the ordinary course of business. The Company accrues for legal contingencies if the Company can estimate the potential liability and if the Company believes it is more likely than not that the case will be ruled against it. If a legal claim for which the Company did not accrue is resolved against it, the Company would record the expense in the period in which the ruling was made. The Company does not believe that the ultimate amount of liability, if any, for any pending claims of any type (alone or combined) will materially affect the Company’s 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 the Company’s financial condition and operating results. Regardless of outcome, litigation can have an adverse impact on the Company because of defense costs, negative publicity, diversion of management resources and other factors.
	On January 5, 2010, Finisar Corporation, or Finisar, filed a complaint in the U.S. District Court for the Northern District of California 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 March 31, 2014, the Company does not have any material indemnification claims that were probable or reasonably possible.
	Leases
	The Company leases various facilities under non-cancelable operating leases expiring through 2023.  Future minimum payments under these operating leases totaled $6.3 million as of March 31, 2014. Rent expense was $0.5 million and $0.6 million for the three months ended March 31, 2014 and 2013, respectively.
	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 Corporation (“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”).   The Company had recorded the entire $2.0 million as its estimated fair value of the Contingent Consideration Amount as of December 31, 2013. 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 quarter in which it was received).
	Penalty Payment Derivative
	In connection with a private placement transaction in 2012, the Company agreed to certain performance obligations including establishing a wholly-owned subsidiary in the Russian Federation 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. 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 $0.4 million and $0.2 million at March 31, 2014 and December 31, 2013, respectively.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity	'
	Note 11. Stockholders’ equity
	Common Stock
	As of March 31, 2014, the Company had reserved 7,076,987common stock shares for issuance under its stock option plans, 969,878 common stock shares for issuance under its stock purchase plan and 4,482 common stock shares to be issued upon exercise of the outstanding warrants.
	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 the Company’s 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	3 Months Ended
	Mar. 31, 2014
Stock-Based Compensation	'
	Note 12. Stock-based compensation
	The following table summarizes the stock-based compensation expense recognized for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Cost of goods sold	$	330		$	243
	Research and development		707			418
	Sales and marketing		373			238
	General and administrative		491			303
		$	1,901		$	1,202
	Determining Fair Value
	The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions:
			Three Months Ended March 31,
	Stock options		2014	2013
	Weighted-average expected term (years)		5.12	6.55
	Weighted-average volatility		72%	76%
	Risk-free interest rate		1.75%	1.08%
	Expected dividends		—  %	—  %
	Stock appreciation units
	Weighted-average expected term (years)		2.15	2.61
	Weighted-average volatility		59%	63%
	Risk-free interest rate		0.13% – 0.78%	0.20% – 0.46%
	Expected dividends		—  %	—  %
	ESPP
	Weighted-average expected term (years)		0.76	0.74
	Weighted-average volatility		54%	48%
	Risk-free interest rate		0.10 – 0.13%	0.13 – 0.16%
	Expected dividends		—  %	—  %
	Stock Options
	The Company granted 20,600 and 17,800 stock options during the three months ended March 31, 2014 and 2013, with weighted-average grant-date fair values per share of $4.68 and $3.80, respectively. Options for 113,184 and 14,472 shares were forfeited during the three months ended March 31, 2014 and 2013, respectively.  As of March 31, 2014, there were 3,952,356 unexercised stock options outstanding.
	Restricted Stock Units (“RSUs”)
	The Company granted 22,500 and 12,200 RSUs during the three months ended March 31, 2014 and 2013, with weighted-average grant-date fair values per share of $7.98 and $5.74, respectively. As of March 31, 2014, there were 1,134,317 RSUs outstanding.
	Stock appreciation units (“SAUs”)
	The Company did not grant any SAUs during the three months ended March 31, 2014 or 2013. As of March 31, 2014, there were 414,655 SAUs outstanding. SAUs are liability classified share-based awards which are re-measured each reporting period at fair value.
	Employee Stock Purchase Plan (“ESPP”)
	At March 31, 2014 there was $0.4 million of unrecognized stock-based compensation expense for stock purchase rights that will be recognized over the remaining offering period, through November 2014. Due to the delay in filing its 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 its Annual Report on Form 10-K and (ii) the Company’s general public release of its revenues for the first quarter of 2014, which occurred on June 17, 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.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes	'
	Note 13. Income taxes
	The Company’s income tax expense for the three months ended March 31, 2014 and 2013 was primarily related to income taxes of the Company’s non-U.S. operations.
	The Company conducts its business globally and its operating income is subject to varying rates of tax in the United States, China and Japan. Consequently, the Company’s effective tax rate is dependent upon the geographic distribution of its earnings or losses and the tax laws and regulations in each geographical region. Historically, the Company has experienced net losses in the United States and in the short term, expects this trend to continue. One of the Company’s subsidiaries in China has historically qualified for a preferential 15% tax rate available for high technology enterprises as opposed to the statutory 25% tax rate. The Company intends to reapply for the preferential rate for 2014 to 2016.
	Due to historic losses in the US, the Company has a full valuation allowance on its US federal and state deferred tax assets. Management continues to evaluate the realizability of deferred tax assets and the related valuation allowance. If management's assessment of the deferred tax assets or the corresponding valuation allowance were to change, the Company would record the related adjustment to income during the period in which management makes the determination.
	As of March 31, 2014, there were no material changes to either the nature or the amounts of the uncertain tax positions previously determined for the year ended December 31, 2013.

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Basis of Presentation and Consolidation	'
	Basis of Presentation and Consolidation
	The condensed consolidated financial statements of NeoPhotonics Corporation (“NeoPhotonics” or the “Company”) as of March 31, 2014 and December 31, 2013 and for the three months ended March 31, 2014 and 2013, have been prepared in accordance with the instructions on Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In accordance with those rules and regulations, the Company has omitted certain information and notes normally provided in the Company’s annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, consisting only of normal recurring items, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the interim periods. The year-end condensed balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. generally accepted accounting principles (“U.S. GAAP”). These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. The results of operations for the three months ended March 31, 2014 are not necessarily indicative of the results expected for the entire fiscal year. All significant intercompany accounts and transactions have been eliminated.
	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.
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, warranty reserves and recognition of stock-based compensation, among others. Actual results could differ from these estimates.
Recent Accounting Pronouncements	'
	Recent accounting pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("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.
	In April 2014, the FASB issued 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 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 exists. This guidance is 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.

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Computation of Basic and Diluted Net Loss per Share	'
	The following table sets forth the computation of the basic and diluted net loss per share for the periods indicated (in thousands, except per share amounts):
		Three months ended
		March 31,
		2014			2013
	Numerator:
	Net loss	$	(12,588	)	$	(12,240	)
	Denominator:
	Weighted average shares used to compute basic and diluted net loss per share		31,610			30,574
	Basic and diluted net loss per share	$	(0.40	)	$	(0.40	)
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 March 31, 2014 and 2013 were as follows (in thousands):
		March 31,
		2014			2013
	Employee stock options		3,952			2,759
	Restricted stock units		1,134			849
	Employee stock purchase plan		469			484
	Common stock warrants		4			4
			5,559			4,096

Cash_Equivalents_and_Investmen1

Cash Equivalents and Investments (Tables)	3 Months Ended
	Mar. 31, 2014
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 equivalents and investments in marketable securities designated as available-for-sale (in thousands):
		As of March 31, 2014								As of December 31, 2013
		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	$	16	$	—	$	—	$	16	$	11	$	—	$	—		$	11
	Time deposits		—		—		—		—		6,540		—		—			6,540
	Short-term investments
	Money market funds		—		—		—		—		4,577		—		—			4,577
	Corporate bonds		4,571		—		—		4,571		6,708		3		(5	)		6,706
	Foreign bonds and notes		2,008		6		—		2,014		4,827		5		—			4,832
	Variable rate demand notes		1,700		—		—		1,700		1,801		—		—			1,801
	Total short-term investments		8,279		6		—		8,285		17,913		8		(5	)		17,916
	Total investments	$	8,295	$	6	$	—	$	8,301	$	24,464	$	8	$	(5	)	$	24,467
Maturities of Marketable Securities	'
	As of March 31, 2014 and December 31, 2013, maturities of marketable securities were as follows (in thousands):
		March 31,		December 31,
		2014		2013
	Less than 1 year	$	4,587	$	20,658
	Due in 1 to 2 years		2,014		2,008
	Due in 2 to 5 years		—		—
	Due after 5 years		1,700		1,801
	Total	$	8,301	$	24,467

Fair_Value_Disclosures_Tables

Fair Value Disclosures (Tables)	3 Months Ended
	Mar. 31, 2014
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 March 31, 2014								As of December 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Cash, cash equivalents and short-term investments
	Money market funds	$	16	$	—	$	—	$	16	$	4,588	$	—	$	—	$	4,588
	Time deposits		—		—		—		—		—		6,540		—		6,540
	Corporate bonds		—		4,571		—		4,571		—		6,706		—		6,706
	U.S. federal agencies		—		—		—		—		—		—		—		—
	Foreign bonds and notes		—		2,014		—		2,014		—		4,832		—		4,832
	Variable rate demand notes		—		1,700		—		1,700		—		1,801		—		1,801
		$	16	$	8,285	$	—	$	8,301	$	4,588	$	19,879	$	—	$	24,467
	Mutual funds held in Rabbi Trust	$	484	$	—	$	—	$	484	$	442	$	—	$	—	$	442
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 March 31, 2014								As of December 31, 2013
		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Contingent consideration (Note 10)	$	—	$	—	$	1,985	$	1,985	$	—	$	—	$	1,985	$	1,985
	Penalty payment derivative (Note 10)	$	—	$	—	$	425	$	425	$	—	$	—	$	239	$	239

Business_Combination_Tables

Business Combination (Tables)	3 Months Ended
	Mar. 31, 2014
Summary of Purchase Accounting and Tangible and Intangible Assets Acquired	'
	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	$	14,087
	Net receivable from LAPIS		(959	)
	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
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):
		Three Months Ended March 31, 2013
	Revenue	$	68,754
	Net loss	$	(5,277	)
	Basic and diluted net loss per share	$	(0.17	)

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2014
Accounts Receivable, Net	'
	Accounts receivable, net consists of the following (in thousands):
		March 31, 2014			December 31, 2013
	Accounts receivable	$	64,586		$	57,010
	Trade notes receivable		6,480			8,054
	Allowance for doubtful accounts		(419	)		(531	)
		$	70,647		$	64,533
Inventories	'
	Inventories consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Raw materials	$	27,876		$	26,379
	Work in process		22,844			14,341
	Finished goods (1)		17,229			24,188
		$	67,949		$	64,908
	(1)Finished goods inventory at customer vendor managed inventory locations was $4.9 million and $5.4 million as of March 31, 2014 and December 31, 2013, respectively.
Purchased Intangible Assets	'
	Purchased intangible assets consist of the following (in thousands):
		31-Mar-14								December 31, 2013
		Gross			Accumulated			Net		Gross		Accumulated			Net
		Assets			Amortization			Assets		Assets		Amortization			Assets
	Technology and patents	$	34,250		$	(26,337	)	$	7,913	$	34,524	$	(25,931	)	$	8,593
	Customer relationships		14,920			(9,967	)		4,953		15,004		(9,732	)		5,272
	Leasehold interest		1,373			(267	)		1,106		1,406		(266	)		1,140
	Noncompete agreements		950			(950	)		—		950		(950	)		—
		$	51,493		$	(37,521	)	$	13,972	$	51,884	$	(36,879	)	$	15,005
Amortization Expense of Purchased Intangible Assets	'
	Amortization expense relating to technology and patents and the leasehold interest intangible assets is included within cost of goods sold, and customer relationships within operating expenses. The following table presents details of the amortization expense of the Company’s purchased intangible assets as reported in the condensed consolidated statements of operations (in thousands):
		Three Months Ended
		March 31,
		2014			2013
	Cost of goods sold	$	714		$	428
	Operating expenses		379			321
	Total	$	1,093		$	749
Estimated Future Amortization Expense of Purchased Intangible Assets	'
	The estimated future amortization expense of purchased intangible assets as of March 31, 2014, is as follows (in thousands):
	2014 (remaining 9 months)	$	3,275
	2015		4,426
	2016		3,682
	2017		807
	2018		591
	Thereafter		1,191
		$	13,972
Accrued Expenses and Other Current Liabilities	'
	Accrued and other current liabilities consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Employee-related accrued expenses	$	14,449		$	12,297
	Other accrued expenses		11,372			11,346
	Penalty payment derivative		425			—
		$	26,246		$	23,643
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):
		Three Months Ended
		March 31,
		2014			2013
	Beginning balance	$	1,737		$	1,072
	Warranty accruals		289			26
	Settlements and adjustments		(357	)		86
	Ending balance	$	1,669		$	1,184
Other Noncurrent Liabilities	'
	Other noncurrent liabilities consist of the following (in thousands):
		March 31, 2014			December 31, 2013
	Pension and other employee-related	$	6,098		$	6,206
	Penalty payment derivative		—			239
	Other		1,346			1,542
		$	7,444		$	7,987

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Mar. 31, 2014
Restructuring and Related Costs	'
	The following table summarizes activity associated with restructuring obligations during the three months ended March 31, 2014 (in thousands):
		Facilities			Contract			Total
					Termination
	Restructuring obligations, December 31, 2013	$	211		$	66		$	277
	Restructuring costs incurred		—			—			—
	Cash payments		(27	)		(66	)		(93	)
	Non-cash settlements and other		—			—			—
	Restructuring obligations, March 31, 2014	$	184		$	—		$	184

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2014
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):
		31-Mar-14						31-Dec-13
		Carrying			Weighted			Carrying		Weighted
		Amount			Average			Amount		Average
					Interest					Interest
					Rate					Rate
	Notes payable	$	11,210				$	9,738		—
	Long-term debt:
	Acquisition-related	$	6,790		1.5	%	$	9,975		1.5	%
	Bank borrowings		22,750		3.15	%		24,500		2.92	%
			29,540					34,475
	Less: current portion of long-term debt		(10,395	)				(10,325	)
	Total long-term debt, net of current portion	$	19,145				$	24,150
Maturities of Long-term Debt	'
	At March 31, 2014, maturities of long-term debt were as follows (in thousands):
	2014 (remaining nine months)	$	5,250
	2015		10,395
	2016		10,395
	2017		3,500
		$	29,540

Japan_Pension_Plans_Tables

Japan Pension Plans (Tables)	3 Months Ended
	Mar. 31, 2014
Periodic Pension Cost	'
	Net periodic pension cost associated with these plans for the period from December 31, 2013 to February 28, 2014 included the following components (in thousands):
	Service cost	$	53
	Interest cost		13
	Amortization		1
	Net periodic pension costs	$	67

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Summary of Stock Based Compensation Expense	'
	The following table summarizes the stock-based compensation expense recognized for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Cost of goods sold	$	330		$	243
	Research and development		707			418
	Sales and marketing		373			238
	General and administrative		491			303
		$	1,901		$	1,202
Estimated Fair Value of Certain Stock-Based Awards Using Black-Scholes-Merton Valuation Model	'
	The Company estimated the fair value of certain stock-based awards using a Black-Scholes-Merton valuation model with the following assumptions:
			Three Months Ended March 31,
	Stock options		2014	2013
	Weighted-average expected term (years)		5.12	6.55
	Weighted-average volatility		72%	76%
	Risk-free interest rate		1.75%	1.08%
	Expected dividends		—  %	—  %
	Stock appreciation units
	Weighted-average expected term (years)		2.15	2.61
	Weighted-average volatility		59%	63%
	Risk-free interest rate		0.13% – 0.78%	0.20% – 0.46%
	Expected dividends		—  %	—  %
	ESPP
	Weighted-average expected term (years)		0.76	0.74
	Weighted-average volatility		54%	48%
	Risk-free interest rate		0.10 – 0.13%	0.13 – 0.16%
	Expected dividends		—  %	—  %

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Loss per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Numerator:	'	'
Net loss	($12,588)	($12,240)
Denominator:	'	'
Weighted average shares used to compute basic and diluted net loss per share	31,610	30,574
Basic and diluted net loss per share	($0.40)	($0.40)

Potentially_Dilutive_Securitie

Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss per Share Attributable to Common Stockholders (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'
Potentially dilutive securities, excluded from computation of diluted net income (loss) per share	5,559	4,096
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	3,952	2,759
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	1,134	849
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	469	484
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	4

Summary_of_Unrealized_Gains_an

Summary of Unrealized Gains and Losses Related to Cash Equivalents and Investments in Marketable Securities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	$8,295	$24,464
Gross Unrealized Gains	6	8
Gross Unrealized Losses	'	-5
Fair Value	8,301	24,467
Cash and Cash Equivalents | Money Market Funds	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	16	11
Gross Unrealized Losses	'	'
Fair Value	16	11
Cash and Cash Equivalents | Time deposits	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	'	6,540
Gross Unrealized Losses	'	'
Fair Value	'	6,540
Short-term Investments	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	8,279	17,913
Gross Unrealized Gains	6	8
Gross Unrealized Losses	'	-5
Fair Value	8,285	17,916
Short-term Investments | Money Market Funds	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	'	4,577
Gross Unrealized Losses	'	'
Fair Value	'	4,577
Short-term Investments | Corporate Bonds	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	4,571	6,708
Gross Unrealized Gains	'	3
Gross Unrealized Losses	'	-5
Fair Value	4,571	6,706
Short-term Investments | Foreign Bonds and Notes	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	2,008	4,827
Gross Unrealized Gains	6	5
Gross Unrealized Losses	'	'
Fair Value	2,014	4,832
Short-term Investments | Variable Rate Demand Notes	'	'
Schedule Of Available For Sale Securities [Line Items]	'	'
Amortized Cost	1,700	1,801
Gross Unrealized Losses	'	'
Fair Value	$1,700	$1,801

Maturities_of_Marketable_Secur

Maturities of Marketable Securities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Investments [Line Items]	'	'
Less than 1 year	$4,587	$20,658
Due in 1 to 2 years	2,014	2,008
Due in 2 to 5 years	'	'
Due after 5 years	1,700	1,801
Total	$8,301	$24,467

Fair_Value_of_Financial_Assets

Fair Value of Financial Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	$8,301	$24,467
Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	16	4,588
Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	8,285	19,879
Money Market Funds	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	16	4,588
Money Market Funds | Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	16	4,588
Time deposits	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	6,540
Time deposits | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	6,540
Corporate Bonds	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	4,571	6,706
Corporate Bonds | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	4,571	6,706
U.S. Federal Agencies	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	'
U.S. Federal Agencies | Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	'
U.S. Federal Agencies | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	'
U.S. Federal Agencies | Fair Value, Inputs, Level 3	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	'	'
Foreign Bonds and Notes	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	2,014	4,832
Foreign Bonds and Notes | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	2,014	4,832
Variable Rate Demand Notes	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	1,700	1,801
Variable Rate Demand Notes | Fair Value, Inputs, Level 2	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	1,700	1,801
Mutual Funds Held in Rabbi Trust	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	484	442
Mutual Funds Held in Rabbi Trust | Fair Value, Inputs, Level 1	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Assets, fair value	$484	$442

Fair_Value_of_Financial_Liabil

Fair Value of Financial Liabilities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Liabilities, fair value	$1,985	$1,985
Penalty payment derivative	425	239
Fair Value, Inputs, Level 3	'	'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'	'
Liabilities, fair value	1,985	1,985
Penalty payment derivative	$425	$239

Business_Combination_Additiona

Business Combination - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 29, 2013	Mar. 31, 2013	Mar. 29, 2013
			Business Combinations	Business Combinations	Notes Payable
					Business Combinations
Business Acquisition [Line Items]	'	'	'	'	'
Total consideration	'	'	$24,258,000	'	'
Cash consideration paid	'	'	14,087,000	'	'
Liabilities assumed	'	'	'	'	11,130,000
Withheld and placed into escrow	'	'	2,000,000	'	'
Net receivable from LAPIS	'	'	959,000	'	'
Acquisition-related transaction costs	'	4,510,000	'	'	'
Revenue	'	'	'	1,900,000	'
Costs related to sales	$54,368,000	$44,306,000	'	$1,800,000	'

Acquisition_Accounting_and_Tan

Acquisition Accounting and Tangible and Intangible Assets Acquired (Detail) (Business Combinations, USD $)	1 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2013
Business Acquisition [Line Items]	'
Cash paid	$14,087
Net receivable from LAPIS	-959
Total consideration	24,258
Inventory	13,309
Other current assets	35
Land, property, plant and equipment	14,433
Fair Value of assets acquired	33,077
Developed Technology	'
Business Acquisition [Line Items]	'
Intangible assets acquired	2,120
Customer Relationships	'
Business Acquisition [Line Items]	'
Intangible assets acquired	3,180
Other Liability	'
Business Acquisition [Line Items]	'
Pension and retirement obligations	6,471
Other compensation-related liabilities	1,083
Other current liabilities	1,265
Liabilities assumed	8,819
Notes Payable	'
Business Acquisition [Line Items]	'
Notes payable	$11,130

Pro_forma_Information_for_Busi

Pro forma Information for Business Acquisition (Detail) (Business Combinations, USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014
Business Combinations	'
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]	'
Revenue	$68,754
Net loss	($5,277)
Basic and diluted net loss per share	($0.17)

Accounts_Receivable_Net_Detail

Accounts Receivable, Net (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts Notes And Loans Receivable [Line Items]	'	'
Accounts receivable	$64,586	$57,010
Trade notes receivable	6,480	8,054
Allowance for doubtful accounts	-419	-531
Accounts receivable, Net ,Total	$70,647	$64,533

Inventory_Detail

Inventory (Detail) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory [Line Items]	'		'
Raw materials	$27,876		$26,379
Work in process	22,844		14,341
Finished goods	17,229	[1]	24,188	[1]
Inventories	$67,949		$64,908
[1]	Finished goods inventory at customer vendor managed inventory locations was $4.9 million and $5.4 million as of March 31, 2014 and December 31, 2013, respectively.

Inventory_Parenthetical_Detail

Inventory (Parenthetical) (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory [Line Items]	'	'
Finished goods, at vendor managed inventory locations	$4.90	$5.40

Purchased_Intangible_Assets_De

Purchased Intangible Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	$51,493	$51,884
Accumulated Amortization	-37,521	-36,879
Net Assets	13,972	15,005
Technology and Patents	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	34,250	34,524
Accumulated Amortization	-26,337	-25,931
Net Assets	7,913	8,593
Customer Relationships	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	14,920	15,004
Accumulated Amortization	-9,967	-9,732
Net Assets	4,953	5,272
Leasehold Interest	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	1,373	1,406
Accumulated Amortization	-267	-266
Net Assets	1,106	1,140
Noncompete Agreements	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Gross Assets	950	950
Accumulated Amortization	($950)	($950)

Amortization_Expense_of_Compan

Amortization Expense of Company's Purchased Intangible Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Finite Lived Intangible Assets [Line Items]	'	'
Cost of goods sold	$714	$428
Amortization of purchased intangible assets	379	321
Operating expenses	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Amortization of purchased intangible assets	379	321
Cost Of Goods Sold And Operating Expense	'	'
Finite Lived Intangible Assets [Line Items]	'	'
Amortization of purchased intangible assets	$1,093	$749

Estimated_Future_Amortization_

Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Expected Amortization Expense [Line Items]	'	'
2014 (remaining 9 months)	$3,275	'
2015	4,426	'
2016	3,682	'
2017	807	'
2018	591	'
Thereafter	1,191	'
Net Assets	$13,972	$15,005

Accrued_and_Other_Current_Liab

Accrued and Other Current Liabilities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts Payable And Accrued Liabilities [Line Items]	'	'
Employee-related accrued expenses	$14,449	$12,297
Other accrued expenses	11,372	11,346
Penalty payment derivative	425	'
Accrued and other current liabilities	$26,246	$23,643

Summary_of_Movement_in_Warrant

Summary of Movement in Warranty Accrual (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Product Liability Contingency [Line Items]	'	'
Beginning balance	$1,737	$1,072
Warranty accruals	289	26
Settlements and adjustments	-357	86
Ending balance	$1,669	$1,184

Other_Noncurrent_Liabilities_D

Other Noncurrent Liabilities (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Non Current Liabilities [Line Items]	'	'
Pension and other employee-related	$6,098	$6,206
Penalty payment derivative	'	239
Other	1,346	1,542
Other noncurrent liabilities	$7,444	$7,987

Summary_of_Restructuring_Activ

Summary of Restructuring Activity (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2013	$277
Restructuring costs incurred	'
Cash payments	-93
Non-cash settlements and other	'
Restructuring obligations, March 31, 2014	184
Facilities	'
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2013	211
Restructuring costs incurred	'
Cash payments	-27
Non-cash settlements and other	'
Restructuring obligations, March 31, 2014	184
Contract Termination	'
Restructuring Cost And Reserve [Line Items]	'
Restructuring obligations, December 31, 2013	66
Restructuring costs incurred	'
Cash payments	-66
Non-cash settlements and other	'

Components_of_Debt_Obligations

Components of Debt, Obligations, Weighted Average Interest Rate and Additional Fair Value Information Relating to Outstanding Debt Instruments (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Notes payable, carrying amount	$11,210	$9,738
Long-term debt, carrying amount	29,540	34,475
Current portion of long-term debt, carrying amount	-10,395	-10,325
Total long-term debt, net of current portion, carrying amount	19,145	24,150
Bank borrowings	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, carrying amount	22,750	24,500
Weighted Average Interest Rate	3.15%	2.92%
NeoPhotonics Semiconductor	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, carrying amount	$6,790	$9,975
Weighted Average Interest Rate	1.50%	1.50%

Debt_Additional_Information_De

Debt - Additional Information (Detail)

3 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

1 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 29, 2013

Mar. 29, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 29, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

31-May-14

19-May-14

Mar. 31, 2014

Mar. 31, 2014

Jun. 30, 2014

Jun. 30, 2014

23-May-14

23-May-14

31-May-14

Jun. 30, 2014

USD ($)

USD ($)

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

Revolving Credit Facility

NeoPhotonics Semiconductor

Notes Payable

Notes Payable

Notes Payable

Notes Payable

Term Loan

Term Loan

Term Loan

Term Loan

Subsequent Event

Subsequent Event

China

China

China

China

China

China

China

China

USD ($)

USD ($)

Libor Plus Rate

Credit Facility Base Rate

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

NeoPhotonics Semiconductor

USD ($)

USD ($)

Libor Plus Rate

Credit Facility Base Rate

USD ($)

USD ($)

CreditFacility

Second Credit Facility

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

Subsequent Event

USD ($)

USD ($)

JPY (¥)

Notes Payable To be paid in three equal installments

USD ($)

CNY

USD ($)

CNY

USD ($)

First Credit Facility

JPY (¥)

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted cash

$2,953,000

$2,138,000

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,400,000

'

'

'

'

'

'

'

'

'

Bank Acceptances Executed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

'

Number of short-term line of credit facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

Credit facility, expiration date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30-Jun-14

'

'

'

'

'

30-Jun-15

Short-term line of credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,700,000

160,000,000

'

'

'

'

Percentage of compensating balance requirement for bank acceptance drafts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

25.00%

'

'

'

'

Short-term borrowing capacity

'

'

20,000,000

'

'

'

'

'

'

'

'

28,000,000

'

'

'

'

'

'

'

19,300,000

120,000,000

'

'

'

'

Notes payable

'

'

'

'

'

'

'

11,130,000

'

'

1,050,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable outstanding

'

'

'

'

'

'

'

'

6,800,000

700,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Obligation bear interest

'

'

'

'

'

'

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.00%

7.00%

'

'

Line Of Credit Facility Amount Outstanding

'

'

0

0

'

'

'

'

'

'

'

22,800,000

24,500,000

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate description

'

'

'

'

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

'

'

'

'

'

'

'Borrowings under the term loan bear interest at an interest rate option of a base rate as defined in the agreement plus 2.0% or LIBOR plus 3.0%.

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility, marginal interest rate

'

'

'

'

2.75%

1.75%

'

'

'

'

'

'

'

3.00%

2.00%

'

'

'

'

'

'

'

'

'

'

Line of credit facility, interest rate

'

'

'

'

2.90%

'

'

'

'

'

'

'

'

3.15%

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility, expiration date

'

'

'2016-03

'

'

'

'

'

'

'

'

'2017-07

'

'

'

'

'

'

'

'

'

'

'

'

'

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 certain 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 March 31, 2014, which noncompliance was effectively waived in the amendment described below.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

Maturities_of_Long_Term_debt_O

Maturities of Long -Term debt Outstanding (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Short And Long Term Debt [Line Items]	'	'
2014 (remaining nine months)	$5,250	'
2015	10,395	'
2016	10,395	'
2017	3,500	'
Long-term debt, carrying amount	$29,540	$34,475

Japan_Pension_Plans_Additional

Japan Pension Plans - Additional Information (Detail) (USD $)	Mar. 31, 2014	Mar. 29, 2013	Feb. 28, 2014	Mar. 31, 2014	31-May-14
		CompensationPlan	DBCPP	DBCPP	DBCPP
					Subsequent Event
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'
Number of Defined Benefit Pension Plans	'	2	'	'	'
Plan assets	'	'	'	'	$2,000,000
Receivable from LAPIS	'	'	300,000	'	'
Defined Benefit Plan, Curtailments	'	'	'	100,000	'
Pension liability	5,700,000	'	'	'	'
Employer contributions	'	'	$15,000	'	'

Periodic_Pension_Cost_Detail

Periodic Pension Cost (Detail) (USD $)	2 Months Ended
In Thousands, unless otherwise specified	Feb. 28, 2014
Defined Benefit Plan Disclosure [Line Items]	'
Service cost	$53
Interest cost	13
Amortization	1
Net periodic pension costs	$67

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

5-May-10

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Apr. 27, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Defendant

Private Placement

Private Placement

Private Placement

Private Placement

Private Placement

Private Placement

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Santur Corporation

Santur Corporation

Scenario, Plan

Scenario, Plan

Embedded Derivative Financial Instruments

Capital Addition Purchase Commitments

Research and Development Arrangement

Performance Guarantee

Fair Value, Inputs, Level 3

Private Placement

Santur Corporation

Minimum

Commitments And Contingencies Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of defendants

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Agreement period not to refile claims

'90 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Probable or reasonably possible loss

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating Leases, Future Minimum Payments Due

'

6,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rent expense

'

500,000

600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Year of acquisition

'

12-Oct-11

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount received from escrow ,net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,900,000

Amount of indemnification claims by the company

'

'

'

'

'

'

'

'

'

'

'

'

3,900,000

'

'

'

Liabilities, fair value

'

1,985,000

'

1,985,000

'

'

'

'

'

'

1,985,000

1,985,000

'

2,000,000

'

'

Other non-current liability

'

'

'

'

'

'

5,000,000

15,000,000

15,000,000

30,000,000

'

'

'

'

'

'

Percentage of investment obligation that must be spent inside Russia

'

'

'

'

'

80.00%

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of common stock, net of issuance costs

'

'

'

'

39,800,000

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,800,000

'

Targeted expansion completion date

'

'

'

'

'

31-Jul-14

'

'

'

'

'

'

'

'

'

'

Extended date for achievement of Investment Obligation

'

'

'

'

'

31-Mar-15

'

'

'

'

'

'

'

'

'

'

Penalty payment derivative

'

$425,000

'

$239,000

'

'

'

'

'

'

$425,000

$239,000

'

'

'

'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
		Employee Stock Options	Employee Stock Purchase Plan	Common Stock Warrants
Class Of Stock [Line Items]	'	'	'	'
Common stock	'	7,076,987	969,878	4,482
Accumulated deficit subject to restriction	$6.50	'	'	'
Accumulated profits	10.00%	'	'	'

Summary_of_StockBased_Compensa

Summary of Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Allocated share based compensation expense	$1,901	$1,202
Cost of Goods Sold	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Allocated share based compensation expense	330	243
Research and Development Expense	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Allocated share based compensation expense	707	418
Selling and Marketing Expense	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Allocated share based compensation expense	373	238
General and Administrative Expense	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'
Allocated share based compensation expense	$491	$303

Estimated_Fair_Value_of_Certai

Estimated Fair Value of Certain Stock-Based Awards Using Black-Scholes-Merton Valuation Model (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Stock Options	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Weighted-average expected term (years)	'5 years 1 month 13 days	'6 years 6 months 18 days
Weighted-average volatility	72.00%	76.00%
Risk-free interest rate	1.75%	1.08%
Expected dividends	'	'
Stock Appreciation Units (SARs)	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Weighted-average expected term (years)	'2 years 1 month 24 days	'2 years 7 months 10 days
Weighted-average volatility	59.00%	63.00%
Expected dividends	'	'
Risk-free interest rate Minimum	0.13%	0.20%
Risk-free interest rate Maximum	0.78%	0.46%
Employee Stock Purchase Plan	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Weighted-average expected term (years)	'9 months 4 days	'8 months 27 days
Weighted-average volatility	54.00%	48.00%
Expected dividends	'	'
Risk-free interest rate Minimum	0.10%	0.13%
Risk-free interest rate Maximum	0.13%	0.16%

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Employee Stock Options	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Shares granted	20,600	17,800
Weighted-average fair value of options granted	$4.68	$3.80
Unexercised stock options outstanding	3,952,356	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	113,184	14,472
Restricted Stock Units	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Shares granted	22,500	12,200
Weighted-average fair value granted	$7.98	$5.74
Shares outstanding	1,134,317	'
Stock Appreciation Units (SARs)	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Shares outstanding	414,655	'
Employee Stock Purchase Plan	'	'
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'
Unrecognized stock-based compensation expense	$0.40	'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (Subsidiaries, Foreign Country)	3 Months Ended
	Mar. 31, 2014
Subsidiaries | Foreign Country	'
Income Taxes [Line Items]	'
Effective income tax rate	15.00%
Income tax statutory rate	25.00%