| Component: (Network and Table) | |
|---|---|
| Network | 00500 - Statement - Consolidated Statements of Cash Flows (http://www.neophotonics.com/role/StatementConsolidatedStatementsOfCashFlows)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001227025 (http://www.sec.gov/CIK) | 
| Statement Of Cash Flows [Abstract] | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
Statement Of Cash Flows [Abstract]  | |||
Cash flows from operating activities  | |||
Net income (loss)  | (205,000)   | 3,668,000    | (19,719,000)   | 
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:  | |||
Depreciation and amortization  | |||
Stock-based compensation expense  | |||
Deferred taxes  | (  | (  | |
Amortization of investment, debt and other  | |||
Loss on disposal of property and equipment  | |||
Loss on foreign currency hedges  | |||
Allowance for doubtful accounts  | (  | (  | |
Write-down of inventories  | |||
Foreign currency remeasurement and other, net  | (  | (  | (  | 
Asset impairment charges  | 368,000    | 1,130,000    | |
Adjustment to fair value of Rusnano payment derivative  | (  | ||
Change in assets and liabilities, net of effects of acquisitions:  | |||
Accounts receivable  | (  | ||
Inventories  | (  | (  | |
Prepaid expenses and other assets  | (  | (  | (  | 
Accounts payable  | (  | ||
Accrued and other liabilities  | |||
Net cash provided by (used in) operating activities  | (  | ||
Cash flows from investing activities  | |||
Purchase of property, plant and equipment  | (  | (  | (  | 
Proceeds from sale of property, plant and equipment and other assets  | |||
Purchase of marketable securities  | (  | (  | (  | 
Proceeds from sale of marketable securities  | |||
Proceeds from maturity of marketable securities  | |||
Change in restricted cash  | (  | (  | |
Settlement of foreign currency hedges  | (  | ||
Acquisition of business, net  | (  | (  | |
Net cash used in investing activities  | (  | (  | (  | 
Cash flows from financing activities  | |||
Proceeds from exercise of stock options and issuance of stock under ESPP  | |||
Tax withholding on restricted stock units  | (  | (  | (  | 
Proceeds from (payments for) public stock offering, net of offering costs  | (  | (  | |
Proceeds from bank loans  | |||
Repayment of bank and acquisition-related loans  | (  | (  | (  | 
Proceeds from issuance of notes payable  | |||
Repayment of notes payable  | (  | (  | (  | 
Proceeds from government grants  | |||
Payment of acquisition-related contingent consideration  | (  | ||
Net cash provided by financing activities  | |||
Effect of exchange rates on cash and cash equivalents  | (  | (  | (  | 
Net increase (decrease) in cash and cash equivalents  | (  | ||
Cash and cash equivalents at the beginning of the period  | 76,088,000    | ||
Cash and cash equivalents at the end of the period  | 82,500,000    | 76,088,000    | 43,035,000    | 
Supplemental disclosure of cash flow information:  | |||
Cash paid for interest  | |||
Cash paid for income taxes  | |||
Supplemental disclosure of noncash investing and financing activities:  | |||
Receipt of restricted cash related to asset purchase agreement  | |||
Unpaid deferred offering costs  | |||
Changes in unpaid property, plant and equipment  | (  | (  | (  | 
Modification of bank loan with Comerica  | |||
Issuance of note to seller of acquired business  | |||
Transfer of restricted investments to short-term investments  | |||
Transfer of short-term investments to restricted investments  | |||