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v3.3.1.900

Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Tax credit carryforwards |  |  |
Undistributed earnings of foreign subsidiaries | $ 900 |  |
Reconciliation of income taxes provided at the federal statutory rate (35%) to actual income tax provision (benefit) |  |  |
Federal statutory rate | 35.00% |  |
Income tax benefit computed at U.S. statutory rate | $ (10,989) | $ (11,401) | $ (8,653)
State income tax (net of federal benefit) | 3 | 3 | 2
Foreign income tax at rate different from U.S. statutory rate | (15) | (12) | (11)
Research and development credits | (1,580) | (1,614) | (1,196)
Stock-based compensation | 123 | 130 | 91
Amortization of intangible assets | (100) | (100) | (100)
Valuation allowance changes affecting tax provision | 12,588 | 13,027 | 9,915
Other | 56 | 74 | 23
Income tax provision | 86 | 107 | 71
Domestic and foreign components of income (loss) before income tax provision (benefit) |  |  |
U.S. | (31,580) | (32,735) | (24,906)
Non-U.S. | 183 | 160 | 183
Loss before income taxes | (31,397) | $ (32,575) | $ (24,723)
Federal |  |  |
Tax credit carryforwards |  |  |
Foreign tax credit carryforward that began expiring in 2016 | 900 |  |
Research and development | Federal |  |  |
Tax credit carryforwards |  |  |
Tax credit carryforwards with expiration | 8,200 |  |
Research and development | State |  |  |
Tax credit carryforwards |  |  |
Tax credit carryforwards without expiration | $ 7,200 |  |

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