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Income Taxes - Current/Deferred (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income tax provision, Current portion: |  |  |
State | $ 3 | $ 3 | $ 3
Foreign | 42 | 83 | 104
Income tax provision | 45 | 86 | $ 107
Deferred tax assets: |  |  |
Federal and state loss carryforwards | 68,829 | 60,831 |
Reserves, accruals and other | 519 | 761 |
Depreciation and amortization | 1,718 | 1,304 |
Deferred stock-based compensation | 4,287 | 4,504 |
Research and development credit carryforwards | 13,867 | 12,886 |
Foreign tax and other credits | 536 | 1,131 |
Total deferred tax assets | 89,756 | 81,417 |
Deferred tax liabilities: |  |  |
Acquired intangible assets and other | 328 | 1,781 |
Less: Valuation allowance | (89,428) | (79,636) |
Net deferred tax assets | 0 | 0 |
Increase in valuation allowance during the year | 9,800 | $ 12,900 |
Federal |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards, amount | 184,100 |  |
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized | 5,700 |  |
State |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards, amount | 116,500 |  |
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized | $ 4,800 |  |

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