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Income Taxes - Current/Deferred (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | 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 | $ 4 | $ 20 | $ 16 | $ 60 | 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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