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Income Taxes - Current/Deferred (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net operating loss carryforwards |  |  |  |
U.S. federal corporate tax rate |  | 35.00% |  |
Federal AMT tax |  | $ 200 |  |
Current portion: |  |  |  |
State |  | 3 | $ 3 | $ 3
Foreign |  | 7 | 42 | 83
Income tax provision, Current |  | 10 | 45 | 86
Deferred portion: |  |  |  |
Federal |  | (243) |  |
Income tax provision |  | (233) | 45 | $ 86
Deferred tax assets: |  |  |  |
Federal and state loss carryforwards |  | 49,533 | 68,829 |
Reserves, accruals and other |  | 391 | 519 |
Depreciation and amortization |  | 1,100 | 1,718 |
Deferred stock-based compensation |  | 2,483 | 4,287 |
Research and development credit carryforwards |  | 15,487 | 13,867 |
Foreign tax and other credits |  | 513 | 536 |
Total deferred tax assets |  | 69,507 | 89,756 |
Deferred tax liabilities: |  |  |  |
Acquired intangible assets and other |  | 408 | 328 |
Less: Valuation allowance |  | (68,857) | (89,428) |
Net deferred tax assets |  | 242 | 0 |
Increase (Decrease) in valuation allowance during the year |  | 20,600 | $ 9,800 |
Forecast |  |  |  |
Net operating loss carryforwards |  |  |  |
U.S. federal corporate tax rate | 21.00% |  |  |
Federal |  |  |  |
Net operating loss carryforwards |  |  |  |
Net operating loss carryforwards, amount |  | 196,100 |  |
State |  |  |  |
Net operating loss carryforwards |  |  |  |
Net operating loss carryforwards, amount |  | $ 119,600 |  |

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