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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Transition tax on foreign subsidiaries |  | $ 0 |  |
Amount of decrease in deferred tax assets |  | $ (19,800) |  |
Reconciliation of the U.S. statutory income tax rate to the effective income tax rate |  |  |  |
Federal income tax (benefit) at statutory rate |  | 34.00% | 34.00% | 34.00%
Permanent differences |  | (1.16%) | (0.85%) | (0.86%)
Federal research and development credits and adjustments |  | 2.36% | 2.43% | 2.64%
State income tax benefit, net of federal benefit |  | 5.80% | 5.70% | 5.77%
Tax reform deferred rate change |  | (72.21) |  |
Other (as a percent) |  | (0.36%) | (0.40%) | 0.28%
Change in valuation allowance |  | 31.57% | (40.88%) | (41.82%)
Deferred tax assets |  |  |  |
Net operating loss carryforwards |  | $ 41,436 | $ 48,682 |
Tax credit carryforwards |  | 5,896 | 4,833 |
Capitalized research and development |  | 1,879 | 3,394 |
Capitalized legal expenses |  | 1,156 | 1,597 |
Other differences |  | 1,048 | 1,335 |
Total deferred tax assets |  | 51,415 | 59,841 |
Valuation allowance |  | (51,415) | (59,841) |
Valuation allowance |  |  |  |
Recorded increase (decrease) in valuation allowance |  | (8,400) | $ 14,700 | $ 13,600
Federal |  |  |  |
Valuation allowance |  |  |  |
Net operating loss carryforwards |  | 152,100 |  |
Tax credit carryforwards |  | 4,500 |  |
State |  |  |  |
Valuation allowance |  |  |  |
Net operating loss carryforwards |  | 150,400 |  |
Tax credit carryforwards |  | 1,800 |  |
Accounting Standards Update 2016-09 |  |  |  |
Valuation allowance |  |  |  |
Recorded increase (decrease) in valuation allowance |  | $ 200 |  |
Forecast |  |  |  |
Reconciliation of the U.S. statutory income tax rate to the effective income tax rate |  |  |  |
Federal income tax (benefit) at statutory rate | 21.00% |  |  |

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