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Income Taxes - Narrative (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective tax rate |  | (0.07%) | 0.53% | 0.01% |
Deferred tax assets, valuation allowance |  | $ 49,439 | $ 45,364 | $ 64,300 |
Decrease in deferred tax asset, valuation allowance |  |  | 22,600 |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards expiration |  | 900 |  |  |
Unrecognized excess tax benefit | $ 1,600 |  |  |  |
Unrecognized tax benefits |  | 10,973 | 10,200 | $ 17,370 | $ 14,130
Unrecognized tax benefits that impact effective tax rate |  | 0 |  |  |
Federal |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 172,300 | 172,900 |  |
Tax credit carryforwards |  | $ 8,800 | 7,100 |  |
State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Impact of Tax Act in income tax rate (less than) |  | 0.01 |  |  |
Operating loss carryforwards |  | $ 38,500 | 38,500 |  |
Tax credit carryforwards |  | $ 9,700 | $ 8,300 |  |

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