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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Operating Loss Carryforwards [Line Items] |  |
Deferred income tax benefit | $ 508 | $ 4,074
Deferred tax liabilities | 6,720 |
Domestic Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Taxable income (loss) | 91,600 | (35,100)
Current income tax expense (benefit) |  | 113
Operating loss carryforwards | 460,700 |
Research and development tax credits | 8,300 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Current income tax expense (benefit) | (70) | $ (125)
Operating loss carryforwards | 158,876 |
Generated After 2017 |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 208,200 |

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