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Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred income tax benefit |  | $ 467 | $ 14,246 | $ 1,448 | $ 19,335
Deferred tax liabilities |  | 5,732 |  | 5,732 |
Domestic Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Taxable loss |  | 47,100 | 39,100 | 194,400 | 104,400
Current income tax expense (benefit) |  |  | (31) |  | 82
Operating and capital loss carryforwards |  | 564,100 |  | 564,100 |
Research and development tax credits |  | 9,200 |  | 9,200 |
Foreign Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Current income tax expense (benefit) |  | (45) | (45) | (167) | $ (282)
Operating loss carryforwards |  | 159,200 |  | 159,200 |
Generated After 2017 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating and capital loss carryforwards |  | $ 311,400 |  | $ 311,400 |
3.5% Convertible Notes Due 2023 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred income tax benefit | $ 13,367 |  | $ 13,367 |  |

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