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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities | $ 2,698 |  | $ 2,698 |
Domestic |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Taxable loss | (27,700) | $ (55,700) | (107,000) | $ (147,300)
Operating loss carryforwards | 675,200 |  | 675,200 |
Deferred tax assets, capital loss carryforwards | 199,700 |  | 199,700 |
Research and development tax credits | 10,100 |  | 10,100 |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 74,200 |  | 74,200 |
Generated After 2017 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 422,500 |  | $ 422,500 |

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