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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax liabilities | $ 2,574 |  | $ 2,574 |
Domestic |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Taxable loss | (24,700) | $ (26,900) | (82,200) | $ (133,900)
Operating loss carryforwards | 836,600 |  | 836,600 |
Deferred tax assets, capital loss carryforwards | 212,500 |  | 212,500 |
Research and development tax credits | 10,900 |  | 10,900 |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 76,800 |  | 76,800 |
Generated After 2017 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 583,900 |  | $ 583,900 |

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