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Income Taxes - Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2023
Income Taxes |  |  |  |  |  |
Net deferred tax liability | $ 1,613 |  |  |  |  | $ 1,613
Income tax benefit |  | $ (227) |  |  |  |
Net operating loss carryforwards with no expiration date |  |  |  |  |  | 442,200
Foreign pre-tax loss | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Federal |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 618,400
Federal | R&D credit |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 46,700
State |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 1,000,000
State | R&D credit |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | $ 12,900

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