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Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets (DTAs): |  |
Net operating loss and tax credit carryforwards | $ 99,327 | $ 97,655
Unrealized mark-to-market, impairments and loss provisions | 13,649 | 12,609
Other realized / unrealized treatment differences | (28,061) | (28,620)
Total deferred tax assets | 84,915 | 81,644
Less: valuation allowance | (84,915) | (81,644)
Net deferred tax assets | $ 0 | $ 0

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