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Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets (DTAs): |  |
Net operating loss and tax credit carryforwards | $ 35,796 | $ 37,338
Unrealized mark-to-market, impairments and loss provisions | 3,753 | 15,203
Other realized / unrealized treatment differences | 12,131 | 21,600
Total deferred tax assets | 51,680 | 74,141
Less: valuation allowance | (51,680) | (74,141)
Net deferred tax assets | $ 0 | $ 0

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