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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred tax assets (liabilities): |  |  |
Accrual, write-down and other | $ 5,442 | $ 3,249 | $ 2,469
Depreciation and amortization |  | 257 | 76
Depreciation and amortization | (818) |  |
Net operating loss and credits carry forwards | 64,690 | 52,445 | 42,949
Total gross deferred tax assets (liabilities) | 69,314 | 55,951 | 45,494
Valuation allowance | (69,314) | (55,951) | (45,494)
Total net deferred tax assets | $ 0 | $ 0 | $ 0

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