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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Amortization and depreciation | $ 61,098 | $ 51,370
Net operating loss carryforwards | 74,989 | 53,436
Tax credits | 13,827 | 11,777
Stock-based compensation | 4,054 | 5,524
Other | 3,867 | 1,804
Gross deferred tax assets | 157,835 | 123,911
Valuation allowance | (155,141) | (123,402)
Deferred tax assets net of valuation allowance | 2,694 | 509
Deferred tax liabilities: |  |
Right-of-use asset | (2,689) | (479)
Other | (5) | (30)
Net deferred tax assets | $ 0 | $ 0

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