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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carry forward | $ 120,544 | $ 62,346
Tax credits | 6,296 | 3,975
Accruals and reserves | 0 | 3,323
Stock-based compensation expense | 6,944 | 267
Lease liability (ASC 842) | 2,622 | 0
Accrued expenses | 0 | 0
Inventory reserves | 617 | 0
Other | 15 | 2
Total deferred tax assets | 137,038 | 69,913
Valuation allowance | (130,569) | (69,222)
Total deferred tax asset | 6,469 | 691
Depreciation and amortization | 1,185 | 691
Deferred Tax Liabilities, Prepaid Expenses | 2,983 | 0
Deferred Tax Liabilities, Leasing Arrangements | 2,301 | 0
Deferred tax liabilities: |  |
Total deferred tax liabilities | 6,469 | 691
Net deferred tax assets (liabilities) | $ 0 | $ 0

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