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Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 60,047 | $ 56,482
Capitalized research expenditures | 34,947 | 0
Amortization | 24,262 | 14,295
Research and development credits | 17,205 | 9,296
Stock-based compensation | 6,422 | 3,759
Leases | 898 | 1,132
Accrued expenses | 893 | 1,952
Total gross deferred tax assets | 144,674 | 86,916
Less: Valuation allowance | (143,930) | (85,957)
Net deferred tax assets | 744 | 959
Deferred tax liabilities: |  |
Operating lease right-of-use asset | (744) | (959)
Total gross deferred tax liabilities | (744) | (959)
Net deferred tax assets | $ 0 | $ 0

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