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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