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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 70,996 $ 63,551
Research and development credits 16,070 11,095
Other intangibles 3 4
Accruals and reserves 1,074 974
Stock-based compensation 5,185 4,551
Capitalized research and development 36,568 19,744
Lease liabilities 6,610 6,946
Total gross deferred tax assets 136,506 106,865
Less: valuation allowance (130,939) (100,778)
Total deferred tax assets, net 5,567 6,087
Fixed assets (1,771) (2,043)
Right-of-use assets (3,796) (4,044)
Total gross deferred tax liabilities (5,567) (6,087)
Net deferred tax assets $ 0 $ 0