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Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |
Statutory federal income tax rate | $ (24,473) | $ (18,473)
State income taxes, net of federal tax benefits | (3,170) | (2,678)
Tax credits | (972) | (1,046)
Stock-based compensation | 728 | 986
Permanent items | 9 | 3
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds | 18,078 | 0
State rate differential | 32 | 274
NOL true-up | 2 | (337)
Other | 566 | 114
Goodwill impairment | 0 | 11,697
Change in valuation allowance | 9,200 | 9,460
Total provision for income taxes | $ 0 | $ 0

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