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Stock-Based Compensation and Employee Stock Purchase Program - Summary of Activity Under Stock Incentive Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]    
Shares Subject to Outstanding, Beginning Balance 80,078 60,002
Shares Subject to Outstanding, Options Granted 158,000 26,021
Shares Subject to Outstanding, Options Exercised 0 0
Shares Subject to Outstanding, Options Forfeited (11,197) (5,644)
Shares Subject to Outstanding, Options Expired (21,406) (301)
Shares Subject to Outstanding, Ending Balance 205,475 80,078
Shares Subject to Outstanding, Vested and expected to vest 188,554  
Shares Subject to Outstanding, Exercisable 43,059  
Weighted-Average Exercise Price Per Share, Outstanding Beginning Balance $ 85 $ 115
Weighted-Average Exercise Price Per Share, Options granted 3 6
Weighted-Average Exercise Price Per Share, Options exercised 0 0
Weighted-Average Exercise Price Per Share, Options forfeited 24 30
Weighted-Average Exercise Price Per Share, Options expired 129 121
Weighted Average Exercise Price Per Share, Outstanding Ending Balance 21 $ 85
Weighted Average Exercise Price Per Share, Vested and expected to vest 22  
Weighted Average Exercise Price Per Share, Exercisable $ 86  
Aggregate Intrinsic Value, Beginning Balance $ 0 $ 0
Aggregate Intrinsic Value, Options Granted 0 0
Aggregate Intrinsic Value, Options Exercised 0 0
Aggregate Intrinsic Value, Options Forfeited 397 39,062
Aggregate Intrinsic Value, Options Expired 0 0
Aggregate Intrinsic Value, Ending Balance 516,378 $ 0
Aggregate Intrinsic Value, Vested and expected to vest 463,513  
Aggregate Intrinsic Value, Exercisable $ 9,533