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Fair Value Measurement - Summary of Fair Value of Redeemable Convertible Preferred Stock Warrants Liability and Derivative Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Redeemable Convertible Preferred Stock Warrants        
Schedule Of Fair Value Of Redeemable Convertible Preferred Stock Warrants Liability And Derivative Liability [Roll Forward]        
Beginning balance $ 0 $ 840    
Change in fair value 0 1,024    
Reclassification to APIC upon recapitalization 0 0    
Ending balance 0 1,864 $ 0 $ 1,864
Derivative liability        
Schedule Of Fair Value Of Redeemable Convertible Preferred Stock Warrants Liability And Derivative Liability [Roll Forward]        
Beginning balance     0 135
Change in fair value     0 67
Ending balance $ 0 $ 202 $ 0 $ 202