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Fair Value Measurements - Summary of change in fair value of preferred stock warrant liability (Detail) - Preferred Stock Warrant Liability [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]    
Fair value, Beginning Balance $ 433 $ 442
Issuance of new warrants 271  
Change in fair value 153 (9)
Warrant exercises (857)  
Fair value, Ending Balance $ 0 $ 433