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Stock-Based Compensation - Schedule of Profit Unit Interest (Detail) - Profit Unit Interest - $ / shares
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Units        
Outstanding beginning balance (in shares) 12,147 12,147 12,202 9,799
Granted (in shares) 0 0 0 2,414
Forfeited (in shares) (536) 0 (55) (11)
Exchanged in reverse recapitalization (in shares) (11,611)      
Outstanding ending balance (in shares) 0 12,147 12,147 12,202
Avg Fair Value at Grant Date        
Outstanding beginning balance (in dollars per share) $ 0.08 $ 0.08 $ 0.08 $ 0.05
Granted (in dollars per share) 0 0 0 0.17
Forfeited (in dollars per share) 0.10 0 0.08 0.03
Exchanged in reverse recapitalization (in dollars per share) 0.08      
Outstanding ending balance (in dollars per share) $ 0 $ 0.08 $ 0.08 $ 0.08