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Stock-Based Compensation - Schedule of Non-vested Units (Detail) - Non-vested Units - $ / 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) 1,835 4,357 4,738 3,467
Granted (in shares) 0 0 0 2,414
Vested (in shares) (85) (2,522) (326) (1,132)
Forfeited (in shares) (536) 0 (55) (11)
Exchanged in reverse recapitalization (in shares) (1,214)      
Outstanding ending balance (in shares) 0 1,835 4,357 4,738
Avg Fair Value at Grant Date        
Outstanding beginning balance (in dollars per share) $ 0.20 $ 0.12 $ 0.12 $ 0.10
Granted (in dollars per share) 0 0 0 0.17
Vested (in dollars per share) 0.20 0.07 0.15 0.13
Forfeited (in dollars per share) 0.10 0 0.08 0.03
Exchanged in reverse recapitalization (in dollars per share) 0.22      
Outstanding ending balance (in dollars per share) $ 0 $ 0.20 $ 0.12 $ 0.12