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Share-Based Compensation - Summary of Stock Award Activity for the Period (Detail)
 9 Months Ended
Sep. 30, 2023
$ / shares
shares
Number of Shares  
Awards outstanding, Beginning balance (in shares) | shares 8,418,571
Granted (in shares) | shares 1,176,868
Forfeited (in shares) | shares (50,000)
Awards outstanding, Ending balance (in shares) | shares 9,545,439
Options exercisable (in shares) | shares 5,018,072
Options exercisable, weighted average remaining contractual term 6 years 7 months 6 days
Options vested and expected to vest (in shares) | shares 8,188,444
Options vested and expected to vest, weighted average remaining contractual term 7 years 6 months
Weighted Average Exercise Price  
Awards outstanding, Beginning balance (in usd per share) | $ / shares $ 2.17
Granted (in usd per share) | $ / shares 0.87
Forfeited (in usd per share) | $ / shares 1.29
Awards outstanding, Ending balance (in usd per share) | $ / shares 2.01
Options exercisable (in usd per share) | $ / shares 3.04
Options vested and expected to vest (in usd per share) | $ / shares $ 2.21