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Share-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Stock Options 1,001,517
Options granted, Stock Options 2,663,084
Stock options exercised, Stock Options (2,236)
Ending balance, Stock Options 3,662,365
Vested and exercisable, Stock Options 958,709
Beginning balance, Weighted Average Exercise Price $ 1.13
Options granted, Weighted Average Exercise Price 2.21
Options Exercised, Weighted Average Exercise Price 0.72
Ending balance, Weighted Average Exercise Price 1.92
Vested and exercisable, Weighted Average Exercise Price $ 1.38
Weighted Average Remaining Contractual Life (in years) 8 years 8 months 12 days
Vested and exercisable, Weighted Average Remaining Contractual Life (in years) 7 years 1 month 6 days
Ending balance, Aggregate Intrinsic Value $ 51,591
Vested and exercisable, Aggregate Intrinsic Value $ 14,034