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Summary of RSU Activity (Detail) - Restricted Stock Units
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning Balance, Unvested, Number Outstanding | shares 682,563
Granted, Number Outstanding | shares 258,277
Vested, Number Outstanding | shares (335,631)
Forfeited, Number Outstanding | shares (71,788)
Ending Balance, Unvested, Number Outstanding | shares 533,421
RSUs vested but not released, Number Outstanding | shares 291,514
Beginning Balance, Unvested, Weighted Average Fair Value | $ / shares $ 4.34
Granted, Weighted Average Fair Value | $ / shares 14.03
Vested, Weighted Average Fair Value | $ / shares 5.57
Forfeited, Weighted Average Fair Value | $ / shares 4.43
Ending Balance, Unvested, Weighted Average Fair Value | $ / shares 8.25
RSUs vested but not released, Weighted Average Fair Value | $ / shares $ 5.13