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Stock-based compensation - Summary of Restricted Stock Units (Detail) - Restricted stock units
shares in Thousands
9 Months Ended
Sep. 30, 2023
$ / shares
shares
Shares (in thousands)  
Unvested balance at beginning of period (in shares) | shares 2,415
Granted (in shares) | shares 3,117
Vested (in shares) | shares (987)
Forfeited (in shares) | shares (395)
Unvested balance at end of period (in shares) | shares 4,150
Weighted- average grant date fair value  
Unvested balance at beginning of period (in dollars per share) | $ / shares $ 11.44
Granted (in dollars per share) | $ / shares 4.90
Vested (in dollars per share) | $ / shares 14.71
Forfeited (in dollars per share) | $ / shares 8.50
Unvested balance at end of period (in dollars per share) | $ / shares $ 6.33