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Stock-based Compensation - Summary of Restricted Stock Unit Activity (Detail) - RSUs
6 Months Ended
Jun. 30, 2022
$ / shares
shares
Number of Units  
Unvested at beginning of period (in shares) | shares 3,577,000
Granted (in shares) | shares 5,310,000
Cancelled/forfeited (in shares) | shares (432,000)
Vested (in shares) | shares (663,000)
Unvested at ending of period (in shares) | shares 7,792,000
Weighted-
Average
Grant-
Date Fair
Value  
Unvested at beginning of period (in dollars per share) | $ / shares $ 21.52
Granted (in dollars per share) | $ / shares 13.96
Cancelled/forfeited (in dollars per share) | $ / shares 14.83
Vested (in dollars per share) | $ / shares 20.01
Unvested at ending of period (in dollars per share) | $ / shares $ 16.94