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Stockholders' Equity - Summary of Unvested Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]
9 Months Ended
Sep. 30, 2022
$ / shares
shares
Class of Stock [Line Items]  
Shares, Unvested as of January 1, 2022 | shares 11,718,813
Shares, Granted | shares 12,880,812
Shares, Vested | shares (4,254,928)
Shares, Forfeited | shares (2,012,379)
Shares, Unvested as of September 30, 2022 | shares 18,332,318
Weighted Average Grant Date Fair Value, Unvested as of January 1, 2022 | $ / shares $ 19.63
Weighted Average Grant Date Fair Value, Granted | $ / shares 4.21
Weighted Average Grant Date Fair Value, Vested | $ / shares 12.04
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 8.70
Weighted Average Grant Date Fair Value, Unvested as of September 30, 2022 | $ / shares $ 7.20