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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Number of Shares, Opening Balance | shares 32,556,160
Number of Shares, Granted | shares 41,969,138
Number of Shares, Vested and converted to common stock | shares (15,779,232)
Number of Shares, Forfeited | shares (4,228,136)
Number of Shares, Ending Balance | shares 54,517,930
Weighted Average Grant Date Fair Value, Opening Balance | $ / shares $ 6.75
Weighted Average Grant Date Fair Value, Granted | $ / shares 13.30
Weighted Average Grant Date Fair Value, Vested and converted to common stock | $ / shares 10.21
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 13.20
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 10.29