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Stock-Based Compensation - Summary of Stock Option Activity (Detail)
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Options outstanding | shares 34,709,027
Granted | shares 0
Exercised | shares (3,336,683)
Forfeited | shares (459,787)
Expired | shares (2,595)
Ending Options outstanding | shares 30,909,962
Nonvested options, Shares | shares 22,213,714
Vested and exercisable, Shares | shares 9,140,656
Beginning Weighted- Average Exercise Price Options outstanding | $ / shares $ 0.64
Weighted- Average Exercise Price Granted | $ / shares 0
Weighted- Average Exercise Price Exercised | $ / shares 0.45
Weighted- Average Exercise Price Forfeited | $ / shares 0.66
Weighted- Average Exercise Price Expired | $ / shares 0.69
Ending Weighted- Average Exercise Price Options outstanding | $ / shares 0.66
Nonvested options, Weighted- Average Exercise Price | $ / shares 0.71
Vested and exercisable, Weighted- Average Exercise Price | $ / shares $ 0.53