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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested Outstanding Shares, Beginning balance | shares 64.5
Unvested Shares, Granted | shares 21.8
Unvested Shares, Vested | shares (16.8)
Unvested Shares, Forfeited | shares (3.1)
Unvested Outstanding Shares, Ending balance | shares 66.4
Unvested Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 7.43
Unvested Weighted Average Grant Date Fair Value, Granted | $ / shares 10.12
Unvested Weighted Average Grant Date Fair Value, Vested | $ / shares 6.36
Unvested Weighted Average Grant Date Fair Value, Forfeited | $ / shares 6.92
Unvested Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 8.61
Unvested, Aggregate Intrinsic Value of Unvested RSU | $ $ 636.0
Unvested, Aggregate Intrinsic Value of Unvested RSU | $ $ 500.0