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Stock-Based Compensation - Summary of Restricted Stock Activity (Detail)
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Unvested, RSU, beginning balance | shares 5,698
Granted, RSU | shares 2,166
Vested, RSU | shares (1,494)
Forfeited, RSU | shares (575)
Unvested, RSU, ending balance | shares 5,795
Unvested, Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares $ 26.10
Granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares 73.70
Vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares 22.41
Forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares 28.72
Unvested, Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares $ 44.58