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Stock-Based Compensation - ESPP - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-Based Compensation        
Stock-based compensation expense $ 34,459 $ 26,852 $ 132,010 $ 73,751
ESPP        
Stock-Based Compensation        
Stock-based compensation expense $ 4,100 $ 3,700 $ 46,100 $ 17,800