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Stockholders’ Equity and Stock-Based Compensation - Restricted Stock Unit (RSU) Activities (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of Shares    
Unvested beginning balance (in shares) 1,816  
RSUs granted (in shares) 726  
RSUs vested (in shares) (420)  
RSUs forfeited/canceled (in shares) (131)  
Unvested ending balance (in shares) 1,991 1,816
Weighted- Average Grant Date Fair Value Per Share    
Unvested beginning balance (in dollars per share) $ 215.68  
RSUs granted (in dollars per share) 348.85  
RSUs vested (in dollars per share) 207.96  
RSUs forfeited/canceled (in dollars per share) 241.98  
Unvested ending balance (in dollars per share) $ 264.14 $ 215.68
Restricted Stock Unit Activities, Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value    
Unvested, weighted average remaining contractual term (in years) 1 year 9 months 18 days 1 year 9 months 18 days
Unvested, aggregate intrinsic value $ 684,133 $ 527,574