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Stockholders' Equity - Summary of Nonvested Shares (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Restricted Stock Units (RSUs)  
Number of Shares Underlying RSUs  
Unvested, beginning of period (in shares) | shares 632
Granted (in shares) | shares 162
Vested and released (in shares) | shares (254)
Forfeited (in shares) | shares (33)
Unvested, end of period (in shares) | shares 507
Weighted Average Grant Date Fair Value  
Unvested, beginning of period (in usd per share) | $ / shares $ 243.55
Granted (in usd per share) | $ / shares 599.47
Vested and released (in usd per share) | $ / shares 215.09
Forfeited (in usd per share) | $ / shares 343.14
Unvested, end of period (in usd per share) | $ / shares $ 365.16
Weighted Average Remaining Contractual Term (in years)  
Weighted average remaining contractual term 1 year 4 months 24 days
Aggregate Intrinsic Value  
Aggregate intrinsic value | $ $ 337,271
Market Performance Based Restricted Stock Units  
Number of Shares Underlying RSUs  
Unvested, beginning of period (in shares) | shares 227
Granted (in shares) | shares 177
Vested and released (in shares) | shares (230)
Unvested, end of period (in shares) | shares 174
Weighted Average Grant Date Fair Value  
Unvested, beginning of period (in usd per share) | $ / shares $ 430.50
Granted (in usd per share) | $ / shares 658.02
Vested and released (in usd per share) | $ / shares 513.73
Unvested, end of period (in usd per share) | $ / shares $ 551.57
Weighted Average Remaining Contractual Term (in years)  
Weighted average remaining contractual term 1 year 2 months 12 days
Aggregate Intrinsic Value  
Aggregate intrinsic value | $ $ 115,851