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Stock Plans and Stock-Based Compensation - Performance-Based Restricted Stock Units - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense $ 11,278 $ 8,282 $ 21,588 $ 16,131
Performance-Based Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, number of stock unit grants in period     118,422  
Stock-based compensation expense 5,200 $ 1,800 $ 9,800 $ 3,700
Award achievement probability percentage     100.00%  
Weighted-average grant date fair values of units granted     $ 108.57 $ 62.03
Number of stock units vested     0 0
Unrecognized compensation expense $ 31,600   $ 31,600  
Weighted-average amortization period     1 year 9 months 25 days  
Performance-Based Restricted Stock Units | Tranche One        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, compounded annual growth measurement period     2 years  
Share-based compensation, vesting stock percentage     50.00%  
Performance-Based Restricted Stock Units | Tranche Two        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, compounded annual growth measurement period     3 years  
Performance-Based Restricted Stock Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, thresholds percentage of revenue growth     20.00%  
Share price $ 82.23 $ 54.83 $ 82.23 $ 54.83
Performance-Based Restricted Stock Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation, thresholds percentage of revenue growth     40.00%  
Share price $ 158.95 $ 85.63 $ 158.95 $ 85.63