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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
Mar. 31, 2020
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense $ 10,310 $ 7,785
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 76,845  
Stock-based compensation expense $ 4,600 $ 1,900
Award achievement probability percentage 100.00%  
Weighted-average grant date fair values of units granted $ 97.23 $ 57.18
Number of stock units vested 0 0
Unrecognized compensation expense $ 32,000  
Weighted-average amortization period 1 year 10 months 24 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
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 $ 108.95 $ 64.86