XML 87 R76.htm IDEA: XBRL DOCUMENT v3.20.2
Stock Plans and Stock-Based Compensation - Performance-Based Restricted Stock Units - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation expense $ 13,351 $ 8,301 $ 34,939 $ 24,094
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     242,827  
Stock-based compensation expense 6,400 $ 3,100 $ 16,100 $ 6,700
Award achievement probability percentage     100.00%  
Weighted-average grant date fair values of units granted     $ 120.11 $ 82.63
Number of stock units vested     4,500 0
Unrecognized compensation expense $ 39,600   $ 39,600  
Weighted-average amortization period     1 year 10 months 17 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 $ 98.92 $ 158.95 $ 98.92