Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Options (Details)

v3.20.2
Stock-Based Compensation - Options (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Options    
Outstanding at the beginning of the period (in shares) | shares 1,150,586  
Granted (in shares) | shares 0  
Exercised (in shares) | shares (587,121)  
Forfeited (in shares) | shares (7,213)  
Outstanding at the end of the period (in shares) | shares 556,252 1,150,586
Options exercisable (in shares) | shares 516,073  
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 25.66  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 18.02  
Forfeited (in dollars per share) 48.70  
Outstanding at the end of the period (in dollars per share) 33.44 $ 25.66
Options exercisable (in dollars per share) $ 32.22  
Weighted-Average Remaining Contractual Life    
Outstanding 3 years 10 months 24 days 3 years 4 months 24 days
Options exercisable 3 years 6 months  
Aggregate Intrinsic Value    
Outstanding (in dollars) | $ $ 24,324 $ 50,590
Options exercisable (in dollars) | $ $ 23,191  
Options to purchase common stock    
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Unrecognized compensation expense weighted-average recognition period 1 year 3 months 18 days  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Exercise prices of stock options outstanding (in dollars per share) $ 10.40  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Exercise prices of stock options outstanding (in dollars per share) $ 55.29