Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Options (Details)

v3.21.2
Stock-Based Compensation - Options (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Options    
Outstanding at the beginning of the period (in shares) | shares 438,040  
Exercised (in shares) | shares (44,079)  
Forfeited (in shares) | shares (1,277)  
Outstanding at the end of the period (in shares) | shares 392,684 438,040
Options exercisable (in shares) | shares 353,781  
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 36.28  
Exercised (in dollars per share) 20.87  
Forfeited (in dollars per share) 49.02  
Outstanding at the end of the period (in dollars per share) 37.97 $ 36.28
Weighted-average exercise price, options exercisable (in dollars per share) $ 36.75  
Weighted-Average Remaining Contractual Life    
Outstanding 3 years 7 months 6 days 4 years 1 month 6 days
Options exercisable 3 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding (in dollars) | $ $ 16,601 $ 20,156
Options exercisable (in dollars) | $ $ 15,384  
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 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