Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Options (Details)

v3.21.1
Stock-Based Compensation - Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Options    
Outstanding at the beginning of the period (in shares) 438,040  
Granted (in shares) 0  
Exercised (in shares) (27,043)  
Forfeited (in shares) 0  
Outstanding at the end of the period (in shares) 410,997 438,040
Options exercisable (in shares) 370,818  
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 36.28  
Granted (in dollars per share) 0  
Exercised (in dollars per share) 19.32  
Forfeited (in dollars per share) 0  
Outstanding at the end of the period (in dollars per share) 37.40 $ 36.28
Options exercisable (in dollars per share) $ 36.14  
Weighted-Average Remaining Contractual Life    
Outstanding 4 years 4 years 1 month 6 days
Options exercisable 3 years 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding (in dollars) $ 14,318 $ 20,156
Options exercisable (in dollars) $ 13,384  
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 9 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