XML 95 R75.htm IDEA: XBRL DOCUMENT v3.21.1
Stock-based compensation - Summary of Performance-based and Market-based Stock Option Activity and Related Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Weighted-average exercise price      
Closing stock price (in USD per share)   $ 26.83  
Performance-based and Market-based Stock Options      
Options outstanding      
Beginning balance (in shares) 1,482,782 1,252,932 1,323,432
Exercised (in shares) (62,450) (144,340) (53,100)
Canceled or forfeited (in shares) (96,900)   (17,400)
Ending balance (in shares) 1,323,432 1,108,592 1,252,932
Weighted-average exercise price      
Beginning balance (in USD per share) $ 8.94 $ 7.97 $ 7.96
Exercised (in USD per share) 1.84 1.89 2.40
Canceled or forfeited (in USD per share) 26.84   26.84
Ending balance (in USD per share) $ 7.96 $ 8.72 $ 7.97
Weighted-average remaining contractual life (in years), Outstanding 6 years 4 years 5 years
Aggregate intrinsic values, Outstanding $ 8,646 $ 20,077 $ 7,487
Options outstanding, Exercisable (in shares)   808,592  
Weighted-average exercise price, Exercisable (in USD per share)   $ 2.00  
Weighted-average remaining contractual life (in years), Exercisable   3 years 3 months 18 days  
Aggregate intrinsic values, Exercisable   $ 20,077