Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants - Expense and unrecognized (Details)

v3.21.1
Stock Options and Warrants - Expense and unrecognized (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2020
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense         $ 9,053 $ 4,346
Vested during the period, grant date fair value         4,200 1,900
Unrecognized compensation expense     $ 13,900   $ 13,900  
Weighted average period over which unrecognized compensation expense is expected to be recognized         1 year 7 months 9 days  
Stock Options And Warrants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense     $ 1,900 $ 3,300 $ 7,400 $ 4,300
Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense $ 1,600 $ 1,600