Annual report pursuant to Section 13 and 15(d)

Equity Awards - Options, RSUs, PSUs (Details)

v3.22.2.2
Equity Awards - Options, RSUs, PSUs (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 01, 2021
Sep. 30, 2020
shares
Jan. 31, 2020
shares
May 31, 2022
USD ($)
plan
$ / shares
shares
May 31, 2021
USD ($)
shares
May 31, 2020
USD ($)
May 23, 2022
shares
Feb. 21, 2022
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of active plans | plan       1        
Number of inactive plans | plan       1        
Issuance of common stock upon vesting of stock based compensation awards, shares         200      
Stock option exercises, shares       500        
Proceeds from stock option exercises | $       $ 390 $ 1,839 $ 5,602    
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options exercised, exercise price | $ / shares       $ 1.06        
Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options exercised, exercise price | $ / shares       $ 0.63        
Executives                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares   3,350            
Management, Employees And Consultants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option granted, Shares       3,000        
Stock Options | Management, Employees And Consultants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years        
Options term       10 years        
Restricted Stock Units (RSUs) [Member] | Executives                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of common stock upon vesting of stock based compensation awards, shares       400        
Stock units granted, shares   1,120            
Award vesting period   3 years            
Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of common stock upon vesting of stock based compensation awards, shares       400        
Stock units granted, shares     11,700   4,350      
Stock units forfeited         3,900      
Performance Shares [Member] | Executives                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock units granted, shares   4,350            
Award vesting period   3 years            
2012 Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase in number of shares authorized       350,000        
Shares reallocated to be used for general purposes             7,000 15,000
Percentage of share outstanding       1.00%        
Annual increase in shares authorized, as a percent of outstanding shares 1.00%              
Shares available for future stock-based grants       3,900 56,300      
2012 Equity Incentive Plan | Management, Employees And Consultants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for future stock-based grants       22,000