Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Options, RSUs, PSUs (Details)

v3.21.4
Equity Awards and Warrants - Options, RSUs, PSUs (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
May 31, 2021
USD ($)
shares
Nov. 30, 2021
USD ($)
item
$ / shares
shares
Nov. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of active plans | item   1  
Number of inactive plans | item   1  
Annual increase in shares authorized, as a percent of outstanding shares   1.00%  
Shares available for future stock-based grants   18,800  
Options outstanding, vested   13,900  
Options outstanding, nonvested   13,700  
Proceeds from stock option exercises | $   $ 390 $ 48
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted, Shares   11,000  
Options term   10 years  
Stock option exercises, shares   500  
Proceeds from stock option exercises | $   $ 400  
Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted, exercise price | $ / shares   $ 2.23  
Stock options grant date fair value | $ / shares   1.71  
Stock options exercised, exercise price | $ / shares   1.06  
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option granted, exercise price | $ / shares   1.32  
Stock options grant date fair value | $ / shares   0.93  
Stock options exercised, exercise price | $ / shares   $ 0.63  
Restricted Stock Units (RSUs) [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  
Restricted Stock Units (RSUs) [Member] | One Particular Award To Management Or Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of common stock upon vesting of stock based compensation awards, shares   200  
Issuance of common stock upon vesting of stock based compensation awards, value | $ $ 300 $ 300  
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 400 400  
Issuance of common stock upon vesting of stock based compensation awards, value | $ $ 1,300    
Stock units granted, shares   4,350  
Stock units forfeited   3,900  
2012 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance   50,000  
Increase in number of shares authorized   6,300