Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Activity (Detail)

v3.21.2
Equity Awards and Warrants - Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2021
May 31, 2021
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 61,573,000  
Granted, Number of Shares 5,268,000  
Exercised, Number of Shares (1,632,000)  
Forfeited/expired/cancelled, Number of Shares (5,766,000)  
Options and warrants outstanding, Number of Shares 59,443,000 61,573,000
Outstanding exercisable, Number of Shares 52,537,000  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.95  
Granted, Weighted Average Exercise Price 1.15  
Exercised, Weighted Average Exercise Price 0.66  
Forfeited/expired/cancelled, Weighted Average Exercise Price 0.73  
Options and warrants outstanding, Weighted Average Exercise Price 0.99 $ 0.95
Outstanding exercisable, Weighted Average Exercise Price $ 0.84  
Options and warrants outstanding, Weighted Average Remaining Contractual Life in Years 4 years 1 month 20 days 4 years 4 months 24 days
Outstanding exercisable, Weighted Average Remaining Contractual Life in Years 3 years 6 months 7 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 36,673 $ 68,756
Outstanding exercisable, Aggregate Intrinsic Value $ 35,931