Quarterly report pursuant to Section 13 or 15(d)

Equity Awards and Warrants - Activity (Detail)

v3.22.1
Equity Awards and Warrants - Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Feb. 28, 2022
May 31, 2021
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 61,573  
Granted, Number of Shares 40,557  
Exercised, Number of Shares (5,677)  
Forfeited/expired/cancelled, Number of Shares (13,395)  
Options and warrants outstanding, Number of Shares 83,058 61,573
Options and warrants outstanding and exercisable, Number of Shares 75,770  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.95  
Granted, Weighted Average Exercise Price 0.81  
Exercised, Weighted Average Exercise Price 0.71  
Forfeited/expired/cancelled, Weighted Average Exercise Price 1.26  
Options and warrants outstanding, Weighted Average Exercise Price 0.85 $ 0.95
Options and warrants outstanding and exercisable, Weighted Average Exercise Price $ 0.76  
Options and warrants outstanding, Weighted Average Remaining Contractual Life in Years 4 years 4 months 24 days 4 years 4 months 24 days
Options and warrants outstanding and exercisable, Weighted Average Remaining Contractual Life in Years 3 years 10 months 28 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 4,653 $ 68,756
Options and warrants outstanding and exercisable, Aggregate Intrinsic Value $ 4,651  
Stock option vested, Shares 11,300,000  
Options outstanding, nonvested 7,400,000