Quarterly report pursuant to Section 13 or 15(d)

Stock Options and Warrants (Detail)

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Stock Options and Warrants (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Nov. 30, 2020
May 31, 2020
Stock option and warrant activity    
Options and warrants outstanding, Number of Shares 131,361  
Granted, Number of Shares 5,486  
Exercised, Number of Shares (59,238)  
Forfeited/expired/cancelled, Number of Shares (533)  
Options and warrants outstanding, Number of Shares 77,076 131,361
Outstanding exercisable, Number of Shares 70,747  
Options and warrants outstanding, Weighted Average Exercise Price $ 0.65  
Granted, Weighted Average Exercise Price 3.61  
Exercised, Weighted Average Exercise Price 0.57  
Forfeited/expired/cancelled, Weighted Average Exercise Price 0.98  
Options and warrants outstanding, Weighted Average Exercise Price 0.88 $ 0.65
Outstanding exercisable, Weighted Average Exercise Price $ 0.71  
Options and warrants outstanding, Weighted Average Remaining Contractual Life in Years 4 years 4 months 17 days 5 years 9 months 14 days
Outstanding exercisable, Weighted Average Remaining Contractual Life in Years 3 years 11 months 19 days  
Options and warrants outstanding, Aggregate Intrinsic Value $ 143,788 $ 302,961
Outstanding exercisable, Aggregate Intrinsic Value $ 140,630