Annual report pursuant to Section 13 and 15(d)

Loss Per Common Share - Securities Excluded from Computation of Earnings Per Share (Details)

v3.22.2.2
Loss Per Common Share - Securities Excluded from Computation of Earnings Per Share (Details) - shares
shares in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Stock options, warrants & unvested restricted stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 106,002 82,386 131,361
Convertible Debt Securities      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 12,000 18,000 3,864
Convertible Preferred Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 32,535 33,008 30,130