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Loss Per Common Shares (Tables)
9 Months Ended
Feb. 28, 2022
Earnings Per Share [Abstract]  
Schedule of securities excluded from computation of earnings per share

Three and nine months ended February 28,

(in thousands)

    

2022

    

2021

Stock options, warrants, and unvested restricted stock units

98,309

68,857

Convertible notes

12,000

12,000

Convertible preferred stock

32,197

32,159