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Equity Awards and Warrants (Tables)
3 Months Ended
Aug. 31, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option and Warrant Activity

Weighted 

average

Weighted

remaining

Aggregate

Number of

average

contractual

intrinsic

(in thousands, except per share data)

    

shares

    

exercise price

    

life in years

    

value

Options and warrants outstanding May 31, 2021

 

61,573

$

0.95

 

4.40

$

68,756

Granted

 

5,268

$

1.15

 

 

Exercised

 

(1,632)

$

0.66

 

 

Forfeited or expired and cancelled

 

(5,766)

$

0.73

 

 

Options and warrants outstanding August 31, 2021

 

59,443

$

0.99

 

4.14

$

36,673

Outstanding exercisable August 31, 2021

 

52,537

$

0.84

 

3.52

$

35,931