Annual report pursuant to Section 13 and 15(d)

Convertible Instruments and Accrued Interest - Outstanding Balance (Details)

v3.22.2.2
Convertible Instruments and Accrued Interest - Outstanding Balance (Details) - USD ($)
$ in Thousands
May 31, 2022
May 31, 2021
May 31, 2020
Debt Instrument [Line Items]      
Convertible notes payable outstanding principal $ 38,319 $ 70,500  
Less: Unamortized debt discount and issuance costs (2,078) (7,753)  
Convertible notes payable, net 36,241 62,747  
Accrued interest on convertible notes 5,974 2,007  
Outstanding convertible notes payable, net and accrued interest 42,215 64,754  
Long-term Convertible Note - November 2020 Note      
Debt Instrument [Line Items]      
Convertible notes payable outstanding principal     $ 13,500
Less: Unamortized debt discount and issuance costs   (1,204)  
Convertible notes payable, net   12,296  
Accrued interest on convertible notes   1,258  
Outstanding convertible notes payable, net and accrued interest   13,554  
Long-term Convertible Note - April 2, 2021 Note      
Debt Instrument [Line Items]      
Convertible notes payable outstanding principal   9,819 28,500
Less: Unamortized debt discount and issuance costs (512) (3,232)  
Convertible notes payable, net 9,307 25,268  
Accrued interest on convertible notes 2,599 447  
Outstanding convertible notes payable, net and accrued interest 11,906 25,715  
Long-term Convertible Note - April 23, 2021 Note      
Debt Instrument [Line Items]      
Convertible notes payable outstanding principal   28,500 $ 28,500
Less: Unamortized debt discount and issuance costs (1,566) (3,317)  
Convertible notes payable, net 26,934 25,183  
Accrued interest on convertible notes 3,375 302  
Outstanding convertible notes payable, net and accrued interest $ 30,309 $ 25,485