Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Outstanding Balance (Details)

v3.23.4
Convertible Instruments and Accrued Interest - Outstanding Balance (Details) - USD ($)
$ in Thousands
Nov. 30, 2023
May 31, 2023
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal $ 33,700 $ 36,450
Less: Unamortized debt discount and issuance costs (786) (1,319)
Convertible notes payable, net 32,914 35,131
Accrued interest on convertible notes 12,936 10,598
Outstanding convertible notes payable, net and accrued interest 45,850 45,729
Long-term Convertible Note - April 2, 2021 Note    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal 4,081 6,081
Less: Unamortized debt discount and issuance costs (102) (211)
Convertible notes payable, net 3,979 5,870
Accrued interest on convertible notes 4,261 3,804
Outstanding convertible notes payable, net and accrued interest 8,240 9,674
Long-term Convertible Note - April 23, 2021 Note    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal 29,369 29,369
Less: Unamortized debt discount and issuance costs (607) (822)
Convertible notes payable, net 28,762 28,547
Accrued interest on convertible notes 8,675 6,789
Outstanding convertible notes payable, net and accrued interest 37,437 35,336
Placement Agent Notes    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal   1,000
Less: Unamortized debt discount and issuance costs   (286)
Convertible notes payable, net   714
Accrued interest on convertible notes   5
Outstanding convertible notes payable, net and accrued interest   $ 719
Short Term Notes    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal 250  
Less: Unamortized debt discount and issuance costs (77)  
Convertible notes payable, net 173  
Outstanding convertible notes payable, net and accrued interest $ 173