Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Outstanding Balance (Details)

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Convertible Instruments and Accrued Interest - Outstanding Balance (Details) - USD ($)
$ in Thousands
Feb. 29, 2024
May 31, 2023
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal $ 30,700 $ 36,450
Less: Unamortized debt discount and issuance costs (531) (1,319)
Convertible notes payable, net 30,169 35,131
Accrued interest on convertible notes 14,080 10,598
Outstanding convertible notes payable, net and accrued interest 44,249 45,729
Long-term Convertible Note - April 2, 2021 Note    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal 2,831 6,081
Less: Unamortized debt discount and issuance costs (58) (211)
Convertible notes payable, net 2,773 5,870
Accrued interest on convertible notes 4,446 3,804
Outstanding convertible notes payable, net and accrued interest 7,219 9,674
Long-term Convertible Note - April 23, 2021 Note    
Debt Instrument [Line Items]    
Convertible notes payable outstanding principal 27,869 29,369
Less: Unamortized debt discount and issuance costs (473) (822)
Convertible notes payable, net 27,396 28,547
Accrued interest on convertible notes 9,634 6,789
Outstanding convertible notes payable, net and accrued interest $ 37,030 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