Convertible Instruments and Accrued Interest - Outstanding Balance (Details) - USD ($) $ in Thousands	Aug. 31, 2025	May 31, 2025
Debt Instrument
Convertible notes payable outstanding principal	$ 27,200	$ 27,200
Accrued interest on convertible notes	16,577	18,151
Outstanding convertible notes payable, net and accrued interest	43,777	45,351
Long-term Convertible Note - April 2, 2021 Note
Debt Instrument
Convertible notes payable outstanding principal	2,831	2,831
Accrued interest on convertible notes	5,504	5,378
Outstanding convertible notes payable, net and accrued interest	8,335	8,209
Long-term Convertible Note - April 23, 2021 Note
Debt Instrument
Convertible notes payable outstanding principal	24,369	24,369
Accrued interest on convertible notes	11,073	12,773
Outstanding convertible notes payable, net and accrued interest	$ 35,442	$ 37,142