Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Summary of Operating Lease Balances (Details)

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Commitments and Contingencies - Summary of Operating Lease Balances (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2023
Nov. 30, 2022
May 31, 2023
Commitments and Contingencies.          
Operating lease costs $ 32,000.0 $ 46,400 $ 100,000 $ 100,000  
Right-of-use asset $ 332,000   $ 332,000   $ 400,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets, Noncurrent   Other Assets, Noncurrent   Other Assets, Noncurrent
Current operating lease liability $ 142,000   $ 142,000   $ 139,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities   Accrued Compensation And Non-financing Liabilities
Non-current operating lease liability $ 211,000   $ 211,000   $ 283,000
Total operating lease liability $ 353,000   $ 353,000   $ 422,000