Quarterly report [Sections 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 9 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
May 31, 2025
Commitments and Contingencies.          
Operating lease costs $ 31,000 $ 26,000 $ 100,000 $ 100,000  
Right-of-use asset $ 33,000   $ 33,000   $ 130,000
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 $ 34,000   $ 34,000   $ 141,000
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
Total operating lease liability $ 34,000   $ 34,000   $ 141,000