Quarterly report [Sections 13 or 15(d)]

Summary of Significant Accounting Policies - Cash and cash equivalents (Details)

v3.25.2
Summary of Significant Accounting Policies - Cash and cash equivalents (Details) - Fair value on a recurring basis - USD ($)
$ in Thousands
Aug. 31, 2025
May 31, 2025
Cost or amortized cost | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash $ 1,697 $ 534
Cost or amortized cost | Money market funds | Level 1 securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 2,603 11,369
Cost or amortized cost | U.S. treasuries | Level 2 securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 5,032  
Total estimated fair value | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 1,697 534
Total estimated fair value | Money market funds | Level 1 securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash 2,603 $ 11,369
Total estimated fair value | U.S. treasuries | Level 2 securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash $ 5,032