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4. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 3 Months Ended
Aug. 31, 2018
Fair Value Disclosures [Abstract]  
Fair value by hierarchy

    The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of August 31, 2018 (in thousands):

 

    Balance as of
August 31, 2018		     Level 1     Level 2     Level 3  
Money market funds   $ 13,277     $ 13,277     $ --     $ --  
Certificate of deposit     80       --       80       --  
Assets   $ 13,357     $ 13,277     $ 80     $ --  

 

    The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of May 31, 2018 (in thousands):

 

    Balance as of
May 31, 2018		     Level 1     Level 2     Level 3  
Money market funds   $ 7,733     $ 7,733     $ --     $ --  
U.S. Treasury securities     5,983       5,983       --       --  
Certificate of deposit     80       --       80       --  
Assets   $ 13,796     $ 13,716     $ 80     $ --