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4. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Feb. 28, 2017
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 February 28, 2017 (in thousands):

 

   Balance as of         
   February 28, 2017  Level 1  Level 2  Level 3
Money market funds  $804   $804   $—     $—   
Certificate of deposit   50    —      50    —   
Assets  $854   $804   $50   $—   

 

 The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of May 31, 2016 (in thousands):

 

   Balance as of         
   May 31, 2016  Level 1  Level 2  Level 3
Money market funds  $1   $1   $—     $—   
Certificate of deposit   50    —      50    —   
Assets  $51   $1   $50   $—