4. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Aug. 31, 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 August 31, 2017 (in thousands):

	Balance as of August 31, 2017		Level 1		Level 2		Level 3
Money market funds	$	12,797	$	12,797	$	--	$	--
Certificate of deposit		50		--		50		--
Assets	$	12,847	$	12,797	$	50	$	--

    The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of May 31, 2017 (in thousands):

	Balance as of
	May 31, 2017		Level 1		Level 2		Level 3
Money market funds	$	15,516	$	15,516	$	--	$	--
Certificate of deposit		50		--		50		--
Assets	$	15,566	$	15,516	$	50	$	--