5. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Feb. 28, 2019

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, 2019 (in thousands):

	Balance as of
	February 28, 2019		Level 1		Level 2		Level 3
Money market funds	$	10,581	$	10,581	$	--	$	--
Assets	$	10,581	$	10,581	$	--	$	--

    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	$	7,813	$	7,813	$	--	$	--
U.S. Treasury securities		5,983		5,983		--		--
Assets	$	13,796	$	13,796	$	--	$	--