6. FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Nov. 30, 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 November 30, 2018 (in thousands):

	Balance as of
	November 30, 2018		Level 1		Level 2		Level 3
Money market funds	$	6,050	$	6,050	$	--	$	--
U.S. Treasury securities		5,991		5,991		--		--
Certificate of deposit		80		--		80		--
Assets	$	12,121	$	12,041	$	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	$	--