Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (2,802)	$ (5,235)	$ 528
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Stock-based compensation expense	910	905	996
Recovery of doubtful accounts	0	(3)	(58)
Depreciation and amortization	384	431	417
Loss on disposal of assets	45	0	0
Changes in operating assets and liabilities:
Accounts receivable	1,161	(2,043)	1,260
Inventories	1,164	(112)	(2,073)
Prepaid expenses and other	271	84	59
Accounts payable	(1,024)	210	(1,095)
Accrued expenses	(589)	402	62
Customer deposits and deferred revenue	(1,542)	(355)	(1,482)
Deferred rent	0	90	63
Income taxes payable	(2)	(11)	(28)
Net cash used in operating activities	(2,024)	(5,637)	(1,351)
Cash flows from investing activities:
Purchases of property and equipment	(163)	(173)	(572)
Net cash used in investing activities	(163)	(173)	(572)
Cash flows from financing activities:
Repayment of convertible notes	0	(6,110)	0
Proceeds from long-term debt	1,679	0	0
Proceeds from issuance of common stock under employee plans	503	559	925
Shares repurchased for tax withholdings on vesting of restricted stock units	(10)	0	0
Net cash provided by (used in) financing activities	2,172	(5,551)	925
Effect of exchange rates on cash, cash equivalents and restricted cash	20	(59)	43
Net increase (decrease) in cash, cash equivalents and restricted cash	5	(11,420)	(955)
Cash, cash equivalents and restricted cash, beginning of year	5,508	16,928	17,883
Cash, cash equivalents and restricted cash, end of year	5,513	5,508	16,928
Supplemental cash flow information:
Cash paid during the year for Income taxes	42	37	37
Cash paid during the year for Interest	0	610	550
Supplemental disclosure of non-cash flow information:
Net transfer of equipment between inventory and property and equipment	$ 112	$ 119	$ 0