Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2018		Nov. 30, 2017
Cash flows from operating activities:
Net (loss) income	$ (2,144)		$ 70
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Stock-based compensation expense	480		580
Recovery of doubtful accounts	(3)		(14)
Depreciation and amortization	230		190
Changes in operating assets and liabilities:
Accounts receivable	(1,068)		592
Inventories	(935)		(1,249)
Prepaid expenses and other assets	23		(1,135)
Accounts payable	302		(1,005)
Accrued expenses	(175)		5
Customer deposits and deferred revenue	231		(178)
Deferred rent	84		0
Income taxes payable	18		(9)
Net cash used in operating activities	(2,957)		(2,153)
Cash flows from investing activities:
Purchases of investments	0		(5,972)
Purchases of property and equipment	(103)		(313)
Net cash used in investing activities	(103)		(6,285)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee plans, net of taxes paid related to share settlement of equity awards	312		601
Net cash provided by financing activities	312		601
Effect of exchange rates on cash and cash equivalents	(98)		(7)
Net decrease in cash and cash equivalents	(2,846)		(7,844)
Cash and cash equivalents, beginning of period	16,848	[1]	17,803
Cash and cash equivalents, end of period	14,002		9,959
Supplemental disclosure of non-cash flow information:
Transfer of property and equipment to inventories	$ 0		$ 372

[1] The condensed consolidated balance sheet at May 31, 2018 has been derived from the audited consolidated financial statements at that date.