Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net loss	$ (1,977)	$ (1,858)
Adjustments to reconcile net loss to net cash used in operations
Depreciation of property and equipment	994	957
Amortization and write-off of patents	49	807
Provision for doubtful accounts	100	150
Stock-based compensation	3,070	3,450
Changes in assets and liabilities
Accounts receivable	1,056	(1,330)
Inventories	(138)	553
Prepaid expenses and other assets	(643)	1,314
Accounts payable	229	257
Accrued expenses and other liabilities	(5,240)	(6,376)
Net cash used in operating activities	(2,500)	(2,076)
Cash flows from investing activities
Purchases of property and equipment	(569)	(282)
Sales of marketable securities	47	0
Costs incurred in connection with patents	(455)	(170)
Net cash used in investing activities	(977)	(452)
Cash flows from financing activities
Exercise of stock options	306	84
Proceeds from (Payments for) Other Financing Activities	6	0
Net cash provided by financing activities	312	84
Net change in cash and cash equivalents	(3,165)	(2,444)
Cash and cash equivalents
Beginning of period	107,912	60,638
End of period	$ 104,747	$ 58,194