Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net loss	$ (2,888)	$ (1,977)
Adjustments to reconcile net loss to net cash used in operations
Depreciation of property and equipment	801	994
Amortization and write-off of patents	53	49
Provision for Doubtful Accounts	50	100
Stock-based compensation	3,156	3,070
Changes in assets and liabilities
Accounts receivable	855	1,056
Inventories	(1,490)	(138)
Prepaid expenses and other assets	828	(643)
Accounts payable	2,471	229
Accrued expenses and other liabilities	(4,291)	(5,240)
Deferred revenue	(819)	0
Net cash used in operating activities	(1,274)	(2,500)
Cash flows from investing activities
Purchases of property and equipment	(596)	(569)
Sales of marketable securities	51	47
Costs incurred in connection with patents	(79)	(455)
Net cash used in investing activities	(624)	(977)
Cash flows from financing activities
Shares withheld for payroll taxes	(1,058)	0
Exercise of stock options	71	306
Proceeds from (Payments for) Other Financing Activities	(5)	6
Net cash (used in) provided by financing activities	(992)	312
Net change in cash and cash equivalents	(2,890)	(3,165)
Cash and cash equivalents
Beginning of period	116,260	107,912
End of period	$ 113,370	$ 104,747