Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (5,780)	$ (2,888)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation of property and equipment	740	801
Amortization of intangible assets	234	53
Write-off of patent costs	505	0
Provision for doubtful accounts	75	50
Stock-based compensation	3,906	3,156
Accretion (Amortization) of Discounts and Premiums, Investments	(94)	0
Changes in assets and liabilities
Accounts receivable	1,316	855
Inventories	(1,431)	(1,490)
Prepaid expenses and other assets	763	828
Accounts payable	2,059	2,471
Accrued expenses and other liabilities	(7,490)	(4,291)
Deferred revenue	(523)	(819)
Net cash used in operating activities	(5,720)	(1,274)
Cash flows from investing activities
Purchases of property and equipment	(543)	(596)
Payments To Acquire Intangible Assets Purchased	5,741	0
Payments to Acquire Debt Securities, Available-for-sale	(4,844)	0
Sales of marketable securities	0	51
Maturities of marketable securities	7,400	0
Costs incurred in connection with patents	(325)	(79)
Net cash used in investing activities	(4,053)	(624)
Cash flows from financing activities
Payments of employee taxes related to vested restricted stock	(5,506)	(1,058)
Exercise of stock options	0	71
Proceeds from (Payments for) Other Financing Activities	(19)	(5)
Net cash used in financing activities	(5,525)	(992)
Net change in cash and cash equivalents	(15,298)	(2,890)
Cash and cash equivalents
Beginning of period	74,237	116,260
End of period	$ 58,939	$ 113,370