Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss	$ (9,181)	$ (2,396)
Adjustments to reconcile net loss to net cash from operating activities
Depreciation of property and equipment	1,493	1,577
Amortization of intangible assets	571	108
Write-off of patent costs	771	300
450000	450	100
Stock-based compensation	7,196	5,926
Accretion (Amortization) of Discounts and Premiums, Investments	142
Changes in assets and liabilities
Accounts receivable	(268)	1,219
Inventories	(3,414)	(3,074)
Prepaid expenses and other assets	886	1,125
Accounts payable	5,409	1,479
Accrued expenses and other liabilities	(4,642)	(1,868)
Deferred revenue	(909)	(970)
Net cash (used in) provided by operating activities	(1,780)	3,526
Cash flows from investing activities
Purchases of property and equipment	(1,080)	(994)
Payments To Acquire Intangible Assets Purchased	(5,741)
Payments to Acquire Debt Securities, Available-for-sale	(4,844)
Sales of marketable securities	85	97
Maturities of marketable securities	9,400
Costs incurred in connection with patents	(573)	(475)
Net cash used in investing activities	(2,753)	(1,372)
Cash flows from financing activities
Proceeds from employee stock purchase plan	1,687	1,551
Payments of employee taxes related to vested restricted stock	(5,885)	(1,377)
Exercise of stock options		196
Proceeds from (Payments for) Other Financing Activities	(39)	(12)
Net cash (used in) provided by financing activities	(4,237)	358
Net change in cash and cash equivalents	(8,770)	2,512
Cash and cash equivalents
Beginning of period	74,237	116,260
End of period	$ 65,467	$ 118,772