Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative impact of adopting ASC Topic 606	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative impact of adopting ASC Topic 606
Beginning balance at Jun. 30, 2018	$ 99,182	$ (22,616)	$ 18	$ (49)	$ 210,139	$ (110,926)	$ (22,616)
Beginning balance, shares at Jun. 30, 2018			18,126,000	11,000
Share-based compensation expense	4,029				4,029
Shares issued under employee plans	120			$ (36)	156
Shares issued under employee plans, shares			81,000	8,000
Net loss	(2,006)					(2,006)
Ending balance at Jun. 30, 2019	78,709		$ 18	$ (85)	214,324	(135,548)
Ending balance, shares at Jun. 30, 2019			18,207,000	19,000
Issuance of common stock, net of issuance costs	34,811		$ 7		34,804
Issuance of common stock, net of issuance costs, shares			7,475,000
Share-based compensation expense	2,998				2,998
Shares issued under employee plans	390			$ (3)	393
Shares issued under employee plans, shares			111,000	1,000
Net loss	(45,892)					(45,892)
Ending balance at Jun. 30, 2020	$ 71,016		$ 25	$ (88)	$ 252,519	$ (181,440)
Ending balance, shares at Jun. 30, 2020			25,793,000	20,000