Income Taxes - Reconciliation of Income Taxes Computed at Blended Statutory Federal Income Tax Rate (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of the expected federal income tax expense at the statutory income tax rate to the actual tax expense
Federal income tax benefit computed at statutory rate	$ (34,883,000)	$ (2,561,000)	$ (6,005,000)
State income taxes, net of related federal tax benefit	159,000	181,000	314,000
Increase in federal valuation allowance	34,586,000	2,291,000	5,182,000
Federal tax credits	(91,000)	(294,000)	(200,000)
Stock option expiration/deficiencies	620,000	548,000	586,000
Federal tax rate change	(21,000)		(19,000)
Other, net	(170,000)	81,000	3,000
Total	$ 221,000	$ 246,000	$ (139,000)