Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Deferred tax assets
Stock-based compensation	$ 4,536	$ 3,803
Deferred revenue	1,596	2,032
Accrued expenses and compensation	1,144	1,058
Other	2,150	1,062
Research and development credit carryforwards	6,006	5,161
Net operating loss carryforwards	71,925	65,628
Total deferred tax assets	87,357	78,744
Valuation allowance	(87,357)	(78,744)	$ (76,130)	$ (101,031)
Net deferred tax assets	$ 0	$ 0

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