Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Operating Loss Carryforwards [Line Items]
Liability relating to unrecognized tax benefits	$ 711	$ 611	$ 597	$ 570
Federal
Operating Loss Carryforwards [Line Items]
Tax NOL carryforwards	296,409	269,433
Research and development credit carryforwards	5,039	4,314
State
Operating Loss Carryforwards [Line Items]
Research and development credit carryforwards	$ 2,069	$ 1,798