Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 15,882	$ 14,786
Tax credit carryforwards	1,165
Lease liability - current and non-current	62	202
Accrued expenses and other timing	741	1,047
Property and equipment, principally due to differences in depreciation	77	85
Total gross deferred tax assets	17,927	16,120
Less — valuation allowance	(17,875)	(15,941)
Net deferred tax assets	52	179
Deferred tax liabilities:
Right-of-use assets	(52)	(179)
Total gross deferred tax liabilities	(52)	(179)
Net deferred tax assets	$ 0	$ 0