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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

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