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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 17,738 | $ 15,976
Alternative minimum tax credit carryforwards |  | 857
Accrued expenses and other timing | 1,100 | 983
Total gross deferred tax assets | 18,838 | 17,816
Less — valuation allowance | (18,903) | (17,518)
Net deferred tax assets | (65) | 298
Deferred tax liabilities: |  |
Property and equipment, principally due to differences in depreciation | 65 | (298)
Total gross deferred tax liabilities | 65 | (298)
Net deferred tax assets | $ 0 | $ 0

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