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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 15,976 | $ 20,439
Alternative minimum tax credit carryforwards | 857 | 857
Accrued expenses and other timing | 983 | 1,344
Total gross deferred tax assets | 17,816 | 22,640
Less — valuation allowance | (17,518) | (22,195)
Net deferred tax assets | 298 | 445
Deferred tax liabilities: |  |
Property and equipment, principally due to differences in depreciation | (298) | (445)
Total gross deferred tax liabilities | (298) | (445)
Net deferred tax assets (liabilities) | $ 0 | $ 0

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