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INCOME TAXES - Summary of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 46,604 | $ 46,691
Asset reserves | 2,063 | 1,713
Deferred research and development costs | 1,634 | 1,356
Intangibles | 244 | 539
Deferred gain on assets under sale-leaseback transaction | 125 | 331
Stock-based compensation | 607 | 377
Other | 285 | 379
Deferred tax assets, gross | 51,562 | 51,386
Deferred tax liabilities: |  |
Fixed assets | (706) | (528)
Deferred Tax Assets, Gross | 51,562 | 51,386
Deferred tax assets, net | 50,856 | 50,858
Valuation allowance | (23,186) | (23,134)
Deferred tax assets, net of allowance | $ 27,670 | $ 27,724

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