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INCOME TAXES - Summary of net deferred tax assets (Details 2) - USD ($) $ in Thousands | Jun. 30, 2016 | Jun. 30, 2015
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 46,691 | $ 46,919
Asset reserves | 1,713 | 792
Deferred research and development costs | 1,356 | 1,009
Intangibles | 539 | 606
Deferred gain on assets under sale-leaseback transaction | 331 | 632
Stock-based compensation | 377 | 224
Other | 379 | 437
Deferred tax assets, gross | 51,386 | 50,619
Deferred tax liabilities: |  |
Fixed assets | (528) | (492)
Intangibles and goodwill |  | (84)
Deferred tax assets, net | 50,858 | 50,043
Valuation allowance | (23,134) | (22,997)
Deferred tax assets (liabilities), net of allowance | 27,724 | 27,046
Less current portion | 2,271 | 1,258
Deferred tax assets (liabilities), non-current | $ 25,453 | $ 25,788

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