INCOME TAXES - Summary of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
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