INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Stock-based compensation	$ 283	$ 398
AMT and research and development credits	668	523
Deferred rent	58	77
Inventory	147	211
Professional fees	91	155
Accrued vacation	31	43
Accounts receivable allowance	26	49
Contribution carryovers	13	12
Net operating loss carryforwards	1,153	1,443
Total deferred tax assets	2,470	2,911
Deferred tax liabilities related to depreciable and amortizable assets	(587)	(783)
Net deferred tax assets before valuation allowance	1,883	2,128
Valuation allowance	(1,875)	(2,128)
Net deferred tax assets	$ 8	$ 0