INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Stock-based compensation	$ 261	$ 283
AMT and research and development credits	517	668
Deferred rent	41	58
Inventory	158	147
Professional fees	124	91
Accrued vacation	27	31
Accounts receivable allowance	33	26
Contribution carryovers	8	13
Net operating loss carryforwards	1,067	1,153
Total deferred tax assets	2,236	2,470
Deferred tax liabilities related to depreciable and amortizable assets	(728)	(587)
Deferred tax liabilities related to other items	(63)	0
Net deferred tax assets before valuation allowance	1,445	1,883
Valuation allowance	(1,688)	(1,875)
Net deferred tax (liability) asset	$ (243)
Net deferred tax (liability) asset		$ 8