INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Stock-based compensation	$ 85	$ 211
Research and development credits	717	490
Inventory	68	98
Professional fees	193	175
Deferred tax assets related to other items	251	140
Net operating loss carryforwards	142	1,016
Total deferred tax assets	1,456	2,130
Deferred tax liabilities related to depreciable and amortizable assets	(1,278)	(836)
Deferred tax liabilities related to other items	(21)	(42)
Net deferred tax asset	$ 157	$ 1,252