INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred income tax assets:
Net operating loss carryforward	$ 26,985	$ 21,651
Intangible assets	4,971	5,182
Stock-based compensation	2,001	4,592
Start-up and organizational expenses	176	203
Accrued expenses and other	143	47
Total deferred income tax assets	34,276	31,675
Valuation allowance for deferred income tax assets	(34,276)	(31,674)
Net deferred income tax assets	0	1
Deferred tax liabilities
Deferred income tax liability- property, equipment and other	0	(1)
Net deferred income tax assets	$ 0	$ 0