LEASES - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Assets:
Operating lease right-of-use assets	$ 4,570	$ 5,603
Liabilities:
Operating lease liabilities, accrued expenses	$ 1,139	$ 1,075
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Operating lease liabilities, non-current	$ 3,947	$ 4,749
Total lease liabilities	$ 5,086	$ 5,824