LEASES - Operating lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Lease Cost [Line Items]
Operating lease cost	$ 379	$ 270
Research and Development Expense
Lease Cost [Line Items]
Operating lease cost	268	188
General and Administrative Expense
Lease Cost [Line Items]
Operating lease cost	$ 111	$ 82