LEASES - Lease balance sheet (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2020 USD ($)
LEASES
Right-of-use assets - current	$ 829
Operating Lease, Right-of-Use Asset, Current, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseRightOfUseAssetCurrent
Right-of-use assets - non-current	$ 6,878
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseRightOfUseAssetNoncurrent
Total right-of-use assets	$ 7,707
Lease liabilities - current	$ 918
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Lease liabilities - current
Lease liabilities - non-current	$ 8,118
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Lease liabilities - non-current
Total operating lease liabilities	$ 9,036