SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance Beginning of Year	$ 102	$ 78	$ 63
Charges to Expense	81	62	20
Write-offs /Recoveries	(51)	(38)	(5)
Balance End of Year	$ 132	$ 102	$ 78