STOCK BASED COMPENSATION PLANS - Summary of Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Number of Options
Outstanding options, beginning of period (in shares)	904,766	895,221	610,141
Granted (in shares)	470,000	179,047	285,080
Exercised (in shares)	(11,669)	(93,169)	0
Forfeited (in shares)	(235,999)	(76,333)	0
Expired (in shares)	0	0	0
Outstanding options, end of period (in shares)	1,127,098	904,766	895,221	610,141
Exercisable options, end of period (in shares)	638,988	632,737	483,474
Weighted Average Exercise Price
Outstanding options, beginning of period (in USD per share)	$ 3.31	$ 2.79	$ 2.07
Granted (in USD per share)	8.22	5.66	4.30
Exercised (in USD per share)	5.40	1.92	0.00
Forfeited (in USD per share)	5.70	4.30	0.00
Expired (in USD per share)	0.00	0.00	0.00
Outstanding options, end of period (in USD per share)	4.84	3.31	2.79	$ 2.07
Exercisable options, end of period (in USD per share)	$ 2.86	$ 2.55	$ 2.08
Weighted Average Remaining Contractual Term
Outstanding options	4 years 3 months	4 years 3 months	5 years 2 months 15 days	5 years 5 months
Exercisable options, end of period	3 years 5 months	3 years 11 months	4 years 6 months
Aggregate Intrinsic Value
Outstanding options	$ 2,917	$ 9,664	$ 2,160	$ 1,342
Exercisable options, end of period	$ 2,923	$ 7,242	$ 1,511