STOCK BASED COMPENSATION PLANS - Summary of Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Number of Options
Outstanding options, beginning of period (in shares)	1,127,098	904,766	895,221
Granted (in shares)	2,075,760	470,000	179,047
Exercised (in shares)	(440,435)	(11,669)	(93,169)
Forfeited (in shares)	(324,998)	(235,999)	(76,333)
Expired (in shares)	0	0	0
Outstanding options, end of period (in shares)	2,437,425	1,127,098	904,766	895,221
Exercisable options, end of period (in shares)	560,871	638,988	632,737
Weighted Average Exercise Price
Outstanding options, beginning of period (in USD per share)	$ 4.84	$ 3.31	$ 2.79
Granted (in USD per share)	6.47	8.22	5.66
Exercised (in USD per share)	2.48	5.40	1.92
Forfeited (in USD per share)	6.55	5.70	4.30
Expired (in USD per share)	0	0	0
Outstanding options, end of period (in USD per share)	6.43	4.84	3.31	$ 2.79
Exercisable options, end of period (in USD per share)	$ 6.01	$ 2.86	$ 2.55
Weighted Average Remaining Contractual Term
Outstanding options	6 years 2 months 12 days	4 years 3 months 18 days	4 years 3 months 18 days	5 years 2 months 12 days
Exercisable options, end of period	4 years 9 months 18 days	3 years 4 months 24 days	3 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding options, beginning balance	$ 2,917	$ 9,664	$ 2,160
Exercised	(595)	0
Outstanding options, ending balance	1,411	2,917	9,664	$ 2,160
Exercisable options, end of period	$ 559	$ 2,923	$ 7,242