REVENUE - Contract Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Increase (Decrease) In Contract with Customer, Liability [Roll Forward]
Deferred revenue, beginning of the period		$ 511
Deferred revenue, end of the period	$ 1,322	1,322
Revenue recognized in the period from amounts included in deferred revenue at the beginning of the period	49	271
Calculated under Revenue Guidance in Effect before Topic 606
Increase (Decrease) In Contract with Customer, Liability [Roll Forward]
Deferred revenue, beginning of the period	$ 1,437	$ 511