REVENUE - Contract Liability (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 1,629	$ 1,629	$ 1,649	$ 1,681
Revenue recognized in the period from amounts included in deferred revenue at the beginning of the period	$ 209	$ 360