COMMITMENTS AND CONTINGENCIES - Other Leases - Additional Information (Details) $ in Thousands				1 Months Ended	12 Months Ended
	Dec. 01, 2016 USD ($) ft²	Oct. 17, 2016 ft²	Aug. 07, 2016 USD ($) ft²	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) ft²	Jun. 30, 2015 USD ($)
Area of new premises (in square feet) | ft²		5,362
Monthly base rent | $					$ 729	$ 479	$ 354
Third Amendment to Office Space Lease [Member]
Area of current premises (in square feet) | ft²	17,249
Area of new premises (in square feet) | ft²	17,689
Lease term (in years)	7 years
Monthly base rent | $	$ 38
Lease renewal term (in years)	5 years
Fourth Amendment to Office Space Lease [Member]
Area of current premises (in square feet) | ft²				1,097		1,097
Monthly base rent | $				$ 1,120
Fifth Amendment to Office Space Lease [Member]
Area of new premises (in square feet) | ft²			23,138
Monthly base rent | $			$ 47
Maximum monthly base rent | $			$ 53