REVENUE - Contract Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019
Contract Receivables
Royalty payments monthly due period	30 days
Royalty receivables	$ 26,635	$ 20,733
Minimum
Contract Receivables
Royalty payments quarterly due period	30 days
Maximum
Contract Receivables
Royalty payments quarterly due period	60 days