PRODUCT REVENUE - Schedule of Allowances for Sales (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2019 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of June 30, 2018	$ 0
Allowances for sales during prior periods	0
Allowances for sales during the current period	14,721
Credits/deductions issued for prior year sales	0
Credits/deductions issued for sales during the current period	(9,533)
Balance as of March 31, 2019	5,188
Returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of June 30, 2018	0
Allowances for sales during prior periods	0
Allowances for sales during the current period	129
Credits/deductions issued for prior year sales	0
Credits/deductions issued for sales during the current period	(26)
Balance as of March 31, 2019	103
Other
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of June 30, 2018	0
Allowances for sales during prior periods	0
Allowances for sales during the current period	14,592
Credits/deductions issued for prior year sales	0
Credits/deductions issued for sales during the current period	(9,507)
Balance as of March 31, 2019	$ 5,085