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DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018	Dec. 01, 2017
Debt Instrument [Line Items]
Notes payable at fair value	$ 0	$ 15,899
Long-term debt, gross	179,560	142,260
Long-term debt, net	134,245	95,876
Less: Current portion	0	(2,500)
Long-term debt, non-current portion	134,245	93,376
Convertible Senior Notes \| 2024 convertible senior notes
Debt Instrument [Line Items]
Long-term debt, gross	126,060
Long-term debt, net			$ 80,400
Line of Credit \| Term loan \| SVB credit facility \| Silicon Valley Bank
Debt Instrument [Line Items]
Exit fee due upon redemption	3,500	1,200
Carrying Value
Debt Instrument [Line Items]
Less: Unamortized debt discount and fees	(45,315)	(46,384)
Carrying Value \| Convertible Senior Notes \| 2024 convertible senior notes
Debt Instrument [Line Items]
Long-term debt, gross		126,060
Carrying Value \| Line of Credit \| Term loan \| SVB credit facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 53,500	$ 16,200