DEBT - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Total interest expense	$ 2,863	$ 2,361	$ 8,261	$ 8,407
Line of Credit | Silicon Valley Bank Term Loan | Term loan
Debt Instrument [Line Items]
Simple and contractual interest	431	100	1,115	280
Amortization of prepaid fees for line of credit	257	80	688	242
Amortization of debt discount	0	14	29	99
Total interest expense	688	194	1,832	621
Convertible Senior Notes
Debt Instrument [Line Items]
Simple and contractual interest	835	835	2,505	2,723
Amortization of prepaid fees for line of credit	76	69	223	257
Amortization of debt discount	1,257	1,141	3,682	4,432
Total interest expense	2,168	2,045	6,410	7,412
Other Debt [Member]
Debt Instrument [Line Items]
Simple and contractual interest	7	122	19	374
Total interest expense	$ 7	$ 122	$ 19	$ 374