Debt - Summary of Interest Expense on All Convertible Debt (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Debt Disclosure [Abstract]
Interest expense related to contractual interest coupon	$ 2,608	$ 2,255	$ 7,444	$ 7,125
Interest expense related to amortization of debt discount	862	661	2,589	2,117
Interest expense related to amortization of debt issuance costs	391	383	1,259	1,165
Total interest expense recognized	$ 3,861	$ 3,299	$ 11,292	$ 10,407