Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (8.7)	$ (19.1)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	0.8	0.9
Non-cash interest expense related to sale of future royalties	0.8	0.9
Non-cash royalty revenue related to sale of future royalties, net of withholding tax	(2.7)	(2.3)
Change in operating assets and liabilities:
Accounts receivables	0.3	(1.4)
Prepaid expenses and other current assets	0.2	(0.1)
Accounts payable and accrued expenses	0.1	1.4
Net cash used in operating activities	(9.2)	(19.7)
Cash flows from investing activities:
Purchases of short and long-term investments	(7.0)	(8.4)
Maturity of short-term investments	27.9	16.6
Net cash provided by investing activities	20.9	8.2
Cash flows from financing activities:
Payment on note payable		(0.1)
Net used in financing activities		(0.1)
Increase (decrease) in cash and cash equivalents	11.7	(11.6)
Cash and cash equivalents at beginning of period	17.7	49.7
Cash and cash equivalents at end of period	$ 29.4	$ 38.1