Collaborative and Other Licensing Arrangements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017
Novimmune SA
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront license payment	$ 5.0
Potential milestone payment	$ 335.0
Parion Sciences
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront license payment		$ 20.0
Potential milestone payment		$ 515.0