Nature of Business and Plan of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Nature of Business and Plan of Operations
Net loss	$ (30,474)	$ (21,618)	$ 13,635	$ (22,282)	$ (26,499)	$ (37,452)	$ 3,813	$ (11,226)	$ (60,739)	$ (71,364)	$ (72,811)
Accumulated deficit	(708,870)				(648,131)				(708,870)	(648,131)
Product Revenue									0	0	0
Cash and cash equivalents	$ 278,109				$ 142,261				$ 278,109	$ 142,261	$ 194,960	$ 160,938