Nature of Business and Plan of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			384 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013	Jun. 30, 2010
Nature of Business and Plan of Operations
Net loss	$ (21,875)	$ (1,351)	$ (24,393)	$ (25,192)	$ (22,414)	$ (18,669)	$ (12,753)	$ (19,483)	$ (72,811)	$ (73,319)	$ (58,274)
Accumulated deficit	(576,767)				(503,956)				(576,767)	(503,956)		(576,767)
Product Revenue												0
Cash and cash equivalents	$ 194,960				$ 160,938				$ 194,960	$ 160,938	$ 191,206	$ 194,960	$ 109,156