Schedule of Quarterly Results (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Schedule Of Quarterly Results Details
Total revenue	$ 2,123		$ 1,927		$ 77,903	$ 37	$ 1,386		$ 2,059		$ 2,824	$ 1,964	$ 81,990	$ 8,233	$ 9,307
Total operating expenses	19,605		19,889		16,020	14,598	12,381		11,341		10,349	9,536	70,112	43,607	24,919
Income (loss) from operations	(17,482)		(17,962)		61,883	(14,561)	(10,995)		(9,282)		(7,525)	(7,572)	11,878	(35,374)	(15,612)
Net income (loss)	$ (16,906)		$ (12,823)		$ 56,253	$ (14,538)	$ (10,964)		$ (9,217)		$ (7,499)	$ (7,523)	$ 11,986	$ (35,203)	$ (15,024)
Basic (per share)	$ (0.24)	[1]	$ (0.19)	[1]	$ 0.82	$ (0.21)							$ 0.17	$ (0.59)	$ (0.31)
Diluted (per share)	$ (0.24)	[1]	$ (0.19)	[1]	$ 0.78	$ (0.21)							$ 0.17	$ (0.59)	$ (0.31)
Basic and diluted (per share)							$ (0.18)	[1]	$ (0.15)	[1]	$ (0.13)	$ (0.13)
Basic (shares)	69,081,000		68,848,000		68,658,000	68,323,000							68,728,000	59,973,000	48,344,000
Diluted (shares)	69,081,000		68,848,000		71,725,000	68,323,000							72,617,000	59,973,000	48,344,000
Basic and diluted (shares)							60,968,000		59,931,000		59,715,000	59,278,000

[1] Basic and diluted net loss per share amounts are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted net income (loss) per share information may not equal annual basic and diluted net income (loss) per share.