Basic and Diluted Net Income (Loss) Per Share (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
Numerator:
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)
Denominator:
Weighted average common shares-basic	69,081,000		68,848,000		68,658,000	68,323,000					68,728,000	59,973,000	48,344,000
Effect of dilutive securities:
Weighted average common shares - diluted	69,081,000		68,848,000		71,725,000	68,323,000					72,617,000	59,973,000	48,344,000
Net income (loss) per share:
Basic	$ (0.24)	[1]	$ (0.19)	[1]	$ 0.82	$ (0.21)					$ 0.17	$ (0.59)	$ (0.31)
Diluted	$ (0.24)	[1]	$ (0.19)	[1]	$ 0.78	$ (0.21)					$ 0.17	$ (0.59)	$ (0.31)
Potentially dilutive securities excluded from net income (loss) per share - diluted because their effect is anti-dilutive											441,000	6,858,000	8,395,000
Employee stock options
Effect of dilutive securities:
Employee stock options and purchase plan											3,781,000
Employee Stock Purchase Plan
Effect of dilutive securities:
Employee stock options and purchase plan											108,000

[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.