Income Taxes (Details) (USD $)	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
Reconciliation of the Company's expected tax benefit, as computed by applying the U.S. federal corporate tax rate to loss before the benefit for income taxes, and actual tax
U.S. federal corporate tax rate (as a percent)									34.00%	34.00%	34.00%
Loss before income tax expense	$ (22,414,000)	$ (18,669,000)	$ (12,753,000)	$ (19,483,000)	$ (16,150,000)	$ (15,003,000)	$ (14,233,000)	$ (12,888,000)	$ (73,319,000)	$ (58,274,000)	$ (51,177,000)
Expected tax benefit at 34%									(24,928,000)	(19,813,000)	(17,400,000)
Permanent differences									1,469,000
State tax benefit net of federal benefit									(4,204,000)	(1,815,000)	(2,002,000)
Increase in valuation allowance, net									26,574,000	16,410,000	11,991,000
Expired loss and credit carryforwards									1,089,000	5,610,000	6,858,000
Other										(392,000)	288,000
Benefit for income taxes											(265,000)
Federal
Net operating loss carryforwards
Operating loss carryforward	265,700,000								265,700,000
Operating loss carryforward related to deductions from the exercise of stock options	14,300,000								14,300,000
State
Net operating loss carryforwards
Operating loss carryforward	156,400,000								156,400,000
Operating loss carryforward related to deductions from the exercise of stock options	$ 13,000,000								$ 13,000,000