Income Taxes (Details) (USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
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	$ (71,364,000)	$ (72,811,000)	$ (73,319,000)
Expected tax benefit at 34%	(24,264,000)	(24,756,000)	(24,928,000)
Permanent differences	1,953,000	1,540,000	1,470,000
State tax benefit net of federal benefit	(4,062,000)	(3,921,000)	(4,204,000)
Increase in valuation allowance, net	26,011,000	25,624,000	25,274,000
Federal research credit	(1,002,000)	(2,260,000)	(603,000)
Expired loss and credit carryforwards	1,364,000	3,773,000	2,991,000
Federal
Net operating loss carryforwards
Operating loss carryforward	388,800,000
Operating loss carryforward related to deductions from the exercise of stock options	24,600,000
State
Net operating loss carryforwards
Operating loss carryforward	227,900,000
Operating loss carryforward related to deductions from the exercise of stock options	$ 21,200,000