Income Taxes (Tables)

12 Months Ended

Jun. 30, 2012

Income Taxes

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

	Year Ended June 30,
	2012			2011			2010
Loss before income tax expense	$	(73,319	)	$	(58,274	)	$	(51,177	)
Expected tax benefit at 34%	$	(24,928	)	$	(19,813	)	$	(17,400	)
Permanent differences		1,469			—			—
State tax benefit net of federal benefit		(4,204	)		(1,815	)		(2,002	)
Increase in valuation allowance, net		26,574			16,410			11,991
Expired loss and credit carryforwards		1,089			5,610			6,858
Other		—			(392	)		288
Benefit for income taxes	$	—		$	—		$	(265	)

Schedule of significant components of deferred tax assets

	June 30,
	2012			2011
Net operating loss carryforwards	$	98,601		$	82,533
Research and development tax credit carryforwards		10,393			9,590
Property and other intangible assets		1,486			807
Deferred revenue		28,325			21,168
Stock-based compensation		3,302			2,308
Deferred lease incentive		5,100			3,363
Other liabilities		512			2,676
Total deferred tax assets	$	147,719		$	122,445
Valuation allowance		(147,719	)		(122,445	)
Net deferred tax assets	$	—		$	—