Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Taxes [Abstract]

Deferred Tax Assets and Liabilities

The components of the Company’s deferred tax assets and liabilities, all of which are long-term, are as follows (in thousands):

	December 31,
	2013			2012
Deferred tax assets:
Net operating loss carryforwards	$	69,989		$	60,184
Tax credit carryforwards		18,816			15,514
Equipment, furnishings and other		11,313			9,822
Total deferred tax assets		100,118			85,520
Deferred tax liabilities		(92	)		(100	)
Net deferred tax assets		100,026			85,420
Valuation allowance		(100,026	)		(85,420	)
	$	—		$	—

Effective Income Tax Rate Reconciliation

The provision for income taxes differs from the provision computed by applying the Federal statutory rate to net loss before income taxes as follows (in thousands):

	Years ended December 31,
	2013			2012			2011
Federal benefit at statutory rate	$	(16,145	)	$	(6,107	)	$	(4,996	)
State income taxes, net of Federal taxes		(1,517	)		(745	)		(857	)
State credits		(787	)		(1,555	)
Warrant liabilities		6,871			941
Other permanent differences		14			(23	)		6
Provision related to change in valuation allowance		14,606			14,069			16,235
Other, net		(3,040	)		(6,578	)		(10,290	)
	$	2		$	2		$	98