Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Significant components of deferred tax assets

Significant components of the Company’s deferred tax assets as of December 31, 2013 and 2012 are listed below (in thousands):

	December 31,
	2013			2012
Deferred tax assets:
Capitalized research and development and other	$	28,283		$	21,193
Valuation allowance for deferred tax assets	(28,283		)	(21,193		)
Net deferred taxes	$	—		$	—

Provision for income taxes

Income taxes computed by applying the U.S. Federal Statutory rates to income from continuing operations before income taxes are reconciled to the provision for income taxes set forth in the statement of operations as follows (in thousands):

	December 31,
	2013			2012
Income tax benefit at statutory federal rate	$	(6,098	)	$	(2,708	)
State tax expense (benefit), net of federal	—			(445		)
Research and development credits	126			—
Fair Value of Derivative	—			(1,221		)
Expired tax attributes	—			3,008
Removal of net operating losses and research and development credits	—			(2,522		)
Change in valuation allowance	5,972			10,037
Other	—			(6,149		)
Provision for income taxes	$	—		$	—