Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Summary of Deferred Tax Assets

Deferred tax assets consisted of the following as of December 31:	2013			2012
Net operating loss carryforward	$	22,952,000		$	31,338,000
Capitalized research and development expenses		6,055,000			10,402,000
License fees		277,000			325,000
Stock-based compensation expense		2,264,000			2,264,000
Other		547,000			737,000
Gross deferred tax assets		32,095,000			45,066,000
Valuation allowance		(32,095,000	)		(45,066,000	)
Net deferred tax assets	$	—		$	—

Summary of Reported Tax Benefit and Amount Computed Using U.S. Federal Statutory Rate

A reconciliation of the amount of reported tax benefit and the amount computed using the U.S. federal statutory rate of 35% for the years ended December 31 is as follows:

	2013			2012
Tax provision (benefit) at statutory rate	$	(321,000	)	$	(1,009,000	)
State taxes, net of federal benefit		985,000			267,000
Expiring state net operating loss carryforward		—			455,000
Gain on forgiven interest and cancellation of debt and other		2,567,000			2,567,000
Decrease in valuation allowance		(6,731,000	)		(5,080,000	)
Permanent items		6,069,000			2,800,000
	$	—		$	—

Summary of Income Tax Benefit

Income tax benefit for the years ended December 31:	2013			2012
Federal	$	3,574,000		$	(2,737,000	)
State		817,000			(645,000	)
		4,391,000			(3,382,000	)
Valuation allowance		(4,391,000	)		3,382,000
	$	—		$	—

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the unrecognized tax benefits recorded for the years ended December 31 is as follows:

	2013		2012
Balance at January 1	$	2,822,531	$	2,822,531
Additions based on tax positions related to the current year		—		—
Balance at December 31	$	2,822,531	$	2,822,531