Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

United States and Foreign Components of Consolidated Loss Before Income Taxes

U.S and foreign components of consolidated loss before income taxes for the years ended December 2015, 2014 and 2013, was as follows (in thousands):

	Year Ended December 31,
	2015			2014			2013
Loss before income taxes:
U.S.	$	(59,897	)	$	(38,928	)	$	(44,035	)
Foreign		358			368			916
Loss before income taxes	$	(59,539	)	$	(38,560	)	$	(43,119	)

Provision Benefit for Income Taxes

The provision for income taxes for the years ended December 2015, 2014 and 2013, was as follows (in thousands):

	Year Ended December 31,
	2015			2014		2013
Provision for income taxes:
Current:
Foreign	$	147		$	168	$	191
Federal		—			—		—
State		—			1		—
Total Current		147			169		191
Deferred:
Foreign		—			—		—
Federal		(3,750	)		22		21
State		(68	)		4		6
Total Deferred		(3,818	)		26		27
(Benefit) provision for income taxes	$	(3,671	)	$	195	$	218

Difference Between Provision for Income Taxes and Amounts Computed by Applying Federal Statutory Income Tax Rate to Loss before Taxes

The difference between the provision for income taxes and the amount computed by applying the federal statutory income tax rate to loss before taxes for the years ended December 31, 2015, 2014 and 2013, was as follows (in thousands):

	Year Ended December 31,
	2015			2014			2013
Federal statutory tax	$	(20,243	)	$	(13,110	)	$	(14,661	)
Warrants		(3,565	)		(3,367	)		4,926
Expiration of federal loss carryovers		3,337			—			—
Change in valuation allowance		11,754			16,576			9,955
Change in state apportionment		4,085			—			—
Other		961			96			(2	)
(Benefit) provision for income taxes	$	(3,671	)	$	195		$	218

Significant Components of Deferred Tax Assets and Liabilities

The significant components of the Company’s deferred tax assets and liabilities at December 31, 2015 and 2014, were as follows (in thousands):

	December 31,
	2015			2014
Deferred tax assets:
Net operating loss carryforwards	$	165,813		$	151,100
Research and development credit carryforwards		35,131			33,800
Capitalized research and development		17,916			15,500
Deferred compensation		5,908			5,800
Capital loss carryforwards		—			3,700
Other		3,911			3,200
Total deferred tax assets		228,679			213,100
Valuation allowance		(224,854	)		(213,100	)
Net deferred tax assets		3,825			—
Deferred tax liabilities:
Unrealized gain on investments		3,825			—
Amortization of goodwill		122			115
Total deferred tax liabilities	$	3,947		$	115