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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]  
Components of Federal and State Income Tax Expense (Benefit)
The components of federal and state income tax expense (benefit) are as follows (in thousands):
 
 
 
As of December 31,
 
 
2013
 
2012
Current
 
 
 
 
Federal
 
$

 
$

State
 

 

Total current
 

 

Deferred expense (benefit)
 
 
 
 
Federal
 
894

 
(894
)
State
 
158

 
(158
)
Total deferred
 
1,052

 
(1,052
)
Total income tax expense (benefit)
 
$
1,052

 
$
(1,052
)
Components of Net Deferred Tax Assets
The components of net deferred tax assets are as follows (in thousands):
 
 
 
As of December 31,
 
 
2013
 
2012
Net operating loss carryforwards
 
$
33,539

 
$
23,632

Tax credit carryforwards
 
3,549

 
3,201

Unrealized gain on marketable securities
 

 
(1,052
)
Stock based compensation
 
8,322

 
7,944

Other
 
12

 
(328
)
Licensing deduction deferral
 
8,682

 
8,194

Gross deferred tax assets
 
54,104

 
41,591

Valuation allowance
 
(54,104
)
 
(41,591
)
Net deferred tax asset
 
$

 
$

Components of Net Deferred Tax Liabilities
The components of net deferred tax liabilities are as follows (in thousands):
 
 
 
As of December 31,
 
 
2013
 
2012
In-process research and development not subject to future amortization for tax purposes
 
$
5,053

 
$
5,053

Gross deferred tax liability
 
$
5,053

 
$
5,053

Schedule of Provision Computed by Applying Federal Statutory Rate
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):
 
 
 
As of December 31,
 
 
2013
 
2012
Expected federal income tax benefit
 
$
(25,713
)
 
$
(11,688
)
State income taxes after credits
 
(3,676
)
 
(1,067
)
Unrealized gain on marketable securities
 
1,052

 
(1,052
)
Changes in warrant value
 
17,283

 
3,664

Stock compensation
 
813

 
152

Effect of change in valuation allowance
 
11,408

 
8,939

Income tax credits
 
(240
)
 

Other
 
125

 

 
 
$
1,052

 
$
(1,052
)