Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The reconciliation of income tax computed at the federal statutory tax rate to the benefit for income taxes from continuing operations is as follows (in thousands):
 
Years ended December 31,
 
2014
 
2013
 
2012
Tax at statutory rate
$
(7,713
)
 
$
(38,821
)
 
$
(41,291
)
State taxes, net of federal benefit
(375
)
 
(6,399
)
 
(4,868
)
Change in valuation allowance
(640
)
 
216,586

 
668

Federal and state net operating losses, (addition) removal of limitations
(2,882
)
 
(173,288
)
 
42,121

Share-based compensation
4,366

 
2,761

 
2,597

Credits and other
(432
)
 
(2,192
)
 
89

Income tax benefit
$
(7,676
)
 
$
(1,353
)
 
$
(684
)
Schedule of Components of Income Tax Expense (Benefit)
Income tax benefit from continuing operations consists of the following (in thousands):
 
Years ended December 31,
 
2014
 
2013
 
2012
Current:
 
 
 
 
 
Federal
$
(7,713
)
 
$
(1,491
)
 
$
(629
)
State
(279
)
 
(200
)
 
2

Foreign
69

 
(79
)
 
21

Total current tax benefit provision
(7,923
)
 
(1,770
)
 
(606
)
Deferred:
 
 
 
 
 
Federal
203

 
335

 
(71
)
State
44

 
82

 
(7
)
Total deferred tax provision (benefit)
247

 
417

 
(78
)
Income tax benefit
$
(7,676
)
 
$
(1,353
)
 
$
(684
)
Schedule of Deferred Tax Assets and Liabilities
A full valuation allowance has been recorded, as realization of such assets is uncertain (in thousands):
 
As of December 31,
 
2014
 
2013
Deferred tax assets:
 
 
 
Net operating loss carryforwards
$
189,140

 
$
195,634

Capitalized research expenses and credits
21,555

 
21,874

Depreciation
3,169

 
2,870

Stock options
8,745

 
9,033

Accruals and reserves
4,400

 
6,248

Deferred revenue and other, net
8,797

 
815

Total deferred tax assets
235,806

 
236,474

Valuation allowance
(235,773
)
 
(236,413
)
Deferred tax assets
33

 
61

Deferred tax liabilities
(616
)
 
(399
)
Net deferred tax liabilities
$
(583
)
 
$
(338
)
Schedule of Unrecognized Tax Benefits Roll Forward
Following is a tabular reconciliation of unrecognized tax benefit activity for the three years ended December 31, 2014 (excluding interest and penalties) (in thousands):
Beginning balance, January 1, 2012
$
2,533

Reduction due to tax provision that reversed in the current year
(2,533
)
Ending balance, December 31, 2012
—

Additions based on tax positions related to the current year
997

Additions based on tax positions related to prior years
4,522

Ending balance, December 31, 2013
5,519

Additions based on tax positions related to the current year
1,748

Additions based on tax positions related to prior years
(22
)
Ending balance, December 31, 2014
$
7,245