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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]  
Income (Loss) Before Income Tax Provision
(Loss) income from continuing operations before income taxes consists of the following (in thousands):
 
Year ended December 31,
 
2013
 
2012
 
2011
United States
$
(31,521
)
 
$
(27,068
)
 
$
(14,164
)
International
8,369

 
9,373

 
15,531

(Loss) income from continuing operations before income taxes
$
(23,152
)
 
$
(17,695
)
 
$
1,367
Provision for Income Taxes
The components of the benefit from income taxes consist of the following (in thousands):
 
Year ended December 31,
 
2013
 
2012
 
2011
Current:
 
 
 
 
 
Federal
$
(38,243
)
 
$
857

 
$
(95
)
State
93

 
212

 
529

International
1,988

 
1,193

 
1,222

Deferred:
 
 
 
 
 
Federal
(10,543
)
 
(2,053
)
 
(3,618
)
State
3,023

 
(1,362
)
 
(392
)
International
(1,059
)
 
(353
)
 
1,703

Total benefit from income taxes
$
(44,741
)
 
$
(1,506
)
 
$
(651
)
Reconciliation of Provision for Income Taxes
The differences between the (benefit from) provision for income taxes computed at the U.S. federal statutory rate at 35% and the Company’s actual (benefit from) provision for income taxes are as follows (in thousands):
 
Year ended December 31,
 
2013
 
2012
 
2011
(Benefit from) provision for income taxes at U.S. Federal statutory rate
$
(8,103
)
 
$
(6,193
)
 
$
478

State taxes
2,940

 
(824
)
 
(1,034
)
Differential in rates on foreign earnings
(1,396
)
 
(4,880
)
 
(9,565
)
Losses for which no benefit is taken
4,311

 
7,279

 
9,185

Change in valuation allowance
(996
)
 
(1,104
)
 
1,822

Change in liabilities for uncertain tax positions
(35,742
)
 
1,495

 
(1,666
)
Non-deductible stock-based compensation
981

 
1,974

 
1,854

Research and development tax credits
(5,044
)
 
—

 
(2,006
)
Non-deductible meals and entertainment
346

 
208

 
213

Adjustments related to tax positions taken during prior years
(1,154
)
 
619

 
(255
)
Tax-exempt investment income
(304
)
 
(248
)
 
(71
)
Other
(580
)
 
168

 
394

Total (benefit from) provision for income taxes
$
(44,741
)
 
$
(1,506
)
 
$
(651
)
Components of Deferred Tax Assets and Liabilities
The components of net deferred tax assets included in the Consolidated Balance Sheets are as follows (in thousands):
 
December 31,
 
2013
 
2012
Deferred tax assets:
 
 
 
Reserves and accruals
$
29,235

 
$
31,999

Net operating loss carryovers
27,253

 
27,522

Research and development credit carryovers
18,391

 
13,704

Deferred stock-based compensation
7,554

 
7,684

Other tax credits
2,738

 
2,207

  Gross deferred tax assets
85,171

 
83,116

Valuation allowance
(38,644
)
 
(34,347
)
  Gross deferred tax assets after valuation allowance
46,527

 
48,769

Deferred tax liabilities:
 
 
 
Depreciation and amortization
(3,590
)
 
(5,485
)
Intangibles
(6,227
)
 
(11,656
)
Other
(738
)
 
(483
)
  Gross deferred tax liabilities
(10,555
)
 
(17,624
)
  Net deferred tax assets
$
35,972

 
$
31,145
Activities Related to Valuation Allowance
 
Year ended December 31,
 
2013
 
2012
 
2011
Balance at beginning of period
$
34,347

 
$
28,354

 
$
26,557

Additions
6,364

 
5,993

 
1,797

Deductions
(2,067
)
 
—

 
—

Balance at end of period
$
38,644

 
$
34,347

 
$
28,354
Activities Related to Gross Unrecognized Tax Benefits
The following table summarizes the activity related to the Company’s gross unrecognized tax benefits (in millions):
 
Year ended December 31,
 
2013
 
2012
 
2011
Balance at beginning of period
52.1

 
52.5

 
48.4

Increase in balance related to tax positions taken during current year
5.4

 
0.6

 
6.6

Decrease in balance as a result of a lapse of the applicable statues of limitations
(1.3
)
 
(0.9
)
 
(2.1
)
Decrease in balance due to settlement with tax authorities
(32.1
)
 
—

 
—

Increase in balance related to tax positions taken during prior years
0.1

 
—

 
—

Decrease in balance related to tax positions taken during prior years
—

 
(0.1
)
 
(0.4
)
Balance at end of period
24.2

 
52.1

 
52.5