Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Valuation Assumptions
The following table sets forth the significant assumptions used in the Black-Scholes option pricing model and the Monte Carlo simulations and the calculation of share-based compensation expense during 2015, 2014 and 2013:
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Expected dividend yield
 
—

 
—

 
—

Risk-free interest rate
 
1.5% to 2.0%
 
1.9% to 2.2%
 
0.9% to 2.1%
Expected volatility
 
50%
 
50%
 
50%
Expected term (in years)
 
6.25
 
6.25 to 7.50
 
5.82 to 8.82
Forfeitures
 
5.68% annually
 
5.68% annually
 
5.68% annually
Schedule of Share-based Compensation Expense
Total share-based compensation costs that have been included in the Company’s consolidated statements of operations were as follows (in thousands):
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
Share-Based Compensation Expense Allocation Details:
 
 
 
 
 
 
Cost of services
 
$
7,208

 
$
6,668

 
$
10,740

Selling, general and administrative
 
24,463

 
13,503

 
13,061

Restatement and other costs
 
—

 
8,761

 
1,224

Total share-based compensation expense (1)
 
$
31,671

 
$
28,932

 
$
25,025


(1) Includes $2.4 million and $1.8 million in share-based compensation expense paid in cash during the years ended December 31, 2015 and 2014, respectively.
Schedule of Stock Option Activity
The following table sets forth a summary of all employee and non-employee option activity under all plans and inducement grants for the years ended December 31, 2015, 2014 and 2013:
 
 
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2013
 
17,707,139

 
$
13.88

 
7.6
 
$
25,957

Granted
 
8,345,437

 
10.09

 
 
 
 
Exercised
 
(9,400
)
 
4.34

 
 
 
 
Canceled
 
(1,057,052
)
 
17.60

 
 
 
 
Forfeited
 
(4,445,851
)
 
15.64

 
 
 
 
Outstanding at December 31, 2013
 
20,540,273

 
11.77

 
7.4
 
15,673

Granted
 
4,406,856

 
8.78

 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Canceled
 
(1,494,219
)
 
13.41

 
 
 
 
Forfeited
 
(3,528,505
)
 
12.14

 
 
 
 
Outstanding at December 31, 2014
 
19,924,405

 
10.91

 
6.9
 
9,444

Granted
 
2,231,504

 
5.60

 
 
 
 
Exercised
 
(1,374,438
)
 
1.13

 
 
 
 
Canceled
 
(4,484,843
)
 
14.10

 
 
 
 
Forfeited
 
(1,036,362
)
 
8.47

 
 
 
 
Outstanding at December 31, 2015
 
15,260,266

 
10.23

 
7.0
 
261

Outstanding, vested and exercisable at December 31, 2013
 
9,605,505

 
$
11.89

 
5.9
 
$
15,096

Outstanding, vested and exercisable at December 31, 2014
 
11,879,209

 
$
11.73

 
5.6
 
$
9,444

Outstanding, vested and exercisable at December 31, 2015
 
8,876,517

 
$
11.63

 
6.1
 
$
108
Schedule of Restricted Stock Awards Activity
In the third quarter of 2011, the Company began to grant RSAs to its employees. A summary of the activity during the years ended December 31, 2015, 2014 and 2013 is shown below:
 
 
Shares
 
Weighted-
Average Grant
Date Fair Value
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
Outstanding and Unvested at January 1, 2013
 
160,220

 
$
21.23

 
9.0
Granted
 
508,303

 
11.46

 
 
Vested
 
(50,004
)
 
11.47

 
 
Forfeited
 
(160,220
)
 
21.23

 
 
Outstanding and Unvested at December 31, 2013
 
458,299

 
$
11.45

 
9.4
Granted
 
2,365,000

 
8.39

 
 
Vested
 
(127,084
)
 
11.46

 
 
Forfeited
 
(218,750
)
 
9.40

 
 
Outstanding and Unvested at December 31, 2014
 
2,477,465

 
$
8.71

 
9.3
Granted
 
8,994,729

 
3.34

 
 
Vested
 
(1,892,049
)
 
5.24

 
 
Forfeited
 
(324,213
)
 
7.61

 
 
Outstanding and Unvested at December 31, 2015
 
9,255,932

 
$
4.24

 
9.4