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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
A summary of stock option activity for the nine months ended September 30, 2016 is as follows:
 
Shares Under Option
 
Weighted- Average Exercise Price
 
Weighted- Average Contractual Life
 
Aggregate Intrinsic Value
 
 
 
 
 
 
 
 
 
(in thousands)
 
 
 
 
 
(in thousands)
Outstanding at December 31, 2015
6,203

 
$
9.76

 
 
 
 
Granted
419

 
$
14.09

 
 
 
 
Exercised
(1,931
)
 
$
7.14

 
 
 
 
Canceled
(607
)
 
$
12.05

 
 
 
 
Outstanding at September 30, 2016
4,084

 
$
11.10

 
6.93 years
 
$
2,733

Vested and expected to vest
4,084

 
$
11.10

 
6.93 years
 
$
2,733

Exercisable at September 30, 2016
2,618

 
$
9.74

 
6.26 years
 
$
2,663
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The Company estimates the fair value of stock options that contain service and/or performance conditions using the Black-Scholes option pricing model. No stock options were granted during the third quarter of 2016. The weighted-average input assumptions used by the Company were as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
Expected term (in years)
0

 
6.0

 
5.9

 
4.3

Risk-free interest rate
—
%
 
1.74
%
 
1.43
%
 
1.26
%
Expected volatility
—
%
 
43
%
 
48
%
 
48
%
Dividend yield
—
%
 
—
%
 
—
%
 
—
%
Nonvested Restricted Stock Shares Activity
A summary of restricted stock activity for the nine months ended September 30, 2016 is as follows:
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Nonvested shares of restricted stock outstanding at December 31, 2015
1,479

 
$
15.58

Granted
525

 
$
12.15

Canceled
(457
)
 
$
14.42

Vested
(339
)
 
$
16.35

Nonvested shares subject to restricted stock outstanding at September 30, 2016
1,208

 
$
14.31
Schedule of Nonvested Restricted Stock Units Activity
A summary of restricted stock unit activity for the nine months ended September 30, 2016 is as follows:
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
 
(in thousands)
 
 
Nonvested shares of restricted stock units outstanding at December 31, 2015
2,647

 
$
15.76

Granted
2,080

 
$
13.20

Canceled
(815
)
 
$
14.80

Vested
(625
)
 
$
16.17

Nonvested shares subject to restricted stock units outstanding at September 30, 2016
3,287

 
$
14.28
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs for all Plans
Total stock-based compensation expense recorded in the consolidated statements of operations was as follows:  
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
 
 
 
 
 
 
 
 
 
(in thousands)
Cost of revenue
$
91

 
$
65

 
$
261

 
$
177

Sales and marketing
2,054

 
2,197

 
6,711

 
5,180

Technology and development
1,287

 
1,525

 
4,461

 
3,431

General and administrative
3,099

 
5,013

 
10,615

 
13,249

Total stock-based compensation expense
$
6,531

 
$
8,800

 
$
22,048

 
$
22,037