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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense Related to Employee Stock Options
The following table summarizes stock-based compensation expense related to employee stock options under ASC 718-10 included in Company’s statements of operations for the periods presented (amounts in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Cost of revenue
$
484

 
$
501

 
$
844

 
$
922

Sales and marketing expense
923

 
569

 
1,737

 
1,315

Product development expense
931

 
812

 
1,611

 
1,681

General and administrative expense
869

 
1,019

 
1,712

 
2,034

Total stock based compensation included in costs and expenses
$
3,207

 
$
2,901

 
$
5,904

 
$
5,952

Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model
The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
Dividend yield
0.0%
 
0.0%
 
0.0%
 
0.0%
Risk-free interest rate
1.6% - 1.7%
 
0.7% - 1.0%
 
1.5% - 1.7%
 
0.7% - 1.0%
Expected life (in years)
5
 
5
 
5
 
5
Historical volatility
52.6% - 53.2%
 
56.7% - 60.1%
 
52.6% - 53.7%
 
56.7% - 60.1%
Summary of Stock Option Activity and Weighted Average Exercise Prices
A summary of the Company’s stock option activity and weighted average exercise prices follows:
 
Options
 
Weighted
Average
Exercise Price
Options outstanding at December 31, 2013
9,724,193

 
$
10.86

Options granted
2,833,500

 
10.72

Options exercised
(286,553
)
 
8.40

Options cancelled
(836,916
)
 
13.27

Options outstanding at June 30, 2014
11,434,224

 
10.71

Options exercisable at June 30, 2014
4,512,864

 
$
9.15

Summary of Status of Nonvested Shares
A summary of the status of the Company’s nonvested shares as of December 31, 2013, and changes during the six months ended June 30, 2014 is as follows:
 
Options
 
Weighted
Average Grant-
Date Fair Value
Nonvested Shares at December 31, 2013
5,633,701

 
$
6.90

Granted
2,833,500

 
5.06

Vested
(708,925
)
 
5.79

Cancelled
(836,916
)
 
6.73

Nonvested Shares at June 30, 2014
6,921,360

 
$
5.80