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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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
 
March 31,
 
2014
 
2013
Cost of revenue
$
360

 
$
420

Sales and marketing expense
814

 
746

Product development expense
680

 
870

General and administrative expense
843

 
1,015

Total stock based compensation included in costs and expenses
$
2,697

 
$
3,051

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
 
March 31,
 
2014
 
2013
Dividend yield
0.0%
 
0.0%
Risk-free interest rate
1.5%
 
0.9%
Expected life (in years)
5
 
5
Historical volatility
53.7%
 
58.7%
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
563,500

 
13.22

Options exercised
(222,083
)
 
9.17

Options cancelled
(387,028
)
 
14.25

Options outstanding at March 31, 2014
9,678,582

 
10.90

Options exercisable at March 31, 2014
4,205,765

 
$
8.94

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 three months ended March 31, 2014 is as follows:
 
Options
 
Weighted
Average Grant-
Date Fair Value
Nonvested Shares at December 31, 2013
5,633,701

 
$
6.90

Granted
563,500

 
6.25

Vested
(337,356
)
 
5.83

Cancelled
(387,028
)
 
7.23

Nonvested Shares at March 31, 2014
5,472,817

 
$
6.28