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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table provides the assumptions utilized in the Black-Scholes model for options granted on September 24, 2014 and December 2, 2014. No options were granted during the six months ended June 30, 2015 and 2014.

 

     December 2, 2014     September 24, 2014  

Weighted-average risk-free interest rate

     51     42

Expected term of option in years

     1.6        1.7   

Weighted-average volatility

     35.56     36.47

Dividend yield

     0     0

Weighted average grant date fair value per share

   $ 3.19      $ 2.70   

Summary of Information Related to Stock Option

A summary of information related to stock options outstanding at June 30, 2015 is as follows:

 

     Shares      Weighted-Average Grant
Date Fair Value
     Shares Available for
Grant
 

Balance at December 31, 2014

     1,685,923       $ 3.09         1,295,814   

Granted

     —           

Exercised

     (170,000    $ 15.74      
  

 

 

       

 

 

 

Balance at June 30, 2015

     1,515,923       $ 2.91         1,295,814   
  

 

 

       

 

 

 

Vested and exercisable as of June 30, 2015

     1,500,282       $ 2.91