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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Assumptions Used to Estimate Fair Value of Options

The Company used the following assumptions:

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

Dividend yield

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Expected volatility

 

 

48.0

%

 

 

51.3

%

 

 

50.4

%

 

 

51.3

%

Risk-free interest rate

 

 

1.58

%

 

 

1.92

%

 

 

1.73

%

 

 

1.92

%

Expected life of options (in years)

 

 

6.25

 

 

 

6.25

 

 

 

6.25

 

 

 

6.25

 

Forfeiture rate

 

 

7.0

%

 

 

7.0

%

 

 

7.0

%

 

 

7.0

%