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Stock-Based Compensation Expense (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Assumptions Used to Estimate Fair Value of Options

The Company used the following assumptions:

 

 

 

Years Ended December 31,

 

 

 

2016

 

 

2015

 

 

2014

 

Dividend yield

 

 

—

 

 

 

—

 

 

 

—

 

Expected volatility

 

 

47.5

%

 

 

49.1

%

 

 

51.3

%

Risk-free interest rate

 

 

1.38

%

 

 

1.75

%

 

 

1.89

%

Expected life of options (in years)

 

 

6.25

 

 

 

6.25

 

 

 

6.25

 

Forfeiture rate

 

 

7.0

%

 

 

7.0

%

 

 

7.0

%

Weighted-average grant-date fair value

 

$

1.26

 

 

$

2.88

 

 

$

4.77

 

Weighted-average grant-date exercise price

 

$

2.66

 

 

$

5.85

 

 

$

9.39