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Share-Based Payments (Tables)
 12 Months Ended
Dec. 31, 2014
Shareholders' Equity and Share-based Payments [Abstract]  
Share-based Compensation - Black-Scholes assumptions
In applying the Black-Scholes methodology to the options granted, the Company used the following assumptions:
 
Year ended December 31,
 
2014
 
2013
Risk-free interest rate, average
2.2%
 
1.8%
Expected option life, average
8.2 years
 
6.8 years
Expected price volatility, average
47.6%
 
49.8%
Expected dividend yield
—%
 
—%
Schedule of Share-based Compensation, Stock Options, Activity
The following table shows the stock option activity:
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value
As of December 31, 2013
1,111,274

 
$
5.15

 
 
 
 
Granted
193,500

 
8.83

 
 
 
 
Expired and canceled
(29,532
)
 
6.87

 
 
 
 
Forfeited prior to vesting
(729
)
 
8.88

 
 
 
 
Exercised
(234,432
)
 
5.72

 
 
 
 
As of December 31, 2014
1,040,081

 
$
5.65

 
5.60
 
$
4,286

Vested and Expected to Vest at December 31, 2014
1,040,081

 
$
5.65

 
5.60
 
$
4,286

Vested at December 31, 2014
730,016

 
$
4.67

 
4.15
 
$
3,721