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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Option Activity
A summary of option activity under our 1998 Stock Option Plan as of December 31, 2016, and changes during the nine months ended September 30, 2017 is presented below.

 
Number
 of
Stock Options
 
Weighted Average
Exercise
 Price
 
Weighted
Average
Remaining
Contractual Life (years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding, December 31, 2016
350,186

 
$
19.45

 
4.25
 
$
4,453

Granted
32,750

 
28.15

 

 


Exercised
(25,580
)
 
20.19

 

 
271

Outstanding, September 30, 2017
357,356

 
$
20.19

 
4.18
 
$
3,050

Exercisable, September 30, 2017
307,108

 
$
19.19

 
3.44
 
$
2,946
Summary of Stock Options Outstanding
The following table summarizes information about our stock options outstanding at September 30, 2017:

 
Range of Exercise Prices
Options Outstanding
 
Options Exercisable
Shares
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
$0.01-15.70
65,852

 
1.81
 
$
9.82

 
65,852

 
$
9.82

$15.71-17.81
72,750

 
2.04
 
17.53

 
72,750

 
17.53

$17.82-20.48
86,836

 
2.59
 
19.60

 
86,836

 
19.60

$20.49-33.36
131,918

 
7.58
 
27.23

 
81,670

 
27.79

 
357,356

 
4.18
 
$
20.19

 
307,108

 
$
19.19
Status of Unvested Stock Options
The summary of the status of our unvested stock options as of December 31, 2016 and changes during the nine months ended September 30, 2017 is presented below.

 
 
 
Unvested stock options:
Shares
 
Weighted Average
Grant Date Fair Value Per Share
Unvested at December 31, 2016
50,833

 
$
12.67

Granted
32,750

 
11.93

Vested
(33,335
)
 
13.80

Unvested at September 30, 2017
50,248

 
$
11.44