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Stock Based Compensation (Tables) - Stock Options
 9 Months Ended
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity
A summary of stock options granted, exercised, expired and forfeited under our stock incentive plans and stock options outstanding as of, and changes made during, the nine months ended September 30, 2016, is presented below (shares in thousands):
 
Outstanding
 
Exercisable
 
Number of Shares Underlying Options
 
Weighted
Average
Exercise
Price
 
Number of Shares Underlying Options
 
Weighted
Average
Exercise
Price
Options outstanding, December 31, 2015
1,269

 
$
1.98

 
960

 
$
1.99

Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Expired
(15
)
 
1.53

 
 
 
 
Forfeited and canceled
(32
)
 
1.83

 
 
 
 
Options outstanding, September 30, 2016
1,222

 
$
1.99

 
1,137

 
$
2.00
Summary of Compensation Expense
Stock-based compensation expense related to stock options is allocated as follows for the three and nine months ended September 30, 2016 and 2015 (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
General and administrative
$
89

 
$
94

 
$
272

 
$
292

 
$
89

 
$
94

 
$
272

 
$
292