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Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
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 three months ended March 31, 2017, 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, 2016
1,222

 
$
1.99

 
1,198

 
$
1.99

Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Expired
—

 
—

 
 
 
 
Forfeited and canceled
—

 
—

 
 
 
 
Options outstanding, March 31, 2017
1,222

 
$
1.99

 
1,222

 
$
1.99
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Compensation Expense
Stock-based compensation expense related to stock options is allocated as follows for the three months ended March 31, 2017 and 2016 (in thousands):
 
Three Months Ended
 
March 31,
 
2017
 
2016
General and administrative
$
18

 
$
94

 
$
18

 
$
94