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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense Related to Stock Options
Stock-based compensation expense related to stock options is included in the following line items in the accompanying statements of operations:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Research and development
$
67

 
$
128

 
$
223

 
$
242

Selling, general and administrative
226

 
1,306

 
685

 
2,206

Discontinued operations (Note 13)

 
107

 

 
208

      Total
$
293

 
$
1,541

 
$
908

 
$
2,656