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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Research and development
$
86

 
$
62

 
$
156

 
$
114

Selling, general and administrative
256

 
689

 
460

 
900

Discontinued operations (Note 12)
—

 
68

 
—

 
101

      Total
$
342

 
$
819

 
$
616

 
$
1,115