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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Schedule of allocated non-cash, stock-based compensation expense for all employees Total non-cash, stock-based compensation expense is shown in the following table for the three and nine months ended September 30, 2017 and 2016 and was assigned to the same expense categories as the base compensation for such employees:
 
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In thousands)
Research and development expenses
 
$
297

 
$
297

 
$
774

 
$
827

Selling, general and administrative expenses
 
2,965

 
2,311

 
7,932

 
7,627

Total stock-based compensation
 
$
3,262

 
$
2,608

 
$
8,706

 
$
8,454