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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016 and was assigned to the same expense categories as the base compensation for such employees:
 
 
For the Three Months
Ended June 30,
 
For the Six Months
Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(In thousands)
Research and development expenses
 
$
246

 
$
258

 
$
477

 
$
530

Selling, general and administrative expenses
 
2,705

 
2,432

 
4,967

 
5,316

Total stock-based compensation
 
$
2,951

 
$
2,690

 
$
5,444

 
$
5,846