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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of allocation of total stock-based compensation expense
The following table reflects stock-based compensation expense recognized for the three and nine months ended September 30, 2017 and 2016 (in thousands):
 
Three Months Ended
 September 30,
 
Nine Months Ended
 September 30,
 
2017
 
2016
 
2017
 
2016
Research and development
$
837

 
$
738

 
$
2,553

 
$
2,136

Selling, general and administrative
2,425

 
1,860

 
7,358

 
5,646

Total stock-based compensation expense
$
3,262

 
$
2,598

 
$
9,911

 
$
7,782