Accrued expenses (Tables)
 9 Months Ended
Sep. 30, 2016
Accrued expenses  
Schedule of accrued expenses

Accrued expenses consisted of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

 

As of

 

 

 

September 30, 

 

December 31, 

 

 

    

2016

    

2015

 

Patent and license fees

 

$
5,762

 

$
3,395

 

Deferred initial public offering costs

 

 

 —

 

 
283

 

Employee compensation costs

 

 
1,930

 

 
1,016

 

Professional services

 

 
1,163

 

 
382

 

Other

 

 
637

 

 
380

 

Total

 

$
9,492

 

$
5,456