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Accrued Expenses (Tables)
3 Months Ended
Mar. 31, 2017
Payables and Accruals [Abstract]  
Summary of Accrued Expenses

Accrued expenses consist of the following (in thousands):

 

     March 31,
2017
     December 31,
2016
 

Accrued compensation

   $ 5,285      $ 11,092  

Accrued research and development costs

     13,474        20,266  

Accrued professional fees

     5,060        476  

Accrued other

     1,295        168  
  

 

 

    

 

 

 

Total

   $ 25,114      $ 32,002