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Accrued Expenses
3 Months Ended
Mar. 31, 2018
Payables and Accruals [Abstract]  
Accrued Expenses

4. Accrued Expenses

Accrued expenses consisted of the following as of March 31, 2018 and December 31, 2017:

 

     March 31,
2018
     December 31,
2017
 
     (in thousands)  

Accrued research and development expenses

   $ 2,075      $ 1,647  

Accrued payroll and related expenses

     836        2,229  

Accrued professional fees

     564        292  

Accrued other

     186        105  
  

 

 

    

 

 

 
   $ 3,661      $ 4,273