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Accrued Expenses
 3 Months Ended
Mar. 31, 2019
Text Block [Abstract]  
Accrued Expenses
6.

Accrued Expenses

Accrued expenses consisted of the following:

 

        March 31,   
2019		      December 31,
2018		  

Accrued employee compensation and benefits

    $     1,239        924  

Accrued external research and development expenses

      819        754  

Accrued professional fees

      1,850        1,324  

Deferred rent, current portion

      —          93  

Other

      271        156  
  

 

 

     

 

 

  
   $ 4,179      $ 3,251