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Accrued Expenses and Other Current Liabilities
 9 Months Ended
Sep. 30, 2018
Payables And Accruals [Abstract]  
Accrued Expenses and Other Current Liabilities

4.

Accrued Expenses and Other Current Liabilities

 

 

 

September 30, 2018

 

 

December 31, 2017

 

Accrued external research and development expenses

 

$

4,146

 

 

$

1,770

 

Accrued payroll and related expenses

 

 

1,622

 

 

 

1,369

 

Accrued professional fees

 

 

727

 

 

 

878

 

Accrued manufacturing equipment

 

 

1,559

 

 

 

—

 

Accrued other

 

 

510

 

 

 

304

 

 

 

$

8,564

 

 

$

4,321