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Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2019
Accrued Expenses  
Summary of accrued expenses

As of June 30, 2019 and December 31, 2018, accrued expenses consist of the following (in thousands):

 

 

 

 

 

 

 

 

 

As of

 

 

June 30, 

    

December 31, 

 

    

2019

 

2018

Accrued external research and development expense

 

$

2,669

 

$

3,284

Accrued payroll and related expenses

 

 

1,800

 

 

2,826

Accrued professional and consulting expense

 

 

871

 

 

890

Accrued other

 

 

244

 

 

157

 

 

$

5,584

 

$

7,157