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Accrued Expenses and Other Current Liabilities
12 Months Ended
Dec. 31, 2019
Payables And Accruals [Abstract]  
Accrued Expenses and Other Current Liabilities

6. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

 

 

 

December 31,

2019

 

 

December 31,

2018

 

External research and development services

 

$

1,673

 

 

$

1,307

 

Payroll and payroll-related costs

 

 

1,281

 

 

 

1,473

 

Professional fees

 

 

635

 

 

 

436

 

Other

 

 

352

 

 

 

423

 

 

 

$

3,941

 

 

$

3,639