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Accrued expenses and other current liabilities (Tables)
3 Months Ended
Mar. 31, 2020
Payables and Accruals [Abstract]  
Schedule of accrued expenses and other current liabilities
Accrued expenses and other current liabilities consisted of the following (in thousands):
 
March 31,
 
December 31,
 
2020
 
2019
Research and development costs
$
2,507

 
$
1,607

Payroll and employee-related costs
730

 
2,245

Other current liabilities
840

 
759

Total
$
4,077

 
$
4,611