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Accrued Expenses and Other Current Liabilities
12 Months Ended
Dec. 31, 2020
Accrued Expenses and Other Current Liabilities  
Accrued Expenses and Other Current Liabilities

7.  Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities include the following:

As of December 31,

(in thousands)

    

2019

    

2020

Research and development related costs

$

1,347

$

1,055

Payroll and related costs

 

6,327

 

4,049

Accounting, tax and audit services

 

420

 

470

Manufacturing and inventory

639

4,779

Accrued gross to net

534

662

Other

 

2,699

 

1,829

Total other current liabilities

$

11,966

$

12,844