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Accounts payable and accrued expenses
6 Months Ended
Jun. 30, 2022
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses

5.        Accounts payable and accrued expenses

Accounts payable and accrued expenses at June 30, 2022 and December 31, 2021 consist of the following:

June 30, 

December 31, 

    

2022

    

2021

Employee compensation, benefits, and related accruals

$

35,834

$

55,733

Income tax payable

7,582

1,287

Consulting and contracted research

 

30,866

 

26,434

Professional fees

 

5,196

 

3,547

Sales allowance

 

64,335

 

61,662

Sales rebates

 

71,776

 

68,770

Royalties

34,230

35,679

Accounts payable

 

22,881

 

23,033

Milestone payable

50,000

Other

 

8,218

 

12,639

Total

$

330,918

$

288,784