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Accounts payable and accrued expenses
3 Months Ended
Mar. 31, 2024
Payables and Accruals [Abstract]  
Accounts payable and accrued expenses

5.        Accounts payable and accrued expenses

Accounts payable and accrued expenses at March 31, 2024 and December 31, 2023 consist of the following:

March 31, 

December 31, 

    

2024

    

2023

Employee compensation, benefits, and related accruals

$

35,060

$

62,643

Income tax payable

1,833

Consulting and contracted research

 

22,745

 

27,500

Professional fees

 

2,380

 

2,246

Sales allowance

 

67,075

 

77,176

Sales rebates

 

132,047

 

131,334

Royalties

28,952

74,111

Accounts payable

 

27,459

 

6,045

Other

 

13,373

 

10,928

Total

$

330,924

$

391,983

As of March 31, 2024 and December 31, 2023, there were $1.7 million and $9.0 million, respectively, of accrued restructuring costs included above within employee compensation, benefits, and related accruals from a reduction in workforce in the year ended December 31, 2023 in connection with the Company’s strategic pipeline prioritization and discontinuation of its preclinical and early research programs in its gene therapy platform.