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Certain Balance Sheet Items (Tables)
12 Months Ended
Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]  
Summary of Accounts Receivable
Accounts receivable consisted of the following (in thousands):
December 31,
2022
December 31,
2021
Accounts receivable from product sales to partners$62,979 $18,504 
Accounts receivable from revenues under collaborative agreements18,776 5,422 
Accounts receivable from royalty payments100,900 63,555 
Accounts receivable from other product sales6,229 4,634 
Contract assets44,102 — 
     Subtotal$232,986 $92,115 
Allowance for distribution fees and discounts(1,914)(1,140)
     Total accounts receivable$231,072 $90,975 
Summary of Inventories
Inventories consisted of the following (in thousands):
December 31,
2022
December 31,
2021
Raw materials$13,792 $10,672 
Work-in-process40,361 17,451 
Finished goods45,970 25,785 
     Total inventories$100,123 $53,908 
Summary of Prepaid Expenses and Other Assets
Prepaid expenses and other assets consisted of the following (in thousands):
December 31,
2022
December 31,
2021
Prepaid manufacturing expenses$51,694 $47,991 
Other prepaid expenses4,647 3,809 
Other assets14,984 2,096 
     Total prepaid expenses and other assets$71,325 $53,896 
Less long-term portion(26,301)(13,414)
     Total prepaid expenses and other assets, current$45,024 $40,482 
Summary of Property and Equipment Property and equipment, net consisted of the following (in thousands):
December 31,
2022
December 31,
2021
Research equipment$7,380 $7,174 
Manufacturing equipment27,893 5,719 
Computer and office equipment7,855 5,370 
Leasehold improvements6,729 1,628 
     Subtotal$49,857 $19,891 
Accumulated depreciation and amortization(14,756)(13,100)
Subtotal$35,101 $6,791 
Right of use of assets40,469 2,003 
     Property and equipment, net$75,570 $8,794 
Summary of Accrued Expenses
Accrued expenses consisted of the following (in thousands):
December 31,
2022
December 31,
2021
Accrued compensation and payroll taxes$19,939 $9,858 
Accrued outsourced manufacturing expenses12,190 6,514 
Income taxes payable— 1,439 
Product returns and sales allowance30,261 706 
Other accrued expenses29,771 3,648 
Lease liability34,788 2,820 
     Total accrued expenses$126,949 $24,985 
Less long-term portion(30,433)(544)
     Total accrued expenses, current$96,516 $24,441