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Revenues
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Product Revenue, Net
The Company’s product revenue is derived from the sales of its commercial products primarily in mainland China. The table below presents the Company’s gross and net product revenue ($ in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Product revenue - gross107,678 74,018 307,401 220,240 
Less: Rebates and sales returns(5,831)(4,790)(18,299)(19,351)
Product revenue - net101,847 69,228 289,102 200,889 
Sales rebates are offered to distributors in mainland China, and the amounts are recorded as a reduction of product revenue. Estimated rebates are determined based on contracted rates, sales volumes, and level of distributor inventories.
The following table presents the Company’s net revenue by product ($ in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
ZEJULA48,227 41,593 138,727 127,230 
OPTUNE7,715 11,562 32,779 38,596 
QINLOCK8,643 5,702 21,774 14,535 
NUZYRA9,997 5,483 32,205 15,588 
VYVGART 27,265 4,888 63,617 4,940 
Product revenue - net101,847 69,228 289,102 200,889 
Collaboration Revenue
Collaboration revenue was $0.4 million and $0.8 million in the three and nine months ended September 30, 2024, respectively, and related to promotional activities in mainland China. We had no such collaboration revenue in the prior year periods.