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Revenue
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
The Company’s 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 March 31,
20242023
Product revenue - gross93,112 71,212 
Less: Rebates and sales returns(5,963)(8,415)
Product revenue - net87,149 62,797 
Sales rebates are offered to distributors in mainland China, and the amounts are recorded as a reduction of 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 March 31,
20242023
ZEJULA45,501 42,680 
OPTUNE12,480 13,342 
QINLOCK6,093 1,306 
NUZYRA9,913 5,469 
VYVGART 13,162 — 
Product revenue - net87,149 62,797