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Revenue
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Product Revenue
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 net product revenue ($ in thousands):
Year Ended December 31,
202320222021
Product revenue — gross298,911 234,009 190,180 
Less: Rebates and sales returns(32,192)(21,337)(46,075)
Product revenue — net266,719 212,672 144,105 
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):
Year Ended December 31,
202320222021
ZEJULA168,843 145,194 93,579 
OPTUNE46,969 47,321 38,903 
QINLOCK19,240 14,957 11,620 
NUZYRA21,656 5,200 3 
VYVGART10,011 — — 
Product revenue — net266,719 212,672 144,105