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Revenue | 6 Months Ended
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Jun. 30, 2020
Revenue |
Revenue | 11.Revenue The Group’s revenue are primarily derived from the sale of ZEJULA and OPTUNE in mainland China and Hong Kong. The table below presents the Group’s net product sales for the six months ended June 30, 2019 and 2020. ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ |  | $ |  | $
​ | ​ | (Unaudited) | ​ | ​
Product revenue - gross | ​ | 3,420 | ​ | 20,415
Less: Rebate and sales return | ​ | — | ​ | (1,202)
Product revenue - net | ​ | 3,420 | ​ | 19,213
​ 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 distributor inventories. The following table disaggregates net revenue by product for the six months ended June 30, 2019 and 2020: ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ |  | $ |  | $
​ | ​ | (Unaudited) | ​ | ​
ZEJULA | ​ | 1,925 | ​ | 13,791
OPTUNE | ​ | 1,495 | ​ | 5,422
Total product revenue - net | ​ | 3,420 | ​ | 19,213
​

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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