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Inventories | 6 Months Ended
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Jun. 30, 2020
Inventories |
Inventories | 7.Inventories The Group’s inventory balance of $6,005 and $6,569 as of December 31, 2019 and June 30, 2020, respectively, mainly consisted of finished goods purchased from Tesaro Inc.("Tesaro") and Novocure Limited ("Novocure") for distribution in Hong Kong and Macau, as well as certain raw materials purchased for ZEJULA commercialization in the PRC. ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ |  | December 31, |  | June 30,
​ | ​ | 2019 | ​ | 2020
​ |  | $ | ​ | $
Finished goods | ​ | 593 | ​ | 838
Raw materials | ​ | 5,412 | ​ | 5,738
Inventories | ​ | 6,005 | ​ | 6,576
Inventory write-down: | ​ |  | ​ |
Balance at beginning of the year | ​ | — | ​ | —
Additions | ​ | — | ​ | (7)
Write-offs | ​ | — | ​ | —
Inventories | ​ | 6,005 | ​ | 6,569
​

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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