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INVENTORIES | 12 Months Ended
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Dec. 31, 2022
INVENTORIES |
INVENTORIES | 4. INVENTORIES Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 |  | 2022
Raw materials | ​ | $ | 108,925 | ​ | $ | 59,780
Work-in-process | ​ |  | 20,593 | ​ |  | 12,531
Finished goods | ​ |  | 198,253 | ​ |  | 97,206
Total | ​ | $ | 327,771 | ​ | $ | 169,517
​ Inventory write-down was $2.0 million, nil and nil for the years ended December 31, 2020, 2021 and 2022.

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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 https://asc.fasb.org/topic&trid=2126998 + Details
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