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INVENTORIES | 12 Months Ended
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Dec. 31, 2020
INVENTORIES |
INVENTORIES | 4. INVENTORIES Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
Raw materials |  | 75,722 |  | 90,308
Work-in-process |  | 74,105 |  | 69,132
Finished goods |  | 404,243 |  | 536,541
​ |  | 554,070 |  | 695,981
​ Finished goods include modules of $84,202 and $181,012 as of December 31, 2019 and 2020, respectively, that allow solar energy systems to qualify for the U.S. Federal Investment Tax Credit by satisfying the 5% safe harbor method outlined in the U.S. Internal Revenue Service (IRS) guidance notice. In 2018, 2019 and 2020, inventory was written down by $14,646, $19,447 and $42,907, respectively, to reflect the lower of cost and net realizable value.

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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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