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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2021
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |
Schedule of Property, Plant and Equipment, Depreciation, Estimated Lives | Property, plant and equipment are recorded at cost less accumulated depreciation. Depreciation is recognized on a straight-line basis over the following estimated useful lives: ​
​ | ​ | ​ | ​
Buildings and plant |  | 30 | years
Machinery and equipment |  | 15 | years
Furniture, fixtures and equipment |  | 3-10 | years
Motor vehicles |  | 6 | years
Schedule of Share-Based Compensation Expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
Selling, general and administrative expenses | ​ | $ | 15,463 | ​ | $ | 15,929 | ​ | $ | 8,389
Cost of revenues | ​ |  | 2,084 | ​ |  | 1,857 | ​ |  | 1,586
Research and development expenses | ​ |  | 350 | ​ |  | 122 | ​ |  | 102
Total | ​ | $ | 17,897 | ​ | $ | 17,908 | ​ | $ | 10,077

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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