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v3.21.2

CONCENTRATION OF RISKS (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 customer USD ($) | Dec. 31, 2019 customer USD ($) | Dec. 31, 2018 customer USD ($)
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Foreign currency exchange rate risk |  |  |
Appreciation and depreciation of the RMB against US dollar (as a percent) | 6.30% | 1.30% | 5.70%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | customer | 5 | 5 | 5
Concentration risk percentage | 25.85% | 34.60% | 35.00%
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 95.00% | 97.00% | 90.00%
Number of suppliers | $ | 5 | 5 | 5

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