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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Concentration of credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Concentration of credit risk |  |
Advances to suppliers | $ 225,879 | $ 182,146
Supplier | Supplier A |  |
Concentration of credit risk |  |
Advances to suppliers | 52,257 | $ 43,821
Supplier | Supplier B |  |
Concentration of credit risk |  |
Advances to suppliers | 37,117 |
Supplier | Supplier C |  |
Concentration of credit risk |  |
Advances to suppliers | $ 36,026 |

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- Definition Carrying value of capitalized payments made in advance for inventory that is expected to be received within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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