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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Concentration of credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Concentration of credit risk |  |
Advances to suppliers | $ 182,146 | $ 47,978
Supplier A |  |
Concentration of credit risk |  |
Advances to suppliers | $ 43,821 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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