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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenue recognition - Contract assets and liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Contract Assets |  |
Accounts receivables, unbilled | $ 28,461 | $ 15,256
Contract Liabilities |  |
Advances from customers | 189,470 | 134,806
Other current liabilities | 35,012 | 20,917
Contract liability | 224,482 | $ 155,723
Revenue recognized from beginning balance of contract liabilities | 139,387 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |
Contract Liabilities |  |
Contract liabilities expected to be recognized | $ 224,482 |
Period for contract liabilities expected to be realized | 1 year |

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