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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign currency translation and foreign currency risks (Details) € in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 HKD ($) | Dec. 31, 2020 JPY (¥) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 SGD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | --- | --- | --- | ---
RMB |  |  |  |  |  |  |
Cash and restricted cash | ¥ | ¥ 3,554,424 |  |  |  |  |  | ¥ 2,119,758
USD |  |  |  |  |  |  |
Cash and restricted cash | 12,769,100 | $ 1,956,980 |  |  |  |  |
HKD |  |  |  |  |  |  |
Cash and restricted cash | 156,461 |  | $ 185,909 |  |  |  |
JPY |  |  |  |  |  |  |
Cash and restricted cash | 2,265 |  |  | ¥ 35,821 |  |  |
EUR |  |  |  |  |  |  |
Cash and restricted cash | 1,175 |  |  |  | € 146 |  |
SGD |  |  |  |  |  |  |
Cash and restricted cash | 9,504 |  |  |  |  | $ 1,927 |
PRC | RMB |  |  |  |  |  |  |
Cash and restricted cash | ¥ | 3,528,438 |  |  |  |  |  |
PRC | USD |  |  |  |  |  |  |
Cash and restricted cash |  | 1,337,547 |  |  |  |  |
Hong Kong SAR | RMB |  |  |  |  |  |  |
Cash and restricted cash | ¥ | ¥ 25,986 |  |  |  |  |  |
Hong Kong SAR | USD |  |  |  |  |  |  |
Cash and restricted cash |  | 511,405 |  |  |  |  |
Hong Kong SAR | HKD |  |  |  |  |  |  |
Cash and restricted cash |  |  | $ 185,909 |  |  |  |
Hong Kong SAR | JPY |  |  |  |  |  |  |
Cash and restricted cash | ¥ |  |  |  | ¥ 35,821 |  |  |
Hong Kong SAR | EUR |  |  |  |  |  |  |
Cash and restricted cash | € |  |  |  |  | € 146 |  |
US | USD |  |  |  |  |  |  |
Cash and restricted cash |  | 10,271 |  |  |  |  |
Singapore | USD |  |  |  |  |  |  |
Cash and restricted cash |  | $ 97,757 |  |  |  |  |
Singapore | SGD |  |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  | $ 1,927 |

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- Definition The carrying amounts of cash and restricted cash. + References No definition available. + Details
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