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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Research and development and advertising costs, Government grants, Capitalized interest and Debt issuance cost (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Research and development and advertising costs |  |  |
Research and development expenses | ¥ 40,049 | ¥ 21,627 | ¥ 13,915
Advertising costs | 14,778 | 7,454 | 6,332
Government grants |  |  |
Deferred government grants in other long-term liabilities | 6,196 | 6,507 |
Deferred government grants in accrued expenses and other payables |  | 6,003 |
Capitalized interest |  |  |
Total interest costs | 1,402,015 | 1,040,898 | 749,730
Less: interest costs capitalized | (85,509) | (72,205) | (93,544)
Interest expenses | 1,316,506 | 968,693 | ¥ 656,186
Debt issuance costs |  |  |
Unamortised debt issuance costs | 226,085 | 273,822 |
Other long-term liabilities |  |  |
Government grants |  |  |
Deferred government grants in other long-term liabilities | 6,196 | 6,507 |
Accrued expenses and other payables |  |  |
Government grants |  |  |
Deferred government grants in accrued expenses and other payables | ¥ 0 | ¥ 6,003 |

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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings due under the terms of governmental grants. For classified balance sheets, represents the current amount deferred, that that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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