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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
	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

X

- 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.

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amounts deferred under the terms of governmental, corporate, or foundation grants.

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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.

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-Topic 720
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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