Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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CONCENTRATION OF RISKS (Details) ¥ in Thousands	9 Months Ended		12 Months Ended
CONCENTRATION OF RISKS (Details) ¥ in Thousands	Sep. 30, 2024 CNY (¥) item customer	Sep. 30, 2023 item	Dec. 31, 2023 CNY (¥)
CONCENTRATION OF RISKS
Depreciation (appreciation) of RMB against US$	(1.10%)		1.70%
Customer Concentration Risk
CONCENTRATION OF RISKS
Number of customers who contributed more than 2% of Company's revenue \| customer	0
Cabinet and Bandwidth Supply
CONCENTRATION OF RISKS
Number of suppliers \| item	5	5
Bandwidth and Cabinet Resources \| Supplier Concentration Risk \| Largest five suppliers
CONCENTRATION OF RISKS
Concentration of risk, percentage	43.00%	43.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk \| Aggregate local subsidiaries of a telecommunication carrier
CONCENTRATION OF RISKS
Concentration of risk, percentage	5.00%	6.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk \| Customers on a stand-alone basis \| Minimum
CONCENTRATION OF RISKS
Concentration of risk, percentage	1.00%
Revenue from contract with customer benchmark \| Customer Concentration Risk
CONCENTRATION OF RISKS
Number of customer generated more than 10% but less than 20% of Company's revenue \| customer	1
Revenue from contract with customer benchmark \| Customer Concentration Risk \| Maximum
CONCENTRATION OF RISKS
Concentration of risk, percentage	20.00%
Revenue from contract with customer benchmark \| Customer Concentration Risk \| Minimum
CONCENTRATION OF RISKS
Concentration of risk, percentage		10.00%
PRC \| Credit Concentration Risk
CONCENTRATION OF RISKS
Cash and cash equivalents, restricted cash and short-term investments, held at major institutions \| ¥	¥ 1,971,126		¥ 2,431,089
Outside the PRC \| Credit Concentration Risk
CONCENTRATION OF RISKS
Cash and cash equivalents, restricted cash and short-term investments, held at major institutions \| ¥	¥ 18,058		¥ 426,022