RELATED PARTY TRANSACTIONS - Related party transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
RELATED PARTY TRANSACTIONS
Loan to:	¥ 16,800		¥ 142,895	$ 2,436	¥ 0
Interest income from:	6,946	$ 1,007	3,447	1,009	127
Loan from:	220,369		24,432	31,951	199,000
Interest expense to:	16,790	$ 2,434	13,532	2,434	41,918
Repayment to:	82,915		80,886	12,022	272,640
Repayment from:	0		2,430	0	1,485
JYADK
RELATED PARTY TRANSACTIONS
Interest income from:	0		650	0	127
Repayment from:	0		2,430	0	1,485
Cherrylane Investment Limited
RELATED PARTY TRANSACTIONS
Loan from:	0		15,932	0	0
Interest expense to:	1,334		554	193	587
Repayment to:	0		3,824	0	0
Zhejiang Marine Leasing Ltd
RELATED PARTY TRANSACTIONS
Loan from:	220,369		8,500	31,951	199,000
Interest expense to:	15,456		12,978	2,241	41,331
Repayment to:	82,915		77,062	12,022	272,640
Guangdong Proton International Hospital Management Co., Ltd
RELATED PARTY TRANSACTIONS
Loan to:	16,800		142,895	2,436	0
Interest income from:	¥ 6,961		¥ 2,797	$ 1,009	¥ 0

Amount of interest expense incurred on a debt or other obligation to related party.

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Amount of interest income earned from interest-bearing assets owed to the entity by related party.

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The cash outflow for a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

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