TAXATION - Components of deferred taxes (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Deferred tax asset
Net operating loss	¥ 540,787	$ 74,088	¥ 425,390
Foreign exchange loss	2,140	293	2,755
Depreciation and amortization	16,212	2,221	17,647
Property, plant and equipment impairment	1,914	262	2,340
Deposits for non-current assets	17,725	2,428	17,725
Allowance for doubtful accounts	51,153	7,008	29,299
Lease liabilities	45,536	6,238	59,875
Other long-term assets	94,563	12,955	94,791
Equity investment	7,105	973	7,005
Others	10,506	1,439	11,770
Total deferred tax assets	787,641	107,905	668,597
less: Valuation allowance	(751,370)	(102,937)	(623,044)
Net deferred tax assets	36,271	4,968	45,553
Deferred tax liabilities
Equity investment	(999)	(137)	(1,091)
Property, plant and equipment	(16,110)	(2,207)	(2,368)
Disposal of Beijing Century Friendship	(3,126)	(428)	(3,126)
Intangible assets	(65,998)	(9,041)	(71,825)
Right-of-use assets	(32,497)	(4,452)	(45,626)
Capitalized interest	0	0	(18,993)
Others	(411)	(56)	(2,062)
Total deferred tax liabilities	(119,141)	(16,321)	(145,091)
Deferred tax assets, net	0	0	0
Deferred tax liabilities, net	¥ (82,870)	$ (11,353)	¥ (99,538)

Amount of deferred tax assets deposits.

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Amount of deferred tax assets depreciation and amortization.

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Amount before allocation of valuation allowances of deferred tax asset attributable to Equity Investment.

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Amount of property, plant and equipment impairment.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from provisions, reserves, allowances, and accruals, classified as other.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on accounts receivable.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from allowance for credit loss on financing receivable.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from capitalized interest.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.

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Amount of deferred tax liability attributable to taxable temporary differences from the entity's basis in a discontinued operation.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or income classified as other.

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