TAXATION - Components of deferred taxes (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Deferred tax asset
Net operating loss	¥ 591,962	$ 84,649	¥ 540,787
Foreign exchange loss	3,813	545	2,140
Depreciation and amortization	18,837	2,694	16,212
Property, plant and equipment impairment	2,253	322	1,914
Deposits for non-current assets	17,725	2,535	17,725
Allowance for doubtful accounts	49,297	7,049	51,153
Lease liabilities	41,640	5,954	45,536
Other long-term assets	97,812	13,987	94,563
Equity investment	7,130	1,020	7,105
Others	7,890	1,128	10,506
Total deferred tax assets	838,359	119,883	787,641
less: Valuation allowance	(807,650)	(115,492)	(751,370)
Net deferred tax assets	30,709	4,391	36,271
Deferred tax liabilities
Equity investment	(41)	(6)	(999)
Property, plant and equipment	(16,747)	(2,395)	(16,110)
Disposal of Beijing Century Friendship	(3,126)	(447)	(3,126)
Intangible assets	(58,054)	(8,302)	(65,998)
Right-of-use assets	(29,165)	(4,171)	(32,497)
Others	1,422	205	(411)
Total deferred tax liabilities	(105,711)	(15,116)	(119,141)
Deferred tax assets, net	0	0	0
Deferred tax liabilities, net	¥ (75,002)	$ (10,725)	¥ (82,870)

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 from other capitalized interest.

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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 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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