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TAXATION - Components of deferred tax assets (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | --- | --- | ---
TAXATION |  |  |  |  |
Temporary differences related to expenses and accruals | ¥ 460 | $ 66 | ¥ 530 |  |
Temporary differences related to impairment on advances to suppliers | 306 | 44 | 306 |  |
Temporary differences related to provision for credit losses | 601 | 86 | 600 |  |
Others | 23 | 3 | 0 |  |
Temporary differences related to depreciation, amortization, and impairment of equipment and intangible assets | (3,317) | (474) | (3,392) |  |
Startup expenses and advertising fees | 14 | 2 | 33 |  |
Temporary differences related to equity investments | 14,041 | 2,008 | 7,747 |  |
Temporary differences related to provision for prepayment for equipment | 0 | 0 | 0 |  |
Tax loss carry forwards | 97,392 | 13,926 | 142,365 |  |
Total deferred tax assets | 109,520 | 15,661 | 148,189 |  |
Less: Valuation allowance | (109,520) | (15,661) | (148,189) | $ (21,191) | ¥ (84,879)
Total deferred tax assets | ¥ 0 | $ 0 | ¥ 0 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from equity method investments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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