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Income Tax - Schedule of Deferred Tax Assets and Liabilities (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Deferred Tax Assets and Liabilities [Abstract]      
Net operating loss carryforward ¥ 31,234 ¥ 31,334  
Advertisement expense 37 37  
Impairment/disposal of property and equipment 7,071 6,954  
Deferred revenue 7,385 7,385  
GAAP difference-others (57) (172)  
Allowance for credit losses 797 517  
Net deferred tax liabilities offset (3,501) (3,517)  
Less: Valuation allowance (42,966) (42,538) ¥ (41,378)
Total deferred tax assets, net  
Unbilled revenue (5,418) (4,143)  
Total deferred tax liabilities (5,418) (4,143)  
Deferred tax assets offset 3,501 3,517  
Net deferred tax liabilities ¥ (1,917) ¥ (626)