v3.26.3
Contract liabilities - ​Schedule of Contract liabilities (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CNY (¥)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Schedule of Contract liabilities [Line Items]        
Contract liabilities $ 1,100 ¥ 7,463 ¥ 189
Deferred revenue [Member]        
Schedule of Contract liabilities [Line Items]        
Contract liabilities   7,388  
Advance from customers [Member]        
Schedule of Contract liabilities [Line Items]        
Contract liabilities   ¥ 75 ¥ 189