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Net loss per share (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
¥ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2022
Numerator:          
Net loss ¥ (112,591) $ (16,101) ¥ (47,955) ¥ (204,519)  
Numerator for basic and diluted net loss per share ¥ (112,591) $ (16,101) ¥ (47,955) ¥ (204,519)  
Denominator:          
Denominator for basic calculation-weighted average number of Class A and Class B ordinary shares outstanding (in shares) 228,840,636 228,840,636 231,533,388 243,025,428  
Denominator for diluted calculation (in shares) 228,840,636 228,840,636 231,533,388 243,025,428  
Net loss per share, basic          
-Basic (in rmb per share) | (per share) ¥ (0.49) [1] $ (0.07) ¥ (0.21) [1] ¥ (0.84) [1]  
Net loss per share, diluted          
-Diluted (in rmb per share) | (per share) ¥ (0.49) [1] $ (0.07) ¥ (0.21) [1] ¥ (0.84) [1]  
Class A ordinary shares          
Net loss per share, diluted          
Number of underlying shares represented by one ADR 1 1 1 1 1
ADS          
Denominator:          
Denominator for basic calculation-weighted average number of Class A and Class B ordinary shares outstanding (in shares) [1] 228,840,636 228,840,636 231,533,388 243,025,428  
Denominator for diluted calculation (in shares) [1] 228,840,636 228,840,636 231,533,388 243,025,428  
Net loss per share, basic          
-Basic (in rmb per share) | (per share) [1] ¥ (0.49) $ (0.07) ¥ (0.21) ¥ (0.84)  
Net loss per share, diluted          
-Diluted (in rmb per share) | (per share) [1] ¥ (0.49) $ (0.07) ¥ (0.21) ¥ (0.84)  
[1] Each ADS represents one Class A ordinary share.