v3.26.1
Condensed financial information of the parent company - Condensed Statements of Cash Flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Condensed Statements of Cash Flows        
Net cash (used in)/provided by operating activities ¥ 64,885 $ 9,280 ¥ 8,541 ¥ (17,907)
Net cash used in investing activities (7,457) (1,065) (5,375) 25,126
Net cash used in financing activities (8,047) (1,151) 1,225 (8,651)
Effect of exchange rate changes (589) (86) 149 179
Net (decrease)/increase in cash and cash equivalents and restricted cash 48,792 6,978 4,540 (1,253)
Cash, cash equivalents and restricted cash at the beginning of year 119,547 17,094 115,007 116,260
Cash, cash equivalents and restricted cash at the end of year 168,339 24,072 119,547 115,007
Parent Company        
Condensed Statements of Cash Flows        
Net cash (used in)/provided by operating activities 19,477 2,785 6,282 (23,234)
Net cash used in financing activities (5,047) (722) (1,775) (3,651)
Effect of exchange rate changes 5,487 785 (4,544) (3,658)
Net (decrease)/increase in cash and cash equivalents and restricted cash 19,917 2,848 (37) (30,543)
Cash, cash equivalents and restricted cash at the beginning of year 3,291 471 3,328 33,871
Cash, cash equivalents and restricted cash at the end of year ¥ 23,208 $ 3,319 ¥ 3,291 ¥ 3,328