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Organization and principal activities - Schedule of Condensed Consolidated Cash Flows Data for the VIEs (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Investments in and Advances to Affiliates        
Net cash provided by (used in) operating activities ¥ (176,152) $ (25,191) ¥ 94,283 ¥ (32,081)
Net cash provided by investing activities 2,185,278 312,492 3,678,535 53,206
Net cash used in financing activities (2,498,192) $ (357,237) (3,104,671) (202,294)
Variable Interest Entity (VIE)        
Investments in and Advances to Affiliates        
Net cash provided by (used in) operating activities (352,269)   24,602 56,821
Other investing activities 338,817   (22,838) (49,263)
Net cash provided by investing activities ¥ 338,817   ¥ (22,838) ¥ (49,263)