v3.26.1
Parent only financial information - Condensed statements of cash flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed statements of cash flows      
Net cash used in operating activities $ (94,391) $ (59,980) [1] $ (172,440) [1]
Net cash (used in)/provided by investing activities (70,482) (8,121) [1] 87,265 [1]
Net cash provided by/(used in) financing activities 203,863 36,355 [1] 40,619 [1]
Effect of foreign currency exchange rate changes on cash and restricted cash 4,102 (2,183) [1] (2,030) [1]
Net decrease in cash 43,092 (33,929) [1] (46,586) [1]
Cash and restricted cash at the beginning of the year [1] 50,164 84,093 130,679
Cash and restricted cash at the end of the year 93,256 50,164 [1] 84,093 [1]
Parent company      
Condensed statements of cash flows      
Net cash used in operating activities (12,338) (6,460) (6,524)
Net cash (used in)/provided by investing activities (41,612) 8,198 (17,000)
Net cash provided by/(used in) financing activities 54,023 (3,000) 8,091
Effect of foreign currency exchange rate changes on cash and restricted cash 0 0 0
Net decrease in cash 73 (1,262) (15,433)
Cash and restricted cash at the beginning of the year 562 1,824 17,257
Cash and restricted cash at the end of the year $ 635 $ 562 $ 1,824
[1] Restated (refer to Note 2(c))