Share-based compensation (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Share-based compensation. |
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| Summary of the restricted share units activity |
| | | | | | | | | Weighted | | | Number of | | average | | | restricted | | grant-date | | | shares units | | fair value (US$) | | | | | | Outstanding, December 31, 2022 | | 17,535,567 | | 2.5551 | | | | | | Granted | | 7,744,374 | | 1.7842 | Forfeited | | (2,688,963) | | 2.1666 | Vested | | (8,058,007) | | 2.8052 | | | | | | Outstanding, December 31, 2023 | | 14,532,971 | | 2.0776 | | | | | | Granted | | 10,968,657 | | 1.7669 | Forfeited | | (2,047,879) | | 1.9403 | Vested | | (7,319,654) | | 2.3032 | | | | | | Outstanding, December 31, 2024 | | 16,134,095 | | 1.7834 | | | | | | Granted | | 15,895,447 | | 2.6261 | Forfeited | | (2,361,856) | | 2.0989 | Vested | | (7,237,585) | | 1.8973 | | | | | | Outstanding, December 31, 2025 | | 22,430,101 | | 2.3106 | | | | | | Expected to vest as of December 31, 2025 | | 19,160,592 | | 2.2921 |
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| Summary of restricted shares activity |
| | | | | | | | | Weighted | | | Number of | | average | | | restricted | | grant-date fair | | | shares | | value (US$) | | | | | | Outstanding, December 31, 2022 | | 10,935,436 | | 2.8002 | | | | | | Granted | | 1,146,257 | | 1.8259 | Forfeited | | (1,142,786) | | 2.2756 | Vested | | (5,426,078) | | 3.0559 | | | | | | Outstanding, December 31, 2023 | | 5,512,829 | | 2.4547 | | | | | | Granted | | 882,988 | | 1.6971 | Forfeited | | (886,951) | | 2.2159 | Vested | | (2,258,324) | | 2.6870 | | | | | | Outstanding, December 31, 2024 | | 3,250,542 | | 2.1458 | | | | | | Granted | | 853,559 | | 2.4498 | Forfeited | | (875,922) | | 2.2276 | Vested | | (1,613,485) | | 2.3462 | | | | | | Outstanding, December 31, 2025 | | 1,614,694 | | 2.0619 | | | | | | Expected to vest as of December 31, 2025 | | 1,597,874 | | 2.0626 |
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| Summary of share options granted and their related weighted average exercise prices |
| | | | | | | | | | | | | | | Weighted | | | | | | | Weighted | | average | | Aggregate | | | | | average | | remaining | | intrinsic | | | Number of | | exercise | | contractual life | | value | | | options | | price (US$) | | (years) | | (US$) | | | | | | | | | | Outstanding, January 1, 2023 | | 9,414,400 | | 3.7997 | | 1.80 | | — | | | | | | | | | | Forfeited | | (840,180) | | 3.5350 | | — | | — | | | | | | | | | | Outstanding, December 31, 2023 | | 8,574,220 | | 3.8256 | | 1.61 | | — | | | | | | | | | | Forfeited | | (499,720) | | 3.5350 | | — | | — | | | | | | | | | | Outstanding, December 31, 2024 | | 8,074,500 | | 3.8436 | | 0.76 | | — | | | | | | | | | | Forfeited | | — | | — | | — | | — | | | | | | | | | | Outstanding, December 31, 2025 | | 8,074,500 | | 3.8436 | | 0.38 | | — | | | | | | | | | | Expected to vest as of December 31, 2025 | | 8,074,500 | | 3.8436 | | 0.38 | | — | Exercisable as of December 31, 2025 | | 8,074,500 | | 3.8436 | | 0.38 | | — |
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