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Share based compensation - Compensation expense recognized (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
2021 Option Plan |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | ¥ 8,095 |  | ¥ 201,098 |
2021 Option Plan | Research and development expenses |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | 1,205 |  | 93,824 |
2021 Option Plan | Selling, general and administrative expenses |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | 6,890 |  | 107,274 |
RSU |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | 165,930 |  | 524,553 | ¥ 163,481
RSU | Research and development expenses |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | 26,590 |  | 42,986 | 80,872
RSU | Selling, general and administrative expenses |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | 139,340 |  | 481,567 | 76,085
RSU | Cost of revenues |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized | ¥ 0 |  | 0 | ¥ 6,524
RSU | 2021 Option Plan |  |  |  |
Share based compensation |  |  |  |
Total compensation expense recognized |  | $ 16,311 | ¥ 105,211 |

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