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Subsequent events (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Subsequent events |  |  |  |
Number of options granted |  | 80,907,443 | 56,222,658 | 18,200,000
Share options with service condition only |  |  |  |
Subsequent events |  |  |  |
Number of options granted |  |  | 4,250,000 | 18,200,000
Subsequent event | Over allotment option | ADS |  |  |  |
Subsequent events |  |  |  |
Shares issued | 455,000 |  |  |
Public per share | $ 15.50 |  |  |
Net proceeds | $ 6,559 |  |  |
Subsequent event | Share options with service condition only |  |  |  |
Subsequent events |  |  |  |
Number of options granted | 5,485,508 |  |  |

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