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v3.22.2.2

Segment information (Details 3) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Customer D |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 0 | 5
Customer C |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 6 | 10
Customer B |  |  |
Customers accounting for more than 5% of the Group's revenue | 0 | 8 | 0
Customer A |  |  |
Customers accounting for more than 5% of the Group's revenue | 15 | 9 | 19

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