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Share capital, share premium and other capital reserves - Preference share (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) tranche shares | Dec. 31, 2020 USD ($) tranche shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Share capital, share premium and other capital reserves |  |  |  |
Proceeds from Series C financing, net | $ 61,798 | $ 22,025 |  |
Share split, conversion ratio | 221 |  |  |
Tranche one |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Proceeds from issuance of shares net of cost of repurchase of stocks |  | $ 17,200 |  |
Tranche two and three |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Proceeds from issuance of shares net of cost of repurchase of stocks | $ 56,600 |  |  |
Common share |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Number of shares obliged to repurchase | shares |  | 331,500 |  |
Common share | Tranche two and three |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Number of shares obliged to repurchase | shares | 165,750 |  |  |
Series A Preference Shares |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Shares issued | shares |  |  |  | 1,755,845
Issue price | $ / shares |  |  |  | $ 0.68
Proceeds from Series C financing, net |  |  |  | $ 1,200
Number of shares obliged to repurchase | shares |  | 1,436,500 |  |
Amount of shares obliged to repurchase |  | $ 10,300 |  |
Number of remaining tranches | tranche | 2 |  |  |
Series A Preference Shares | Tranche one |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Number of shares obliged to repurchase | shares |  | 718,250 |  |
Amount of shares obliged to repurchase |  | $ 4,900 |  |
Series A Preference Shares | Tranche two and three |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Number of shares obliged to repurchase | shares | 718,250 |  |  |
Series B Preference Shares |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Shares issued | shares |  |  | 3,899,766 |
Issue price | $ / shares |  |  | $ 4.61 |
Proceeds from Series C financing, net |  |  | $ 17,900 |
Series C Preference Shares |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Proceeds from Series C financing, net |  | 84,400 |  |
Proceeds from issuance of shares net of issuance costs |  | $ 73,200 |  |
Number of tranches | tranche | 2 | 3 |  |
Issuance costs | $ 92 | $ 647 |  |
Series C Preference Shares | Tranche one |  |  |  |
Share capital, share premium and other capital reserves |  |  |  |
Shares issued | shares |  | 4,133,805 |  |
Proceeds from Series C financing, net |  | $ 22,700 |  |
Issuance costs |  | $ 600 |  |

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