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Share-based compensation - Number of option and exercise price (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Option $ / shares | Dec. 31, 2021 USD ($) Option $ / shares | Dec. 31, 2020 Option $ / shares
Share-based compensation |  |  |
Granted, Number of options | $ | 2,358,458 | 1,801,088 |
2018 Stock Option Plan |  |  |
Share-based compensation |  |  |
Outstanding at Beginning, Number of options | Option | 620,347 | 620,347 |
Exercised, Number of options | Option | (16,073) |  |
Forfeited, Number of options | Option | (3,817) |  |
Outstanding at ending, Number of options | Option | 600,457 | 620,347 | 620,347
Exercisable, Number of options | Option | 387,565 |  |
Outstanding at Beginning, Weighted average exercise price | $ 0.01 | $ 0.01 |
Exercised, Weighted average exercise price | 0.01 |  |
Forfeited, Weighted average exercise price | 0.01 |  |
Outstanding at ending, Weighted average exercise price | 0.01 | $ 0.01 | $ 0.01
2018 Stock Option Plan | Bottom of range |  |  |
Share-based compensation |  |  |
Exercised, Weighted average exercise price | 0.01 |  |
2018 Stock Option Plan | Top of range |  |  |
Share-based compensation |  |  |
Exercised, Weighted average exercise price | $ 15.00 |  |
2020 U.S. Stock Option Plan, |  |  |
Share-based compensation |  |  |
Outstanding at Beginning, Number of options | Option | 1,563,136 | 1,069,198 |
Granted, Number of options | Option |  | 493,938 |
Exercised, Number of options | Option | (6,124) |  |
Forfeited, Number of options | Option | (284,933) |  |
Outstanding at ending, Number of options | Option | 1,272,079 | 1,563,136 | 1,069,198
Exercisable, Number of options | Option | 717,532 |  |
Outstanding at Beginning, Weighted average exercise price | $ 5.90 | $ 2.76 |
Granted, Weighted average exercise price |  | 12.69 |
Exercised, Weighted average exercise price | 2.76 |  |
Forfeited, Weighted average exercise price | 13.46 |  |
Outstanding at ending, Weighted average exercise price | $ 4.22 | $ 5.90 | $ 2.76
Outstanding, Weighted average remaining contractual term | 7 years 9 months 29 days | 8 years 10 months 24 days | 9 years 6 months
Granted, Weighted average remaining contractual term |  | 9 years 2 months 15 days |
2021 Long-term Incentive Option Plan |  |  |
Share-based compensation |  |  |
Outstanding at Beginning, Number of options | Option | 1,307,150 |  |
Granted, Number of options | 2,358,458 | 1,307,150 |
Forfeited, Number of options | Option | (258,014) |  |
Outstanding at ending, Number of options | 3,407,594 | 1,307,150 |
Exercisable, Number of options | Option | 470,454 |  |
Outstanding at Beginning, Weighted average exercise price | $ 6.03 |  |
Granted, Weighted average exercise price | 4.01 | $ 6.03 |
Forfeited, Weighted average exercise price | 5.75 |  |
Outstanding at ending, Weighted average exercise price | $ 4.66 | $ 6.03 |
Outstanding, Weighted average remaining contractual term | 9 years 6 months 14 days | 9 years 10 months 24 days |
Granted, Weighted average remaining contractual term | 9 years 9 months 14 days | 9 years 10 months 24 days |

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