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Taxation - Reconciliation of income tax expense at statutory tax rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Taxation      
Loss before income tax $ (31,658) $ (42,198) $ (15,884)
Computed 25.8% tax on Loss (2021/2020: 25%) $ (8,168) $ (10,549) $ (3,971)
Computed Tax rate on Loss 25.80% 25.00% 25.00%
Non-deductible costs $ 1,080 $ 982 $ 124
Unrecognized deferred tax for losses and temporary differences 7,192 9,435 3,939
Difference in overseas tax rates 72 46 30
Change in deferred tax asset 72 244 (18)
Previously unrecognized tax losses now recouped to reduce current tax expense     (61)
Total corporate tax $ 249 $ 157 $ 43
Effective tax rate (0.80%) (0.40%) (0.30%)