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Other income net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other income: |  |  |
Exchange gain / (loss), net | $ (93) | $ 77 | $ 101
Rental income | 37 | 50 | 59
Government subsidies - Employment Support Scheme | 69 | 0 | 147
Other income, net | $ 13 | $ 127 | $ 307

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