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Equity - Accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]      
Beginning balance $ (666)    
Exchange differences arising on translation of foreign operations 88 $ 0 $ 44
Changes in fair value of financial assets 10 (2) (2)
Remeasurement of defined benefit pension plans 26 5 (1)
Ending balance (218) (666)  
Accumulated other comprehensive income      
Statement [line items]      
Beginning balance (666) (548) (952)
Exchange differences arising on translation of foreign operations (245) (72) 512
Changes in fair value of financial assets 142 (179) 67
Remeasurement of defined benefit pension plans 551 133 (175)
Ending balance (218) (666) (548)
Defined benefit pension plans      
Statement [line items]      
Beginning balance 238 105 280
Exchange differences arising on translation of foreign operations 0 0 0
Changes in fair value of financial assets 0 0 0
Remeasurement of defined benefit pension plans 551 133 (175)
Ending balance 789 238 105
Unrealized gain (losses) on securities      
Statement [line items]      
Beginning balance (1,048) (869) (936)
Exchange differences arising on translation of foreign operations 0 0 0
Changes in fair value of financial assets 142 (179) 67
Remeasurement of defined benefit pension plans 0 0 0
Ending balance (906) (1,048) (869)
Foreign currency translation      
Statement [line items]      
Beginning balance 144 216 (296)
Exchange differences arising on translation of foreign operations (245) (72) 512
Changes in fair value of financial assets 0 0 0
Remeasurement of defined benefit pension plans 0 0 0
Ending balance $ (101) $ 144 $ 216