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Fair value measurement (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Level 1    
Financial assets:    
Investments subject to significant influence $ 6,420 $ 5,108
Other investments 1,871 2,220
Total financial assets 8,291 7,328
Financial liabilities:    
Total financial liabilities 0 0
Level 2    
Financial assets:    
Investments subject to significant influence 0 0
Other investments 0 0
Total financial assets 0 0
Financial liabilities:    
Total financial liabilities 0 0
Level 3    
Financial assets:    
Investments subject to significant influence 0 0
Other investments 0 0
Total financial assets 0 0
Financial liabilities:    
Total financial liabilities $ 0 $ 0