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Property, Plant and Equipment - Reconciliation of lease liabilities to cash flows arising from financing activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment    
Balance at beginning of year $ 15,860 $ 10,454
Change from financing activities:    
Payment of lease liabilities (4,294) (4,668)
Total change from financing activities (4,294) (4,668)
Other changes:    
New lease 2,395 11,247
Interest expense 222 213
Interest paid (222) (213)
Lease modifications (194)  
Disposal of subsidiary (138)  
Effect of exchange rate changes (1,954) (1,173)
Total liability-related other changes 109 10,074
Balance at end of year $ 11,675 $ 15,860