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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, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Balance at beginning of year $ 10,454 $ 4,220
Change from financing activities:    
Payment of lease liabilities (4,668) (2,608)
Total change from financing activities (4,668) (2,608)
Other changes:    
New lease 11,247 8,474
Interest expense 213 155
Interest paid (213) (155)
Effect of exchange rate changes (1,173) 368
Total liability-related other changes 10,074 8,842
Balance at end of year $ 15,860 $ 10,454