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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, 2020
Dec. 31, 2019
Property, Plant and Equipment    
Balance at beginning of year $ 4,220 $ 5,899
Change from financing activities:    
Payment of lease liabilities (2,608) (1,957)
Total change from financing activities (2,608) (1,957)
Other changes:    
New lease 8,474 246
Interest expense 155 112
Interest paid (155) (112)
Effect of exchange rate changes 368 32
Total liability-related other changes 8,842 278
Balance at end of year $ 10,454 $ 4,220