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Property, Plant and Equipment - Lease liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lease liabilities    
Current portion (classified under other current liabilities) $ 3,068 $ 1,432
Non-current portion (classified under other non-current liabilities) 7,386 2,788
Total lease liabilities $ 10,454 $ 4,220