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Property, Plant and Equipment - Lease liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Lease liabilities    
Current portion (classified under other current liabilities) $ 4,602 $ 3,068
Non-current portion (classified under other non-current liabilities) 11,258 7,386
Total lease liabilities $ 15,860 $ 10,454