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Other liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Other current liabilities      
Lease liability $ 3,306   $ 3,193
Total other current liabilities 3,306 $ 3,193 3,193
Other non-current liabilities      
Lease liability 30,088   30,975
Other 1,001   1,001
Total other non-current liabilities $ 31,089 $ 31,976 $ 31,976