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Cash and Cash Equivalents Changes in Net Working Capital (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]      
Changes in receivables and tax receivables $ 2,501 $ 337 $ (443)
Changes in trade payables (1,798) (507) (79)
Changes in other payables (918) (403) (459)
Changes in net working capital $ 215 $ 573 $ 981