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Discontinued operations - Net Cash Flows from Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Discontinued Operations [Abstract]    
Cash used in operating activities $ (113) $ (1,607)
Cash provided by investing activities 0 957
Cash used in financing activities 0 (20)
Cash used in discontinued operations $ (113) $ (670)