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Discontinued operations - Net Cash Flows from Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Discontinued Operations [Abstract]    
Cash used in operating activities $ (3,601) $ (12,259)
Cash provided by (used in) investing activities 47 (78)
Cash used in financing activities (234) (210)
Cash used in discontinued operations $ (3,788) $ (12,547)