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Discontinued Operations - Summary of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Discontinued Operations, Disposed of by Sale | Travelzoo Singapore    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net cash used in operating activities $ (10) $ (37)