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Discontinued Operation - Summary of Cash Flows (Details) - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net cash used in operating activities $ (37) $ (1,026)
Net cash used in investing activities $ 0 $ 0