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Discontinued Operation - Summary of Cash Flows (Details) - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net cash used in operating activities $ (1,821) $ (5,324)
Net cash used in investing activities $ 0 $ (60)