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Discontinued Operation - Summary of Amounts Included in Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating expenses:    
Net loss $ (15) $ (2,919)
Discontinued Operations, Disposed of by Sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues 0 904
Cost of revenues 0 6
Gross profit 0 898
Operating expenses:    
Sales and marketing 0 1,712
Product development 0 0
General and administrative 12 2,639
Total operating expenses 12 4,351
Loss from operations (12) (3,453)
Other income (loss), net (3) 534
Loss before income taxes (15) (2,919)
Income tax expense 0 0
Net loss $ (15) $ (2,919)