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Discontinued Operations - Summary of Amounts Included in Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Operating expenses:                    
Net loss $ 554 $ (230) $ (795) $ (2,919) $ (2,319) $ (2,258) $ (1,730) $ (1,825) $ (3,390) $ (8,132)
Discontinued Operations, Disposed of by Sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Revenues                 970 6,482
Cost of revenues                 6 453
Gross profit                 964 6,029
Operating expenses:                    
Sales and marketing                 1,712 9,008
Product development                 0 175
General and administrative                 2,836 4,427
Total operating expenses                 4,548 13,610
Loss from operations                 (3,584) (7,581)
Other income (loss), net                 194 (474)
Loss before income taxes                 (3,390) (8,055)
Income tax expense                 0 82
Net loss                 $ (3,390) $ (8,137)