Discontinued Operation - Summary of Amounts Included in Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating expenses:
Net income (loss)	$ (19)	$ (230)	$ (5)	$ (3,944)
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	0	0	0	970
Cost of revenues	0	0	0	6
Gross profit	0	0	0	964
Operating expenses:
Sales and marketing	0	0	0	1,712
Product development	0	0	0	0
General and administrative	17	69	29	3,413
Total operating expenses	17	69	29	5,125
Loss from operations	(17)	(69)	(29)	(4,161)
Other income (loss), net	(2)	(161)	24	217
Income (loss) before income taxes	(19)	(230)	(5)	(3,944)
Income tax expense	0	0	0	0
Net income (loss)	$ (19)	$ (230)	$ (5)	$ (3,944)

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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