Discontinued Operations - Income From Discontinued Operations, Net of Taxes (Details) - 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]
Loss from discontinued operations, net of taxes	$ 0	$ (279)
ALG Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		4,609
Cost of revenue (exclusive of depreciation and amortization presented separately below)		1,046
Sales and marketing		495
Technology and development		317
General and administrative		224
Depreciation and amortization		1,242
Goodwill impairment		1,923
Total costs and operating expenses		5,247
Loss from operations		(638)
Interest income		155
Loss from discontinued operations before income taxes		(483)
Benefit from income taxes		(204)
Loss from discontinued operations, net of taxes		$ (279)

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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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