Discontinued Operations - Income From Discontinued Operations, Net of Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of taxes	$ (168)	$ 132	$ (168)	$ (147)
ALG Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	0	4,131	0	8,740
Cost of revenue (exclusive of depreciation and amortization presented separately below)	0	1,295	0	2,341
Sales and marketing	0	444	0	939
Technology and development	0	303	0	620
General and administrative	168	671	168	895
Depreciation and amortization	0	1,250	0	2,492
Goodwill impairment	0	0	0	1,923
Total costs and operating expenses	168	3,963	168	9,210
(Loss) income from operations	(168)	168	(168)	(470)
Interest income	0	11	0	166
(Loss) income from discontinued operations before income taxes	(168)	179	(168)	(304)
Provision (benefit) from income taxes	0	47	0	(157)
(Loss) income from discontinued operations, net of taxes	$ (168)	$ 132	$ (168)	$ (147)

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