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Segment Reporting - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of income from continuing operations from segments to consolidated [Abstract]
Total consolidated operating loss	$ (7,901)	$ 851	$ 2,390	$ 2,230	$ 1,529	$ (121)	$ (2,361)	$ (1,648)	$ (2,430)	$ (2,601)	$ (1,342)
Other income, net									8,665	3,187	3,280
Income from continuing operations before income taxes									$ 6,235	$ 586	$ 1,938

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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