Discontinued Operations - Disposal Groups, Including Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended				12 Months Ended
	Jun. 07, 2019	Dec. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Services							$ 1,165	$ 1,462
Product sales							4,233	5,708
Total revenue							5,398	7,170
Cost of services							690	1,163
Cost of product sales							3,196	5,696
Depreciation and amortization								115
Other expense (income)							91	72
Operating income							1,421	124
Gain (adjustment) on sale	$ 8,300					$ (573)	8,319
Income (loss) from discontinued operations before income tax						(573)	9,740	124
Income tax expense (benefit)						(149)	1,907	182
Income (loss) from discontinued operations		$ (424)	$ (397)	$ 7,971	$ 259	$ (424)	$ 7,833	$ (58)