Discontinued Operations - Disposal Groups, Including Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Service revenue		$ 167	$ 1,165	$ 1,069
Product sales		2,058	4,233	3,768
Total revenue		2,225	5,398	4,837
Cost of services, exclusive of depreciation expense shown below		87	690	961
Cost of product sales, exclusive of depreciation expense shown below		1,944	3,196	4,124
Depreciation and amortization		14		115
Other Expense (income)		(1)	91	22
Operating income (loss)		181	1,421	(385)
Adjustment to gain on sale	$ (485)
Gain on sale	8,300		8,319
Income (loss) from discontinued operations before income tax expense	(485)	181	9,740	(385)
Income tax expense (benefit)	(88)	(27)	1,907	81
Income (loss) from discontinued operations, net of income taxes	$ (397)	$ 208	$ 7,833	$ (466)
Current assets					$ 3,712
Non-current assets					1,848
Total assets					5,560
Current liabilities					1,633
Non-current liabilities					82
Total liabilities					$ 1,715