Discontinued Operations - Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Operating expenses:
Gain on sale of discontinued operations									$ 0	$ (19)
Net income (loss) from discontinued operations	$ 0	$ 0	$ 266	$ 0	$ (680)	$ (239)	$ 0	$ 5,494	266	4,575
Medical Device Sales And Service Post-Warranty Service Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues									0	789
Total cost of revenues									0	555
Gross profit									0	234
Operating expenses:
Marketing and sales									0	85
General and administrative									0	163
Amortization of intangible assets									0	13
Gain on sale of discontinued operations									(350)	(6,161)
Total operating expenses									(350)	(5,900)
Income from operations									350	6,134
Interest expense, net									0	(26)
Income from discontinued operations before income taxes									350	6,108
Income tax expense									(84)	(1,533)
Net income (loss) from discontinued operations									$ 266	$ 4,575