Discontinued Operations (Summary Of Results Of Discontinued Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of taxes	$ (597)	$ (1,215)	$ (1,170)
Cardiac Diagnostic Monitoring Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, net			140
Operating costs and expenses			(268)
Loss from discontinued operations, net of taxes			(128)
UK Subsidiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, net	1,068	2,514	3,683
Cost of goods sold	667	1,582	2,206
Gross profit	401	932	1,477
Sales and marketing	314	902	1,185
General and administrative	684	1,291	1,373
Total operating expenses	998	2,193	2,558
Other income, net		46	39
Loss from discontinued operations, net of taxes	$ (597)	$ (1,215)	$ (1,042)