Segment Information (Sales By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 3,541	$ 3,032	$ 9,431	$ 9,345
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	3,541	3,032	9,431	9,345
United States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	2,354	2,244	6,783	7,034
Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	1,134	771	2,577	2,253
Other Countries [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 53	$ 17	$ 71	$ 58