Selected Quarterly Financial Information (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Revenue	$ 2,340	$ 3,454	$ 3,927	$ 2,837	$ 2,229	$ 3,648	$ 3,933	$ 3,535	$ 12,558	$ 13,345
Gross profit	420	787	913	616	211	899	1,061	853	2,736	3,024
Loss from operations	(734)	(334)	(282)	(477)	(741)	(163)	(35)	(174)	(1,827)	(1,113)
Net loss	$ (822)	$ (425)	$ (363)	$ (469)	$ (808)	$ (211)	$ (55)	$ (197)	$ (2,079)	$ (1,271)
Basic and diluted loss per share	$ (0.02)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.01)	$ 0.00	$ 0.00	$ (0.05)	$ (0.03)

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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