Significant Changes Due To Topic 606 (Summary of the Effects of Adoption of ASC Topic 606 on the Company's Prior Year Equity Statement) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated deficit	$ (509)	$ (6,056)
Accounting Standards Update 2014-09 [Member]
Accumulated deficit		(6,056)	$ (8,114)	$ (3,171)
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Accumulated deficit		(6,831)	(8,633)	(4,046)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Accumulated deficit		$ 775	$ 519	$ 875