Significant Changes Due To Topic 606 (Summary of the Effects of Adoption of ASC Topic 606 on the Company's unaudited Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ 2,008	$ 313	$ 2,775	$ (342)
Inventories			(1,918)	(1,196)
Contract assets			$ (3,053)	(682)
Accounting Standards Update 2014-09 [Member]
Net income (loss)		313		(342)
Inventories				(1,196)
Contract assets				(682)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Net income (loss)		58		216
Inventories				466
Contract assets				(682)
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Net income (loss)		$ 255		(558)
Inventories				$ (1,662)