Revenue Recognition (Schedule of Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	$ 6,867	$ 4,280	$ 20,800	$ 15,609
North and South America [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	2,947	2,192	11,264	9,479
Europe, Middle East, and Africa [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	2,444	1,634	7,131	4,378
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	$ 1,476	$ 454	$ 2,405	$ 1,752
Customer Concentration Risk [Member] | Revenues [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk [Member] | Revenues [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	35.00%	22.00%	24.00%	29.00%
Customer Concentration Risk [Member] | Revenues [Member] | Military [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	46.00%	45.00%	53.00%	50.00%
Customer Concentration Risk [Member] | Revenues [Member] | Commercial and Military [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage	19.00%	33.00%	23.00%	21.00%