Revenue Recognition (Schedule of Disaggregated Revenue) (Details) - USD ($) $ 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
Disaggregation of Revenue [Line Items]
Revenues from contract with customer	$ 5,435	$ 6,867	$ 7,066	$ 6,867	$ 6,422	$ 4,280	$ 5,260	$ 6,069	$ 26,235	$ 22,031
North and South America [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer									13,969	11,834
Europe, Middle East, and Africa [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer									9,157	7,299
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenues from contract with customer									$ 3,109	$ 2,898
Customer Concentration Risk [Member] | Revenues [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									100.00%	100.00%
Customer Concentration Risk [Member] | Revenues [Member] | Military [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									75.00%	64.00%
Customer Concentration Risk [Member] | Revenues [Member] | Commercial, including Industrial and Medical [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									10.00%	11.00%
Customer Concentration Risk [Member] | Revenues [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									6.00%	14.00%
Customer Concentration Risk [Member] | Revenues [Member] | Multiple [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									9.00%	11.00%