Basis of Presentation; Schedule of Remaining Performance Obligations Expected to be Recognized (Details)	Dec. 31, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations related to engineering only paid contracts	$ 6,997,000
Remaining performance obligations related to partial equipment paid contracts	1,532,000
Total remaining performance obligations	8,529,000
2019 [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations related to engineering only paid contracts	4,164,000
Remaining performance obligations related to partial equipment paid contracts	1,141,000
Total remaining performance obligations	5,305,000
2020 [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations related to engineering only paid contracts	198,000
Remaining performance obligations related to partial equipment paid contracts	391,000
Total remaining performance obligations	589,000
2021 [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations related to engineering only paid contracts	2,635,000
Remaining performance obligations related to partial equipment paid contracts
Total remaining performance obligations	$ 2,635,000