Revenue Recognition - Schedule of Disaggregated Revenue (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Point in Time | Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	$ 32,917
Point in Time | Restaurant/Retail | Restaurant
Disaggregation of Revenue [Line Items]
Revenue	32,164,000
Point in Time | Restaurant/Retail | Grocery
Disaggregation of Revenue [Line Items]
Revenue	753
Point in Time | Restaurant/Retail | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	0
Point in Time | Restaurant/Retail | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue	0
Over Time | Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	6,603
Over Time | Restaurant/Retail | Restaurant
Disaggregation of Revenue [Line Items]
Revenue	5,857
Over Time | Restaurant/Retail | Grocery
Disaggregation of Revenue [Line Items]
Revenue	746
Over Time | Restaurant/Retail | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue
Over Time | Restaurant/Retail | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue
Over Time | Government
Disaggregation of Revenue [Line Items]
Revenue	16,141,000
Over Time | Government | Restaurant
Disaggregation of Revenue [Line Items]
Revenue
Over Time | Government | Grocery
Disaggregation of Revenue [Line Items]
Revenue
Over Time | Government | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	8,334,000
Over Time | Government | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue	$ 7,807,000