Revenue Recognition - Schedule of Performance Obligations (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Number of reportable segments | segment		2
Revenue recognized included in contract liabilities at beginning of period	$ 2,100	$ 8,600
Current - under one year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	$ 10,814	$ 10,814
Performance obligation, percentage	72.00%	72.00%
Performance obligations	$ 10,814	$ 10,814
Current - under one year | Restaurant/Retail
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	10,814	10,814
Performance obligations	10,814	10,814
Current - under one year | Government
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	0	0
Performance obligations	0	0
Non-current - over one year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	$ 4,148	$ 4,148
Performance obligations, period	60 months	60 months
Performance obligations	$ 4,148	$ 4,148
Non-current - over one year | Restaurant/Retail
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	4,148	4,148
Performance obligations	4,148	4,148
Non-current - over one year | Government
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	0	0
Performance obligations	0	0
Point in Time | Current - under one year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			$ 9,645
Performance obligations			9,645
Point in Time | Current - under one year | Restaurant/Retail
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			9,320
Performance obligations			9,320
Point in Time | Current - under one year | Government
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			325
Performance obligations			325
Point in Time | Non-current - over one year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			4,407
Performance obligations			4,407
Point in Time | Non-current - over one year | Restaurant/Retail
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			4,407
Performance obligations			4,407
Point in Time | Non-current - over one year | Government
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations			0
Performance obligations			0
Over Time | Government
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	202,000	202,000	139,000
Performance obligations	202,000	202,000	139,000
Funded performance obligations	$ 59,100	$ 59,100	$ 30,200