Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 68,950	$ 45,691	$ 123,417	$ 100,423
Service
Disaggregation of Revenue [Line Items]
Revenue	27,185	15,300	45,213	34,075
Product
Disaggregation of Revenue [Line Items]
Revenue	23,939	12,333	42,495	30,967
Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	51,124	27,633	87,708	65,042
Government
Disaggregation of Revenue [Line Items]
Revenue	17,826	18,058	35,709	35,381
Point in Time | Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	29,111	14,898	50,601	38,539
Point in Time | Restaurant/Retail | Hardware
Disaggregation of Revenue [Line Items]
Revenue	23,355	12,104	41,190	30,241
Point in Time | Restaurant/Retail | Software
Disaggregation of Revenue [Line Items]
Revenue	294	624	537	1,186
Point in Time | Restaurant/Retail | Service
Disaggregation of Revenue [Line Items]
Revenue	5,462	2,170	8,874	7,112
Point in Time | Restaurant/Retail | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Point in Time | Restaurant/Retail | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Point in Time | Restaurant/Retail | Product
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Over Time | Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	22,013	12,735	37,107	26,503
Over Time | Restaurant/Retail | Hardware
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Restaurant/Retail | Software
Disaggregation of Revenue [Line Items]
Revenue	14,806	7,232	22,439	14,618
Over Time | Restaurant/Retail | Service
Disaggregation of Revenue [Line Items]
Revenue	7,207	5,503	14,668	11,885
Over Time | Restaurant/Retail | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Restaurant/Retail | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Restaurant/Retail | Product
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Over Time | Government
Disaggregation of Revenue [Line Items]
Revenue	17,826	18,058	35,709	35,381
Over Time | Government | Hardware
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Government | Software
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Government | Service
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Government | Mission Systems
Disaggregation of Revenue [Line Items]
Revenue	9,284	8,087	18,831	16,535
Over Time | Government | ISR Solutions
Disaggregation of Revenue [Line Items]
Revenue	8,338	9,742	16,469	18,514
Over Time | Government | Product
Disaggregation of Revenue [Line Items]
Revenue	$ 204	$ 229	$ 409	$ 332