Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 77,860	$ 54,847	$ 201,277	$ 155,270
Service
Disaggregation of Revenue [Line Items]
Revenue	29,530	16,877	74,743	50,952
Product
Disaggregation of Revenue [Line Items]
Revenue	30,291	20,470	72,786	51,437
Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	59,821	37,347	147,529	102,389
Government
Disaggregation of Revenue [Line Items]
Revenue	18,039	17,500	53,748	52,881
Point in Time | Restaurant/Retail
Disaggregation of Revenue [Line Items]
Revenue	35,109	24,010	85,709	62,549
Point in Time | Restaurant/Retail | Hardware
Disaggregation of Revenue [Line Items]
Revenue	29,669	20,149	70,858	50,390
Point in Time | Restaurant/Retail | Software
Disaggregation of Revenue [Line Items]
Revenue	290	371	827	1,153
Point in Time | Restaurant/Retail | Service
Disaggregation of Revenue [Line Items]
Revenue	5,150	3,490	14,024	11,006
Point in Time | Restaurant/Retail | Mission systems
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Point in Time | Restaurant/Retail | Intelligence, surveillance, and reconnaissance 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	24,712	13,337	61,820	39,840
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	16,878	6,418	39,318	18,547
Over Time | Restaurant/Retail | Service
Disaggregation of Revenue [Line Items]
Revenue	7,834	6,919	22,502	21,293
Over Time | Restaurant/Retail | Mission systems
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Over Time | Restaurant/Retail | Intelligence, surveillance, and reconnaissance 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	18,039	17,500	53,748	52,881
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	9,619	8,084	28,450	24,620
Over Time | Government | Intelligence, surveillance, and reconnaissance solutions
Disaggregation of Revenue [Line Items]
Revenue	8,237	8,943	24,706	27,457
Over Time | Government | Product
Disaggregation of Revenue [Line Items]
Revenue	$ 183	$ 473	$ 592	$ 804