Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 282,876	$ 213,786	$ 187,232
Service
Disaggregation of Revenue [Line Items]
Revenue	105,337	69,284	56,978
Product
Disaggregation of Revenue [Line Items]
Revenue	105,014	73,228	66,329
Restaurant/Retail | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	123,180	89,220	93,857
Restaurant/Retail | Over Time
Disaggregation of Revenue [Line Items]
Revenue	87,171	53,292	29,450
Restaurant/Retail | Hardware | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	102,066	72,029	63,811
Restaurant/Retail | Hardware | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Software | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	1,131	668	3,143
Restaurant/Retail | Software | Over Time
Disaggregation of Revenue [Line Items]
Revenue	56,723	25,716	13,677
Restaurant/Retail | Service | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	19,983	16,523	26,903
Restaurant/Retail | Service | Over Time
Disaggregation of Revenue [Line Items]
Revenue	30,448	27,576	15,773
Restaurant/Retail | Mission systems | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Mission systems | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Intelligence, surveillance, and reconnaissance solutions | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Intelligence, surveillance, and reconnaissance solutions | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Product | Point in Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Product | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Restaurant/Retail | Hardware, Software, and Service
Disaggregation of Revenue [Line Items]
Revenue		142,500	123,300
Government | Over Time
Disaggregation of Revenue [Line Items]
Revenue	72,525	71,274	63,925
Government | Hardware | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Government | Software | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Government | Service | Over Time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0
Government | Mission systems | Over Time
Disaggregation of Revenue [Line Items]
Revenue	38,311	37,448	29,541
Government | Intelligence, surveillance, and reconnaissance solutions | Over Time
Disaggregation of Revenue [Line Items]
Revenue	33,188	32,947	33,513
Government | Product | Over Time
Disaggregation of Revenue [Line Items]
Revenue	$ 1,026	$ 879	$ 871