Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Performance Obligations

The aggregate uncompleted performance obligations attributable to each of the Company's reporting segments is as follows (in thousands):

	December 31, 2020				December 31, 2019
	Current under one year		Non-current over one year		Current under one year		Non-current over one year
Restaurant/Retail	$	9,506	$	3,082	$	12,084	$	3,916
Government	—		—		—		—
TOTAL	$	9,506	$	3,082	$	12,084	$	3,916

The changes in deferred revenue, inclusive of both current and long-term, are as follows:

(in thousands)	2020		2019
Beginning balance - January 1	$	12,486	$	12,813
Recognition of deferred revenue	(11,005)		(7,800)
Deferral of revenue	9,601		7,473
Ending balance - December 31	$	11,082	$	12,486

Schedule of Disaggregated Revenue

Disaggregated revenue is as follows (in thousands):

	Year Ended December 31, 2020
	Restaurant/Retail Point in Time		Restaurant/Retail Over Time		Government Over Time
Restaurant	$	73,228	$	69,284	$	—
ISR Solutions	—		—		38,327
Mission Systems	—		—		32,947
TOTAL	$	73,228	$	69,284	$	71,274

	Year Ended December 31, 2019
	Restaurant/Retail Point in Time		Restaurant/Retail Over Time		Government Over Time
Restaurant	$	92,702	$	27,224	$	—
Grocery	1,155		2,226		—
ISR Solutions	—		—		30,413
Mission Systems	—		—		33,512
TOTAL	$	93,857	$	29,450	$	63,925

	Year Ended December 31, 2018
	Restaurant/Retail Point in Time		Restaurant/Retail Over Time		Government Over Time
Restaurant	$	98,353	$	29,713	$	—
Grocery	2,907		3,096		—
ISR Solutions	—		—		32,381
Mission Systems	—		—		34,796
TOTAL	$	101,260	$	32,809	$	67,177