Segment and Related Information - Summary of Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) reporting_unit	Jun. 30, 2020 USD ($)
Segment and Related Information [Abstract]
Number of operating segments | reporting_unit			2
Number of reportable segments | reporting_unit			2
Information as to the Company's segments [Abstract]
Revenue	$ 68,950	$ 45,691	$ 123,417	$ 100,423
Operating loss	(16,975)	(5,718)	(22,996)	(11,173)
Other expense – net	(341)	(139)	(392)	(764)
Interest expense, net	(4,937)	(2,111)	(7,097)	(4,083)
Loss on extinguishment of debt	0	0	0	(8,123)
Net loss	(22,253)	(7,968)	(30,485)	(24,143)
Depreciation and amortization	7,797	3,558	11,787	6,700
Capital expenditures including software costs	3,498	3,006	4,438	5,046
United States
Information as to the Company's segments [Abstract]
Revenue	64,127	44,626	114,730	97,257
Other Countries
Information as to the Company's segments [Abstract]
Revenue	4,823	1,065	8,687	3,166
Corporate, Non-Segment
Information as to the Company's segments [Abstract]
Operating loss	(2,412)	630	(339)	66
Depreciation and amortization	2,073	1,567	3,598	2,838
Capital expenditures including software costs	231	0	288	122
Restaurant/Retail
Information as to the Company's segments [Abstract]
Revenue	51,124	27,633	87,708	65,042
Restaurant/Retail | Operating segments
Information as to the Company's segments [Abstract]
Operating loss	(15,968)	(7,697)	(25,252)	(13,767)
Depreciation and amortization	5,527	1,951	7,956	3,806
Capital expenditures including software costs	2,965	2,783	3,697	4,490
Government
Information as to the Company's segments [Abstract]
Revenue	17,826	18,058	35,709	35,381
Government | Operating segments
Information as to the Company's segments [Abstract]
Operating loss	1,405	1,349	2,595	2,528
Depreciation and amortization	197	40	233	56
Capital expenditures including software costs	$ 302	$ 223	$ 453	$ 434