Segment and Related Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment h	Sep. 30, 2018 USD ($)
Segment and Related Information [Abstract]
Number of reportable segments | segment			2
Number of hours of telephone support for restaurant and retail segment | h			24
Information as to the Company's segments [Abstract]
Revenue	$ 45,380	$ 46,362	$ 134,309	$ 154,594
Operating loss	(3,991)	(2,662)	(9,545)	(3,648)
Other (expense) income, net	(401)	455	(1,205)	120
Interest expense, net	(1,588)	(142)	(2,978)	(261)
Loss before benefit from (provision for) income taxes	(5,980)	(2,349)	(13,728)	(3,789)
Depreciation, amortization and accretion	1,872	1,378	4,993	3,491
Capital expenditures including software costs	1,318	2,232	4,635	6,067
Operating segments | Restaurant/Retail
Information as to the Company's segments [Abstract]
Revenue	29,841	28,926	87,663	103,273
Operating loss	(4,432)	(3,836)	(12,029)	(7,244)
Depreciation, amortization and accretion	824	1,215	2,893	3,014
Capital expenditures including software costs	838	1,098	2,679	3,363
Operating segments | Government
Information as to the Company's segments [Abstract]
Revenue	15,539	17,436	46,646	51,321
Operating loss	809	1,854	3,690	5,132
Depreciation, amortization and accretion	17	6	54	17
Capital expenditures including software costs	0	67	176	104
Other
Information as to the Company's segments [Abstract]
Operating loss	(368)	(680)	(1,206)	(1,536)
Depreciation, amortization and accretion	1,031	157	2,046	460
Capital expenditures including software costs	480	1,067	1,780	2,600
Reportable geographical components | United States
Information as to the Company's segments [Abstract]
Revenue	44,380	43,183	127,962	144,706
Reportable geographical components | Other Countries
Information as to the Company's segments [Abstract]
Revenue	$ 1,000	$ 3,179	$ 6,347	$ 9,888