Segment and Related Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) h segment	Sep. 30, 2017 USD ($)
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]
Revenues	$ 46,362	$ 48,938	$ 154,594	$ 177,064
Operating (loss) income	(2,662)	(2,596)	(3,648)	2,399
Other income (expense), net	455	(70)	120	(264)
Interest expense, net	(142)	(39)	(261)	(84)
(Loss) income from continuing operations before benefit from / (provision for) income taxes	(2,349)	(2,705)	(3,789)	2,051
Depreciation, amortization and accretion	1,378	953	3,491	2,805
Capital expenditures including software costs	2,232	1,578	6,067	7,223
Operating segments | Restaurant/Retail
Information as to the Company's segments [Abstract]
Revenues	28,926	34,023	103,273	133,288
Operating (loss) income	(3,836)	(3,559)	(7,244)	603
Depreciation, amortization and accretion	1,215	886	3,014	2,481
Capital expenditures including software costs	1,098	1,121	3,363	3,452
Operating segments | Government
Information as to the Company's segments [Abstract]
Revenues	17,436	14,915	51,321	43,776
Operating (loss) income	1,854	1,267	5,132	4,364
Depreciation, amortization and accretion	6	5	17	16
Capital expenditures including software costs	67	0	104	7
Other
Information as to the Company's segments [Abstract]
Operating (loss) income	(680)	(304)	(1,536)	(2,568)
Depreciation, amortization and accretion	157	62	460	308
Capital expenditures including software costs	1,067	457	2,600	3,764
Reportable geographical components | United States
Information as to the Company's segments [Abstract]
Revenues	43,183	44,418	144,706	163,606
Reportable geographical components | Other Countries
Information as to the Company's segments [Abstract]
Revenues	$ 3,179	$ 4,520	$ 9,888	$ 13,458