Segment and Related Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) h segment	Mar. 31, 2017 USD ($)
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	$ 55,661	$ 65,865
Operating (loss) income	138	2,241
Other income (expense), net	49	(248)
Interest expense, net	(41)	(32)
Income from continuing operations before provision for income taxes	146	1,961
Depreciation, amortization and accretion	1,062	898
Capital expenditures including software costs	1,670	3,350
Operating segments | Restaurant/Retail
Information as to the Company's segments [Abstract]
Revenues	39,520	51,549
Operating (loss) income	(608)	2,362
Depreciation, amortization and accretion	908	774
Capital expenditures including software costs	1,139	1,075
Operating segments | Government
Information as to the Company's segments [Abstract]
Revenues	16,141	14,316
Operating (loss) income	1,266	1,511
Depreciation, amortization and accretion	5	7
Capital expenditures including software costs	0	0
Other
Information as to the Company's segments [Abstract]
Operating (loss) income	(520)	(1,632)
Depreciation, amortization and accretion	149	117
Capital expenditures including software costs	531	2,275
Reportable geographical components | United States
Information as to the Company's segments [Abstract]
Revenues	52,678	61,567
Reportable geographical components | Other Countries
Information as to the Company's segments [Abstract]
Revenues	$ 2,983	$ 4,298