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Segment and Related Information - Reconciliation of Segment Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | $ 102,796 | $ 114,624
Goodwill by business segment [Abstract] |  |
Goodwill | 11,051 | 11,051
Restaurant/Retail |  |
Goodwill by business segment [Abstract] |  |
Goodwill | 10,300 | 10,300
Government |  |
Goodwill by business segment [Abstract] |  |
Goodwill | 800 | 800
Operating segments | Restaurant/Retail |  |
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | 75,132 | 74,257
Goodwill by business segment [Abstract] |  |
Goodwill | 10,315 | 10,315
Operating segments | Government |  |
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | 9,518 | 8,714
Goodwill by business segment [Abstract] |  |
Goodwill | 736 | 736
Reportable geographical components | United States |  |
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | 90,970 | 99,284
Reportable geographical components | Other Countries |  |
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | 11,826 | 15,340
Other |  |
Identifiable assets by geographic area [Abstract] |  |
Identifiable assets | $ 18,146 | $ 31,653

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