Segment and Related Information - Reconciliation of Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Identifiable assets by geographic area [Abstract]
Identifiable assets	$ 152,569	$ 94,681
Goodwill by business segment [Abstract]
Goodwill	13,418	11,051
Restaurant/Retail
Goodwill by business segment [Abstract]
Goodwill	13,400	13,400
Government
Goodwill by business segment [Abstract]
Goodwill	11,100	11,100
Operating segments | Restaurant/Retail
Identifiable assets by geographic area [Abstract]
Identifiable assets	79,585	68,004
Goodwill by business segment [Abstract]
Goodwill	12,682	10,315
Operating segments | Government
Identifiable assets by geographic area [Abstract]
Identifiable assets	12,866	9,867
Goodwill by business segment [Abstract]
Goodwill	736	736
Reportable geographical components | United States
Identifiable assets by geographic area [Abstract]
Identifiable assets	143,021	84,652
Reportable geographical components | Other Countries
Identifiable assets by geographic area [Abstract]
Identifiable assets	9,548	10,029
Other
Identifiable assets by geographic area [Abstract]
Identifiable assets	$ 60,118	$ 16,810