Identifiable Intangible Assets and Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs	$ 1,100	$ 1,000
Amortization of capitalized software development costs	800	300
Amortization of intangible assets	$ 241	241
Number of operating segments | segment	2
Goodwill	$ 11,051		$ 11,051
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	20,962		19,860
Less accumulated amortization	(8,944)		(8,190)
Total	12,018		11,670
Total intangible assets, net	12,418		12,070
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	2,927
2019	2,453
2020	1,953
2021	1,574
2022	533
Thereafter	2,578
Total	$ 12,018		11,670
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Brink Acquisition
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 200	$ 200
Internal use software | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Internal use software | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Acquired and internally developed software costs
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 20,772		19,670
Acquired and internally developed software costs | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	3 years
Acquired and internally developed software costs | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful life	7 years
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 160		160
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 30		30
Restaurant/Retail
Finite-Lived Intangible Assets [Line Items]
Goodwill	10,300		10,300
Government
Finite-Lived Intangible Assets [Line Items]
Goodwill	800		800
Trademarks, trade names (non-amortizable)
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 400		$ 400