Identifiable Intangible Assets and Goodwill (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs	$ 1,100	$ 1,100	$ 2,100	$ 2,100
Amortization of capitalized software development costs	900	400	1,700	700
Amortization of intangible assets	242	242	483	483
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	21,958		21,958		$ 19,860
Less accumulated amortization	(9,854)		(9,854)		(8,190)
Total	12,104		12,104		11,670
Total intangible assets, net	12,504		$ 12,504		12,070
Number of operating segments | segment			2
Goodwill	11,051		$ 11,051		11,051
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	1,769		1,769
2019	3,140		3,140
2020	2,640		2,640
2021	1,927		1,927
2022	534		534
Thereafter	2,094		2,094
Total	12,104		$ 12,104		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	$ 500	$ 500
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	21,768		$ 21,768		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		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		30
Restaurant/Retail
Finite-Lived Intangible Assets, Net [Abstract]
Goodwill	10,300		10,300		10,300
Government
Finite-Lived Intangible Assets, Net [Abstract]
Goodwill	800		800		800
Trademarks, trade names (non-amortizable)
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 400		$ 400		$ 400