Identifiable Intangible Assets and Goodwill Components of Identifiable Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 18,893,000		$ 18,893,000		$ 19,162,000
Less accumulated amortization	(9,755,000)		(9,755,000)		(11,708,000)
Total	9,138,000		9,138,000		7,454,000
Amortization of identifiable intangible assets	241,000	$ 241,000	724,000	$ 724,000
Indefinite-lived Intangible Assets [Line Items]
Intangible assets – net	13,895,000		13,895,000		10,859,000
Acquired and internally developed software costs
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	15,103,000		15,103,000		18,972,000
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	3,760,000		$ 3,760,000		160,000
Useful life			7 years
Non-competition agreements
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	30,000		$ 30,000		30,000
Useful life			1 year
Minimum
Finite-Lived Intangible Assets, Net [Abstract]
Useful life			3 years
Minimum | Acquired and internally developed software costs
Finite-Lived Intangible Assets, Net [Abstract]
Useful life			3 years
Maximum
Finite-Lived Intangible Assets, Net [Abstract]
Useful life			5 years
Maximum | Acquired and internally developed software costs
Finite-Lived Intangible Assets, Net [Abstract]
Useful life			5 years
Internally developed software costs not meeting general release threshold
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	3,847,000		$ 3,847,000		3,005,000
Trademarks, trade names (non-amortizable)
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross	910,000		910,000		$ 400,000
3M's Drive-Thru Communications Systems
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of identifiable intangible assets	$ 0		$ 0