Identifiable intangible assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Software costs capitalized	$ 532,000	$ 965,000	$ 1,526,000	$ 1,626,000
Amortization of capitalized software costs	468,000	400,000	932,000	492,000
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	19,965,000		19,965,000		18,440,000
Less accumulated amortization	(4,301,000)		(4,301,000)		(3,369,000)
Intangible assets - net	15,664,000		15,664,000		15,071,000
Future amortization of intangible assets assuming straight-line amortization of capitalized software costs [Abstract]
2014	1,061,000		1,061,000
2015	2,268,000		2,268,000
2016	2,237,000		2,237,000
2017	2,137,000		2,137,000
2018	2,034,000		2,034,000
Thereafter	4,127,000		4,127,000
Total	13,864,000		13,864,000
Acquired and internally developed software costs [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	18,165,000		18,165,000		16,640,000
Trademarks (non-amortizable) [Member]
Components of identifiable intangible assets [Abstract]
Intangible assets - gross	$ 1,800,000		$ 1,800,000		$ 1,800,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining estimated economic life of the product			3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Remaining estimated economic life of the product			7 years