Selected Balance Sheet Accounts (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Intangible Assets
Intangible assets, gross	$ 14,468	$ 14,468
Accumulated amortization	(10,676)	(10,295)
Intangible assets, net	3,791	4,173
Trademarks and Trade Names [Member]
Intangible Assets
Intangible assets, gross	6,574	6,574
Accumulated amortization	(5,692)	(5,594)
Intangible assets, net	882	980
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	5 years
Software and publications [Member]
Intangible Assets
Intangible assets, gross	1,300	1,300
Accumulated amortization	(1,300)	(1,300)
Intangible assets, net
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	3 years
Customer Relationships [Member]
Intangible Assets
Intangible assets, gross	5,074	5,074
Accumulated amortization	(2,898)	(2,696)
Intangible assets, net	2,176	2,378
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	2 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	5 years
Noncompete Agreements [Member]
Intangible Assets
Intangible assets, gross	700	700
Accumulated amortization	(541)	(500)
Intangible assets, net	159	200
Developed Technology [Member]
Intangible Assets
Intangible assets, gross	820	820
Accumulated amortization	(246)	(205)
Intangible assets, net	$ 574	$ 615
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	5 years
Employment/non-compete agreements [Member]
Finite-Lived Intangible Assets
Estimated Useful Life (in years)	5 years