Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 42,129,000			$ 42,129,000			$ 42,530,000
Accumulated Amortization	(14,497,000)			(14,497,000)			(12,695,000)
Intangible assets, net	27,632,000			27,632,000			29,835,000
Finite-lived intangible assets, fully amortized, gross	6,500,000			6,500,000			9,100,000
Amortization expense	1,020,000		1,044,000	3,107,000		3,121,000
Cost of Sales [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense	34,000		73,000	177,000		231,000
Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense	986,000		971,000	2,930,000		2,890,000
Distribution Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	389,000	[1]		389,000	[1]		378,000	[1]
Accumulated Amortization	(52,000)	[1]		(52,000)	[1]		(50,000)	[1]
Intangible assets, net	337,000	[1]		337,000	[1]		328,000	[1]
Patents [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	8,695,000	[1]		8,695,000	[1]		8,113,000	[1]
Accumulated Amortization	(4,175,000)	[1]		(4,175,000)	[1]		(3,847,000)	[1]
Intangible assets, net	4,520,000	[1]		4,520,000	[1]		4,266,000	[1]
Number of disposed intangible assets				9		13
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	2,840,000	[1]		2,840,000	[1]		2,841,000	[1]
Accumulated Amortization	(1,339,000)	[1]		(1,339,000)	[1]		(1,127,000)	[1]
Intangible assets, net	1,501,000	[1]		1,501,000	[1]		1,714,000	[1]
Trademarks [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Number of disposed intangible assets				12
Developed and Core Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	3,505,000	[1]		3,505,000	[1]		3,507,000	[1]
Accumulated Amortization	(1,080,000)	[1]		(1,080,000)	[1]		(906,000)	[1]
Intangible assets, net	2,425,000	[1]		2,425,000	[1]		2,601,000	[1]
Software and Software Development Costs [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	297,000	[1]		297,000	[1]		1,276,000	[1]
Accumulated Amortization	(98,000)	[1]		(98,000)	[1]		(913,000)	[1]
Intangible assets, net	199,000	[1]		199,000	[1]		363,000	[1]
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	26,403,000	[1]		26,403,000	[1]		26,415,000	[1]
Accumulated Amortization	(7,753,000)	[1]		(7,753,000)	[1]		(5,852,000)	[1]
Intangible assets, net	$ 18,650,000	[1]		$ 18,650,000	[1]		$ 20,563,000	[1]

[1] This table excludes the gross value of fully amortized intangible assets totaling $6.5 million and $9.1 million on September 30, 2013 and December 31, 2012, respectively.