Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Schedule of components of intangible assets
Gross	$ 41,986,000			$ 41,986,000			$ 42,530,000
Accumulated Amortization	(13,674,000)			(13,674,000)			(12,695,000)
Intangible assets, net	28,312,000			28,312,000			29,835,000
Finite-Lived Intangible Assets, Fully Amortized, Gross	6,300,000			6,300,000			9,100,000
Amortization expense	1,024,000		1,038,000	2,088,000		2,077,000
Distribution Rights [Member]
Schedule of components of intangible assets
Gross	373,000	[1]		373,000	[1]		378,000	[1]
Accumulated Amortization	(50,000)	[1]		(50,000)	[1]		(50,000)	[1]
Intangible assets, net	323,000	[1]		323,000	[1]		328,000	[1]
Patents [Member]
Schedule of components of intangible assets
Gross	8,541,000	[1]		8,541,000	[1]		8,113,000	[1]
Accumulated Amortization	(4,097,000)	[1]		(4,097,000)	[1]		(3,847,000)	[1]
Intangible assets, net	4,444,000	[1]		4,444,000	[1]		4,266,000	[1]
Number of Disposed Intangible Assets				3		11
Trademarks [Member]
Schedule of components of intangible assets
Number of Disposed Intangible Assets				1
Trademarks and Trade Names [Member]
Schedule of components of intangible assets
Gross	2,840,000	[1]		2,840,000	[1]		2,841,000	[1]
Accumulated Amortization	(1,268,000)	[1]		(1,268,000)	[1]		(1,127,000)	[1]
Intangible assets, net	1,572,000	[1]		1,572,000	[1]		1,714,000	[1]
Developed and Core Technology [Member]
Schedule of components of intangible assets
Gross	3,505,000	[1]		3,505,000	[1]		3,507,000	[1]
Accumulated Amortization	(1,022,000)	[1]		(1,022,000)	[1]		(906,000)	[1]
Intangible assets, net	2,483,000	[1]		2,483,000	[1]		2,601,000	[1]
Capitalized Software Development Costs [Member]
Schedule of components of intangible assets
Gross	327,000	[1]		327,000	[1]		1,276,000	[1]
Accumulated Amortization	(119,000)	[1]		(119,000)	[1]		(913,000)	[1]
Intangible assets, net	208,000	[1]		208,000	[1]		363,000	[1]
Customer Relationships [Member]
Schedule of components of intangible assets
Gross	26,400,000	[1]		26,400,000	[1]		26,415,000	[1]
Accumulated Amortization	(7,118,000)	[1]		(7,118,000)	[1]		(5,852,000)	[1]
Intangible assets, net	19,282,000	[1]		19,282,000	[1]		20,563,000	[1]
Cost of Sales [Member]
Schedule of components of intangible assets
Amortization expense	51,000		76,000	143,000		157,000
Selling, General and Administrative Expenses [Member]
Schedule of components of intangible assets
Amortization expense	$ 973,000		$ 962,000	$ 1,945,000		$ 1,920,000

[1] This table excludes the gross value of fully amortized intangible assets totaling $6.3 million and $9.1 million on June 30, 2013 and December 31, 2012, respectively.