Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (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, Net [Abstract]
Gross	$ 42,811,000	[1]		$ 42,811,000	[1]		$ 42,338,000	[1]
Accumulated Amortization	(17,235,000)	[1]		(17,235,000)	[1]		(15,375,000)	[1]
Intangible assets, net	25,576,000			25,576,000			26,963,000
Finite-lived intangible assets, fully amortized, gross	6,700,000			6,700,000			6,600,000
Amortization expense	1,034,000		1,024,000	2,057,000		2,088,000
Cost of Sales [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense	37,000		51,000	74,000		143,000
Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense	997,000		973,000	1,983,000		1,945,000
Distribution Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	392,000	[1]		392,000	[1]		395,000	[1]
Accumulated Amortization	(52,000)	[1]		(52,000)	[1]		(52,000)	[1]
Intangible assets, net	340,000			340,000			343,000
Patents [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	9,315,000	[1]		9,315,000	[1]		8,879,000	[1]
Accumulated Amortization	(4,509,000)	[1]		(4,509,000)	[1]		(4,251,000)	[1]
Intangible assets, net	4,806,000			4,806,000			4,628,000
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	2,838,000	[1]		2,838,000	[1]		2,841,000	[1]
Accumulated Amortization	(1,549,000)	[1]		(1,549,000)	[1]		(1,411,000)	[1]
Intangible assets, net	1,289,000			1,289,000			1,430,000
Developed and Core Technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	3,508,000	[1]		3,508,000	[1]		3,506,000	[1]
Accumulated Amortization	(1,257,000)	[1]		(1,257,000)	[1]		(1,140,000)	[1]
Intangible assets, net	2,251,000			2,251,000			2,366,000
Capitalized software development costs [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	340,000	[1]		340,000	[1]		311,000	[1]
Accumulated Amortization	(207,000)	[1]		(207,000)	[1]		(133,000)	[1]
Intangible assets, net	133,000			133,000			178,000
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	26,418,000	[1]		26,418,000	[1]		26,406,000	[1]
Accumulated Amortization	(9,661,000)	[1]		(9,661,000)	[1]		(8,388,000)	[1]
Intangible assets, net	$ 16,757,000			$ 16,757,000			$ 18,018,000

[1] This table excludes the gross value of fully amortized intangible assets totaling $6.7 million and $6.6 million on June 30, 2014 and December 31, 2013, respectively.