Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	$ 43,224		$ 43,224		$ 42,643
Accumulated Amortization	[1]	(19,463)		(19,463)		(18,029)
Intangible assets, net		23,761		23,761		24,614
Finite-lived intangible assets, fully amortized, gross		8,500		8,500		7,900
Amortization expense		1,049	$ 1,034	2,088	$ 2,057
Cost of Sales [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense		34	37	69	74
Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense		1,015	$ 997	2,019	$ 1,983
Distribution rights
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	320		320		347
Accumulated Amortization	[1]	(84)		(84)		(76)
Intangible assets, net		236		236		271
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	10,708		10,708		10,107
Accumulated Amortization	[1]	(4,605)		(4,605)		(4,736)
Intangible assets, net		6,103		6,103		5,371
Trademarks and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	2,001		2,001		2,001
Accumulated Amortization	[1]	(934)		(934)		(834)
Intangible assets, net		1,067		1,067		1,167
Developed and core technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	3,507		3,507		3,506
Accumulated Amortization	[1]	(1,491)		(1,491)		(1,373)
Intangible assets, net		2,016		2,016		2,133
Capitalized software development costs
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	276		276		276
Accumulated Amortization	[1]	(153)		(153)		(85)
Intangible assets, net		123		123		191
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	26,412		26,412		26,406
Accumulated Amortization	[1]	(12,196)		(12,196)		(10,925)
Intangible assets, net		$ 14,216		$ 14,216		$ 15,481

[1] This table excludes the gross value of fully amortized intangible assets totaling $8.5 million and $7.9 million on June 30, 2015 and December 31, 2014, respectively.