Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended
		Aug. 31, 2015	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		$ 54,299			$ 54,299			$ 42,643
Accumulated Amortization	[1]		(20,347)			(20,347)			(18,029)
Intangible assets, net			33,952			33,952			24,614
Finite-lived intangible assets, fully amortized, gross			8,800			8,800			7,900
Amortization expense			1,218		$ 1,063	3,306		$ 3,120
Cost of sales
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense			31		37	100		111
Selling, general and administrative
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense			1,187		$ 1,026	3,206		$ 3,009
Distribution rights
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		320			320			347
Accumulated Amortization	[1]		(91)			(91)			(76)
Intangible assets, net			229			229			271
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		11,090			11,090			10,107
Accumulated Amortization	[1]		(4,641)			(4,641)			(4,736)
Intangible assets, net			6,449			6,449			5,371
Trademarks and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		2,402	[2]		2,402	[2]		2,001
Accumulated Amortization	[1]		(989)	[2]		(989)	[2]		(834)
Intangible assets, net			1,413			1,413			1,167
Developed technology and core technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		12,588	[2]		12,588	[2]		3,506
Accumulated Amortization	[1]		(1,682)	[2]		(1,682)	[2]		(1,373)
Intangible assets, net			10,906			10,906			2,133
Capitalized software development costs
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		181			181			276
Accumulated Amortization	[1]		(89)			(89)			(85)
Intangible assets, net			92			92			191
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]		27,718	[2]		27,718	[2]		26,406
Accumulated Amortization	[1]		(12,855)	[2]		(12,855)	[2]		(10,925)
Intangible assets, net			14,863			14,863			$ 15,481
Ecolink | Trade name
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		$ 400	400			400
Intangible asset, useful life		7 years
Ecolink | Developed technology and core technology
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		$ 9,080	9,080			9,080
Intangible assets, weighted average useful life		5 years
Ecolink | Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		$ 1,300	$ 1,300			$ 1,300
Intangible asset, useful life		5 years

[1] This table excludes the gross value of fully amortized intangible assets totaling $8.8 million and $7.9 million at September 30, 2015 and December 31, 2014, respectively.

[2] During the third quarter of 2015, we purchased a trade name valued at $0.4 million, which is being amortized ratably over seven years; developed technology valued at $9.1 million, which is being amortized over a weighted average period of approximately five years; and customer relationships valued at $1.3 million, which are being amortized ratably over five years. Refer to Note 18 for further information regarding our purchase of these intangible assets.