Goodwill and Intangible Assets, Net - Finite-Lived Intangibles (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	$ 61,052		$ 61,052		$ 55,170
Accumulated Amortization	[1]	(29,433)		(29,433)		(26,621)
Net		31,619		31,619		28,549
Finite-lived intangible assets, fully amortized, gross		5,700		5,700		10,200
Amortization expense		1,791	$ 1,555	3,391	$ 3,109
Cost of sales
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense		55	21	74	42
Selling, general and administrative expenses
Finite-Lived Intangible Assets, Net [Abstract]
Amortization expense		1,736	$ 1,534	3,317	$ 3,067
Distribution rights
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	329		329		302
Accumulated Amortization	[1]	(143)		(143)		(119)
Net		186		186		183
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	12,330		12,330		12,038
Accumulated Amortization	[1]	(4,932)		(4,932)		(4,775)
Net		7,398		7,398		7,263
Trademarks and trade names (2)
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1],[2]	2,787		2,787		2,400
Accumulated Amortization	[1],[2]	(1,442)		(1,442)		(1,310)
Net	[2]	1,345		1,345		1,090
Developed and core technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	12,563		12,563		12,585
Accumulated Amortization	[1]	(5,065)		(5,065)		(4,068)
Net		7,498		7,498		8,517
Capitalized software development costs
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	142		142		142
Accumulated Amortization	[1]	(42)		(42)		(5)
Net		100		100		137
Customer relationships (2)
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1],[2]	32,751		32,751		27,703
Accumulated Amortization	[1],[2]	(17,772)		(17,772)		(16,344)
Net	[2]	14,979		14,979		11,359
Order backlog (2)
Finite-Lived Intangible Assets, Net [Abstract]
Gross	[1]	150		150		0
Accumulated Amortization	[1]	(37)		(37)		0
Net		113		113		$ 0
Residential Control Systems, Inc | Customer relationships (2)
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		5,200		$ 5,200
Estimated lives, Finite-lived intangible asset				10 years
Residential Control Systems, Inc | Order backlog (2)
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		150		$ 150
Residential Control Systems, Inc | Trade name
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets		$ 400		$ 400
Estimated lives, Finite-lived intangible asset				8 years

[1] This table excludes the gross value of fully amortized intangible assets totaling $5.7 million and $10.2 million at June 30, 2017 and December 31, 2016, respectively.

[2] During the second quarter of 2017, we purchased a trade name valued at $0.4 million, which is being amortized ratably over eight years; customer relationships valued at $5.2 million, which are being amortized ratably over 10 years; and order backlog valued at $0.2 million, which is being amortized ratably over one year. Refer to Note 18 for further information regarding the purchase of these intangible assets.