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Business Combination - Additional Disclosures (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 21, 2016	Aug. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Other Income (Expense), Net [Member]
Business Combination
Deconsolidation gain	$ 65
Ecolink Intelligent Technology, Inc. [Member]
Business Combination
Initial purchase price		$ 24,100
Cash consideration		12,949
Contingent consideration		11,200	$ 11,600		$ 11,600		$ 11,800
Acquisition costs							200
Fair value of noncontrolling interest		$ 378
Net sales			900	$ 300	3,700	$ 300
Net loss			(900)	(200)	(1,500)	(200)
Period of recognition for earnout payments to acquiree (in years)		5 years
Increase (decrease) in contingent consideration			600		(200)
Pro forma information, increase (decrease) in amortization expense, net			$ (10)	$ 300	$ (100)	$ 1,300
Ecolink Intelligent Technology, Inc. [Member] | Income Approach Valuation Technique [Member]
Business Combination
Contingent consideration discount rate		15.50%
Ecolink Intelligent Technology, Inc. [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Encore Controls LLC [Member]
Business Combination
Acquired ownership interest of acquirees' subsidiary		50.00%
Aggregate fair value of net assets acquired		$ 700
Fair value of noncontrolling interest		$ 400
Ecolink Intelligent Technology, Inc. [Member] | Selling, General and Administrative Expenses [Member]
Business Combination
Acquisition costs							$ 200

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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