Business Combination - Additional Disclosures (Details) - USD ($) $ in Thousands			12 Months Ended
	Apr. 21, 2016	Aug. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Decrease in earnout contingent consideration			$ 1,300
Long-term contingent consideration			10,500	$ 11,751
Other Nonoperating Income (Expense) [Member]
Business Acquisition [Line Items]
Deconsolidation gain	$ 65
Ecolink Intelligent Technology, Inc.
Business Acquisition [Line Items]
Purchase price		$ 24,100
Cash consideration		12,949
Contingent consideration		11,200
Acquisition costs		200
Fair value of noncontrolling interest		$ 378
Net sales since acquisition date			4,800	1,600
Net loss since acquisition date			$ 1,300	1,000
Period of recognition for earnout payments to acquiree (in years)		5 years
Pro forma information, increase (decrease) in amortization expense, net				$ 1,300	$ 2,300
Ecolink Intelligent Technology, Inc. | Income Approach Valuation Technique
Business Acquisition [Line Items]
Fair value inputs, discount rate		15.50%
Ecolink Intelligent Technology, Inc. | Encore Controls LLC | Variable Interest Entity, Primary Beneficiary
Business Acquisition [Line Items]
Acquired ownership interest of Acquiree's subsidiary (percentage)		50.00%
Aggregated fair value of net assets acquired		$ 700
Fair value of noncontrolling interest		$ 400