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Segment Information (Narrative) (Details) - business_unit
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of reportable segments (in segments) 3    
Arlo and Connected Home [Member] | Net Revenue [Member] | Customer A [Member]      
Concentration Risk, Percentage 19.00% 17.00% 15.00%
Arlo and Connected Home [Member] | Net Revenue [Member] | Customer B [Member]      
Concentration Risk, Percentage 14.00% 12.00%