The Company and Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Cost method investment	$ 105	$ 1,322
Goodwill impairment charges	$ 0	74,196	$ 0
Standard Warranty Replacement of a Defective Product, Period	1 year
Shipping, Handling and Transportation Costs	$ 10,400	10,500	11,600
Marketing and Advertising Expense	19,400	19,100	18,000
Foreign Currency Transaction Gain (loss), net	(5,114)	(5,642)	(1,592)
Intangibles Impairment charges	0	0	2,000
Impairment of Intangible Assets (Excluding Goodwill)	0	0
Service Provider [Member]
Significant Accounting Policies [Line Items]
Goodwill impairment charges	$ 0	$ 74,196
Minimum [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Accounts Receivable [Member] | Best Buy Inc [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	37.00%	21.00%
Sierra Wireless AirCard Business [Member]
Significant Accounting Policies [Line Items]
Intangibles Impairment charges			$ 2,000