Balance Sheet Components (Narrative) (Details) (USD $)	12 Months Ended								12 Months Ended			12 Months Ended			3 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Retail [Member]	Dec. 31, 2012 Retail [Member]	Dec. 31, 2011 Retail [Member]	Dec. 31, 2013 Commercial [Member]	Dec. 31, 2012 Commercial [Member]	Dec. 31, 2011 Commercial [Member]	Dec. 31, 2013 Service Provider [Member]	Dec. 31, 2012 Service Provider [Member]	Dec. 31, 2011 Service Provider [Member]	Jun. 30, 2013 Non-Patent [Member]	Jun. 30, 2013 Patents [Member]	Jun. 30, 2013 In-Process Research and Development [Member]	Jul. 03, 2012 Avaak Inc. [Member]	Dec. 31, 2013 Sierra Wireless AirCard Business [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member]	Dec. 31, 2013 Sierra Wireless AirCard Business [Member] In-Process Research and Development [Member]	Jun. 04, 2012 Firetide, Inc. [Member]
Balance Sheet Components [Line Items]
Available-for-sale Securities, Maturity Period ( in months)				3 months	12 months
Cost method investment	$ 1,322,000	$ 1,322,000
Cost-method Investments, Other than Temporary Impairment	0	0
Depreciation	17,300,000	11,900,000	9,900,000
Acquired Finite-lived Intangible Asset, Amount															64,200,000	300,000
Acquired Indefinite-lived Intangible Asset, Amount																	9,500,000
Indefinite-lived intangible assets	100,000	1,000,000																	100,000
In Process Research and Development achieving technological feasibility																					7,400,000
Future Cost to Complete In-Process Research and Development	200,000																				200,000
Amortization expense	15,500,000	4,900,000	4,800,000
Goodwill, Acquired During Period	55,036,000	14,936,000				0	11,895,000		1,195,000	3,041,000		53,841,000	0
Goodwill, Purchase Accounting Adjustments																			500,000
Goodwill, Impairment Loss	0	0	0
Impairment charges	2,000,000	0	0																2,000,000
Goodwill	155,916,000	100,880,000	85,944,000			45,441,000	45,441,000	33,546,000	36,279,000	35,084,000	32,043,000	74,196,000	20,355,000	20,355,000				11,895,000		53,841,000		3,041,000
Cost-method Investments, Realized Gains	$ 0	$ 3,100,000