Balance Sheet Components (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended					12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 30, 2014 Minimum [Member]	Mar. 30, 2014 Maximum [Member]	Mar. 30, 2014 Retail [Member]	Mar. 30, 2014 Commercial [Member]	Mar. 30, 2014 Service Provider [Member]	Dec. 31, 2013 Sierra Wireless AirCard Business [Member]	Mar. 30, 2014 Sierra Wireless AirCard Business [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	4,300,000	3,400,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	100,000		100,000							100,000
Future Cost to Complete In-Process Research and Development										200,000
Amortization expense	4,500,000	1,500,000
Goodwill, Acquired During Period	0					0	0	0
Goodwill, Purchase Accounting Adjustments									500,000
Goodwill, Impairment Loss	0	0
Impairment charges									$ 2,000,000