Balance Sheet Components (Schedule Of Intangibles, Net) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Cost	$ 44,570	$ 44,570
Accumulated Amortization	(24,593)	(23,614)
Net	19,977	20,956
Existing Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	14,000	14,000
Accumulated Amortization	(12,619)	(12,548)
Net	1,381	1,452
Core Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	10,800	10,800
Accumulated Amortization	(7,633)	(7,357)
Net	3,167	3,443
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,600	2,600
Accumulated Amortization	(2,130)	(2,021)
Net	470	579
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,270	1,270
Accumulated Amortization	(212)	(180)
Net	1,058	1,090
Non-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	100	100
Accumulated Amortization	(100)	(100)
Net	0	0
Customer Contracts And Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	15,700	15,700
Accumulated Amortization	(1,799)	(1,308)
Net	13,901	14,392
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	100	100
Accumulated Amortization	(100)	(100)
Net	$ 0	$ 0