Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Summary of Finite-lived intangible assets
Adjusted cost	$ 32,031	$ 32,031
Accumulated amortization	(20,417)	(17,637)
Net carrying amount	11,614	14,394
Developed technology [Member]
Summary of Finite-lived intangible assets
Adjusted cost	17,881	17,881
Accumulated amortization	(8,292)	(6,254)
Net carrying amount	9,589	11,627
Customer relationships [Member]
Summary of Finite-lived intangible assets
Adjusted cost	9,561	9,561
Accumulated amortization	(8,511)	(7,961)
Net carrying amount	1,050	1,600
Brand names [Member]
Summary of Finite-lived intangible assets
Adjusted cost	1,927	1,927
Accumulated amortization	(1,574)	(1,498)
Net carrying amount	353	429
Patented technology [Member]
Summary of Finite-lived intangible assets
Adjusted cost	2,252	2,252
Accumulated amortization	(1,906)	(1,856)
Net carrying amount	346	396
In-process research and development [Member]
Summary of Finite-lived intangible assets
Adjusted cost	330	330
Accumulated amortization	(60)	0
Net carrying amount	270	330
Trademark [Member]
Summary of Finite-lived intangible assets
Adjusted cost	80	80
Accumulated amortization	(74)	(68)
Net carrying amount	$ 6	$ 12