Net Income (Loss) Per Share (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Numerators and denominators of the basic and diluted net income (loss) per share computations
Net income (loss) (numerator)	$ 17	$ 390	$ (7,511)	$ 906
Shares calculation (denominator):
Weighted average shares outstanding - basic	117,056	114,939	117,162	114,387
Effect of Dilutive Securities:
Potential common stock relating to stock options, restricted stock units and ESPP	437	1,359		1,756
Weighted average shares outstanding - diluted	117,493	116,298	117,162	116,143
Net income (loss) per share - basic	$ 0.00	$ 0.00	$ (0.06)	$ 0.01
Net income (loss) per share - diluted	$ 0.00	$ 0.00	$ (0.06)	$ 0.01