Net Loss per Share (Tables)

3 Months Ended

Mar. 30, 2013

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share was as follows (in thousands):



	Three Months Ended
	March 30, 2013			March 31, 2012
Numerator:
Net loss used in computing basic and diluted net loss per share	$	(19,773	)	$	(17,454	)
Denominator:
Weighted-average shares used in computing basic net loss per share	53,664			49,487
Add potentially dilutive securities	—			—
Weighted average shares used in computing basic and diluted net loss per share	53,664			49,487

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table sets forth the weighted-average number of all potentially dilutive securities excluded from the computation in the table above because their effect would have been anti-dilutive (in thousands):



	Three Months Ended
	March 30, 2013	March 31, 2012
Options to purchase common stock	4,167	4,612
Restricted stock units	610	1,203
Employee Stock Purchase Plan	27	5
Total potentially dilutive securities	4,804	5,820