Stockholders' Equity (Tables)

6 Months Ended

Jun. 24, 2012

Equity [Abstract]

Summary of changes in stockholders' equity

A summary of the changes in stockholders’ equity is provided below (in millions):

	Six Months Ended			Six Months Ended
	June 26, 2011			June 24, 2012
Stockholders’ equity at beginning of period	$	169.9		$	312.6
Comprehensive income:
Net loss	(8.7		)	(20.2		)
Foreign currency translation	—			(0.2		)
Total comprehensive loss	(8.7		)	(20.4		)
Additional paid-in-capital from the issuance of common stock for cash	61.1			97.0
Stock-based compensation	1.4			2.3
Employee stock purchase plan and restricted stock units settled in cash	0.3			—
Exercise of stock options and warrants	1.1			—
Fair value of stock options assumed in acquisitions	1.9			—
Stockholders’ equity at end of period	$	227.0		$	391.5

Rollforward of common stock outstanding

Common stock issued by the Company for the six months ended June 26, 2011 and June 24, 2012 was as follows (in millions):

	Six Months Ended	Six Months Ended
	June 26, 2011	June 24, 2012
Shares outstanding at beginning of the period	18.6	32.4
Stock issued for employee stock purchase plan, stock options and restricted stock units exercised	0.3	0.1
Redemption of Series B Convertible Preferred Stock	0.1	—
Common stock issued for cash	4.9	20.0
Shares outstanding at end of the period	23.9	52.5