Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' equity at beginning of period	$ 312.6	$ 169.9
Net loss	(24.4)	(15.6)
Foreign currency translation	(0.4)	0.1
Total comprehensive loss	(24.8)	(15.5)
Additional paid-in capital from the issuance of common stock for cash	97.0	61.1
Additional paid-in capital from the issuance of common stock for acquisition of CEI	23.8	0
Stock-based compensation	4.6	2.3
Restricted Stock Units traded for taxes	(0.2)	(0.1)
Employee stock purchase plan and restricted stock units settled in cash	(0.4)	0.9
Exercise of stock options and warrants	0	1.2
Fair value of stock options assumed in acquisitions	0	111.6
Stockholders' equity at end of period	$ 412.6	$ 331.4