Net Loss Per Share of Common Stock - Anti-Dilutive Securities (Details) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012		Sep. 29, 2013	Sep. 30, 2012
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	184	334	[1]	205	377	[1]
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,537	8,829	[1]	2,047	6,904	[1]
0.75% Debentures [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0			0
Debentures 475 Percent [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	8,712	[1]	8,712	8,712	[1]
Total [Member] | Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0			0

[1] As a result of the net loss per share for the three and nine months ended September 30, 2012, the inclusion of all potentially dilutive stock options, restricted stock units, and common shares under noted warrants and convertible debt would be anti-dilutive. Therefore, those stock options, restricted stock units and shares were excluded from the computation of the weighted-average shares for diluted net loss per share for such period.