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Basic and Diluted Loss Per Share (Details 1) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2016
Jul. 03, 2015
Jul. 01, 2016
Jul. 03, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,457 2,083 3,182 1,952
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,199 1,561 2,994 1,396
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 258 137 188 211
Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 385 0 345