Strategic Alliance and Investment by Elutions, Inc (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	$ 1,553	$ 0
Fair Value, Inputs, Level 1 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Fair Value, Inputs, Level 2 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Fair Value, Inputs, Level 3 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	1,553
Tracking Warrant [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	1,292
Tracking Warrant [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Tracking Warrant [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Tracking Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	1,292
Holder Redemption Option [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	261
Holder Redemption Option [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Holder Redemption Option [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	0
Holder Redemption Option [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Of Liabilities Measured On Recurring Basis [Line Items]
Derivative Liability, Current	$ 261