Shelf Registration Statement (Details) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2013	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Jul. 31, 2013
Shelf Registration Statement [Abstract]
Shelf registration maximum offering					$ 40,000,000
Proceeds from offering	23,100,000
Stock issuance cost	2,200,000	(40,000)	2,219,000	0
Issuance of common stock warrants (in shares)	8,740,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Share Price (in dollars per share)	$ 2.90	$ 3.20
Shelf registration, remaining balance	$ 14,700,000