Shelf Registration Statement (Details) (USD $)	1 Months Ended		12 Months Ended
	Nov. 30, 2013	Jun. 30, 2012	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012	Jul. 31, 2013	Jun. 02, 2012	May 31, 2012
Shelf registration maximum offering						$ 40,000,000
Shares issued in aggregate	8,740,000	5,122,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001	$ 0.001
Share Price (in dollars per share)	$ 2.90		$ 3.86
Proceeds from offering	23,100,000	11,900,000
Stock issuance cost	2,200,000	929,000	2,219,000	0	0
Increase in maximum amount of securities able to be sold under shelf registration statement							$ 3,400,000	$ 3,400,000
Common stock and warrant		2,304,900
Warrant [Member]
Class of warrant or right number of securities called by warrants or rights per unit		0.45
Price (in dollars per unit)		2.50
Exercise price of warrants (in dollars per unit)			2.98
Fair value grant date (in dollars per unit)			0.97
Risk free interest rate			0.89%
Exercise period of warrants			60 months
Expected term			5 years
Expected volatility rate			62.18%