Stockholders' Equity (Details) (USD $)	1 Months Ended		9 Months Ended
	Nov. 30, 2013	Jun. 30, 2012	Sep. 28, 2014	Sep. 29, 2013	Dec. 29, 2013	Jul. 31, 2013
Class of Stock [Line Items]
Common stock, shares authorized			100,000,000		100,000,000
Preferred stock, shares authorized			10,000,000		10,000,000
Maximum offering						$ 40,000,000.0
Shares issued in aggregate (in shares)	8,740,000	5,122,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Closing stock price (in dollars per share)	$ 2.90		$ 3.03
Proceeds from offering	23,100,000	11,900,000
Stock issuance cost	$ 2,200,000	$ 929,000	$ 0	$ 70,000
Common stock and warrant (in shares)		2,304,900
Warrant [Member]
Class of Stock [Line Items]
Warrants (in shares)		0.45
Price (in dollars per unit)		2.50
Exercise period of warrants			60 months
Exercise price of warrants (in dollars per unit)			$ 2.98
Expected term			5 years
Fair value grant date (in dollars per unit)			0.97
Risk free interest rate			0.89%
Expected volatility rate			62.18%
Expected dividend payments			$ 0