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Stockholders' Equity - Issuance of Common Stock and Warrants (Details) - USD ($)
 1 Months Ended
Nov. 30, 2013
Sep. 27, 2015
Dec. 28, 2014
Jul. 31, 2013
Class of Stock [Line Items]        
Offerings       $ 40,000,000.0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001  
Underwritten public offering price (in dollars per share) $ 2.90 $ 1.65    
Net proceeds from offering $ 23,100,000      
Offering expenses $ 2,200,000      
Warrants outstanding (in warrants)   2,300,000    
November 2009 Financing        
Class of Stock [Line Items]        
Warrants outstanding (in warrants)   1,900,000    
Strike price of warrants (in dollars per unit)   $ 2.15    
June 2012 Financing        
Class of Stock [Line Items]        
Warrants outstanding (in warrants)   2,300,000    
Strike price of warrants (in dollars per unit)   $ 2.98    
Common Stock        
Class of Stock [Line Items]        
Aggregate shares of common stock issued (in shares) 8,740,000