Annual report pursuant to Section 13 and 15(d)

Common Stock - Schedule of Common Stock (Detail)

v3.3.1.900
Common Stock - Schedule of Common Stock (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 27, 2015
Jul. 02, 2014
Dec. 31, 2014
Class of Warrant or Right [Line Items]      
Gross Proceeds   $ 24,000  
Gross Proceeds     $ 22,372
Underwriting discount and offering expense   $ 1,600 $ 531
Underwriting discount and offering expense $ 100    
Common stock [Member]      
Class of Warrant or Right [Line Items]      
Common stock shares issued in financing   5,559,866  
Gross Proceeds   $ 14,084  
Underwriting discount and offering expense   $ 885  
Series B Pre-Funded Common Stock Warrants [Member]      
Class of Warrant or Right [Line Items]      
Warrants Issued   1,340,538  
Common stock shares issued in financing   1,340,538  
Gross Proceeds   $ 3,387  
Underwriting discount and offering expense   $ 213  
Series A Warrants [Member]      
Class of Warrant or Right [Line Items]      
Warrants Issued   2,779,933  
Gross Proceeds   $ 5,261  
Underwriting discount and offering expense   $ 428  
Series B Warrants [Member]      
Class of Warrant or Right [Line Items]      
Warrants Issued   670,269  
Gross Proceeds   $ 1,268  
Underwriting discount and offering expense   $ 103