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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock at Par Value
Additional Paid-In Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 29, 2013   53,788    
Beginning balance at Dec. 29, 2013 $ 40,598 $ 54 $ 230,373 $ (189,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued under stock plans and employee stock purchase plans (in shares)   2,358    
Common stock issued under stock plans and employee stock purchase plans 4,702 $ 2 4,700  
Adjustment of Common stock and Warrants issuance costs 40 $ 0 40  
Issuance of common stock from exercise of warrants (in shares)   36    
Issuance of common stock from exercise of warrants 0   0  
Stock-based compensation 3,306   3,306  
Net loss (13,079)     (13,079)
Ending balance (in shares) at Dec. 28, 2014   56,182    
Ending balance at Dec. 28, 2014 35,567 $ 56 238,419 (202,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued under stock plans and employee stock purchase plans (in shares)   722    
Common stock issued under stock plans and employee stock purchase plans 554 $ 1 553  
Stock-based compensation 2,052   2,052  
Net loss (17,848)     (17,848)
Ending balance (in shares) at Jan. 03, 2016   56,904    
Ending balance at Jan. 03, 2016 20,325 $ 57 241,024 (220,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common stock issued under stock plans and employee stock purchase plans (in shares)   1,230    
Common stock issued under stock plans and employee stock purchase plans 424 $ 1 423  
Private stock offering, net of issuance costs (in shares)   10,000    
Adjustment of Common stock and Warrants issuance costs 8,803 $ 10 8,793  
Stock-based compensation 1,584   1,584  
Net loss (19,148)     (19,148)
Ending balance (in shares) at Jan. 01, 2017   68,134    
Ending balance at Jan. 01, 2017 $ 11,988 $ 68 $ 251,824 $ (239,904)