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Consolidated Statements Of Stockholders' Equity And Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
Series A Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance at Jan. 02, 2010    $ 20 $ 71,332 $ (52,026) $ (57) $ 19,269
Balance, shares at Jan. 02, 2010    20,111        
Stock-based compensation      1,482     1,482
Stock-based compensation,shares   493        
Exercise of stock options      81     81
Exercise of stock options, shares   84        
Repurchase of common stock      (49)     (49)
Repurchase of common stock, shares   (16)        
Exercise of warrants      23     23
Exercise of warrants, shares    18        
Issuance of common stock    5 16,205     16,210
Issuance of common stock, shares   4,594        
Components of comprehensive loss:            
Change in net unrealized loss on investments          (54) (54)
Net loss        (15,115)   (15,115)
Comprehensive loss            (15,169)
Balance at Jan. 01, 2011    25 89,074 (67,141) (111) 21,847
Balance, shares at Jan. 01, 2011    25,284        
Stock-based compensation      1,620     1,620
Stock-based compensation,shares   11        
Exercise of stock options      203     203
Exercise of stock options, shares   435        
Repurchase of common stock      (78)     (78)
Repurchase of common stock, shares   (37)        
Issuance of common stock    1 1,890     1,891
Issuance of common stock, shares   697        
Components of comprehensive loss:            
Change in net unrealized loss on investments          55 55
Net loss        (5,599)   (5,599)
Comprehensive loss            (5,544)
Balance at Dec. 31, 2011    $ 26 $ 92,709 $ (72,740) $ (56) $ 19,939
Balance, shares at Dec. 31, 2011    26,390