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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Balance at Jan. 02, 2015 $ 37,099 $ 384 $ 178,232 $ (1,070) $ (140,447)
Balance (in shares) at Jan. 02, 2015   38,429      
Net loss (6,533) $ 0 0 0 (6,533)
Other comprehensive loss (510) 0 0 (510) 0
Common stock issued upon exercise of warrants 2,800 $ 7 2,793 0 0
Common stock issued upon exercise of warrants (in shares)   700      
Common stock issued upon exercise of options 2,168 $ 5 2,163 0 0
Common stock issued upon exercise of options (in shares)   476      
Stock-based compensation 3,820 $ 0 3,820 0 0
Stock-based compensation (in shares)   0      
Unvested restricted stock 0 $ 1 (1) 0 0
Unvested restricted stock (in shares)   124      
Vested restricted stock 2 $ 2 0 0 0
Vested restricted stock (in shares)   158      
Balance at Jan. 01, 2016 38,846 $ 399 187,007 (1,580) (146,980)
Balance (in shares) at Jan. 01, 2016   39,887      
Net loss (12,129) $ 0 0 0 (12,129)
Other comprehensive loss 530 0 0 530 0
Common stock issued upon exercise of options 2,438 $ 5 2,433 0 0
Common stock issued upon exercise of options (in shares)   541      
Stock-based compensation 8,827 $ 0 8,827 0 0
Stock-based compensation (in shares)   0      
Repurchase of employee common stock for taxes withheld (611) $ 0 (611) 0 0
Repurchase of employee common stock for taxes withheld (in shares)   (98)      
Unvested restricted stock 0 $ 0 0 0 0
Unvested restricted stock (in shares)   23      
Vested restricted stock 4 $ 3 1 0 0
Vested restricted stock (in shares)   379      
Balance at Dec. 30, 2016 37,905 $ 407 197,657 (1,050) (159,109)
Balance (in shares) at Dec. 30, 2016   40,732      
Net loss (2,139) $ 0 0 0 (2,139)
Other comprehensive loss (100) 0 0 (100) 0
Common stock issued upon exercise of options $ 3,970 $ 6 3,964 0 0
Common stock issued upon exercise of options (in shares) 557 557      
Stock-based compensation $ 3,533 $ 0 3,533 0 0
Stock-based compensation (in shares)   0      
Repurchase of employee common stock for taxes withheld (234) $ 0 (234) 0 0
Repurchase of employee common stock for taxes withheld (in shares)   (24)      
Unvested restricted stock 0 $ 0 0 0 0
Unvested restricted stock (in shares)   21      
Vested restricted stock 1 $ 1 0 0 0
Vested restricted stock (in shares)   97      
Balance at Dec. 29, 2017 $ 42,936 $ 414 $ 204,920 $ (1,150) $ (161,248)
Balance (in shares) at Dec. 29, 2017   41,383