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STOCK-BASED COMPENSATION - Schedule of Stock Options Outstanding and Stock Option Activity and Related Weighted Average Exercise Price (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Number of Shares      
Balance outstanding at beginning of period (in shares) 5,266 5,682 7,242
Granted (in shares) 842 225 428
Forfeited or expired (in shares) (1,129) (521) (219)
Exercised (in shares) 0 (120) (1,769)
Balance outstanding at end of period (in shares) 4,979 5,266 5,682
Exercisable (in shares) 4,078    
Vested and expected to vest (in shares) 4,740    
Weighted Average Exercise Price      
Balance outstanding at beginning of period (in dollars per share) $ 2.64 $ 2.67 $ 2.62
Granted (in dollars per share) 0.86 1.64 3.51
Forfeited or expired (in dollars per share) 2.61 2.87 3.56
Exercised (in dollars per share) 0.00 0.98 2.57
Balance outstanding at end of period (in dollars per share) 2.35 $ 2.64 $ 2.67
Exercisable (in dollars per share) 2.59    
Vested and expected to vest (in dollars per share) $ 2.41    
Weighted Average Remaining Term      
Balance outstanding 4 years 22 days    
Exercisable 2 years 10 months 25 days    
Vested and expected to vest 3 years 9 months 11 days    
Aggregate Intrinsic Value      
Balance outstanding $ 586    
Exercisable 199    
Vested and expected to vest $ 473