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STOCK-BASED COMPENSATION - Schedule of Significant Price Ranges of Options Outstanding, Related Weighted Average Exercise Prices and Contractual Life Information (Details)
shares in Thousands
12 Months Ended
Jan. 01, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 4,979
Weighted Average Remaining Contractual Life 4 years 22 days
Weighted Average Exercise Price (in dollars per share) $ 2.35
Options Vested and Exercisable (in shares) | shares 4,078
Weighted Average Exercise Price (in dollars per share) $ 2.59
$0.78 - $0.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 4
Weighted Average Remaining Contractual Life 2 years 2 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 0.78
Options Vested and Exercisable (in shares) | shares 5
Weighted Average Exercise Price (in dollars per share) $ 0.78
Range of exercise price, minimum (in dollars per share) 0.78
Range of exercise price, maximum (in dollars per share) $ 1.55
0.86 - 0.86  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 726
Weighted Average Remaining Contractual Life 9 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 0.86
Options Vested and Exercisable (in shares) | shares 0
Weighted Average Exercise Price (in dollars per share) $ 0.00
Range of exercise price, minimum (in dollars per share) 1.63
Range of exercise price, maximum (in dollars per share) $ 1.63
0.90 - 1.32  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 463
Weighted Average Remaining Contractual Life 2 years 7 months 13 days
Weighted Average Exercise Price (in dollars per share) $ 0.96
Options Vested and Exercisable (in shares) | shares 414
Weighted Average Exercise Price (in dollars per share) $ 0.92
Range of exercise price, minimum (in dollars per share) 2.00
Range of exercise price, maximum (in dollars per share) $ 2.52
1.63 - 1.63  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 731
Weighted Average Remaining Contractual Life 1 year 11 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 1.63
Options Vested and Exercisable (in shares) | shares 731
Weighted Average Exercise Price (in dollars per share) $ 1.63
Range of exercise price, minimum (in dollars per share) 2.65
Range of exercise price, maximum (in dollars per share) $ 2.76
2.17 - 2.76  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 446
Weighted Average Remaining Contractual Life 4 years 15 days
Weighted Average Exercise Price (in dollars per share) $ 2.29
Options Vested and Exercisable (in shares) | shares 446
Weighted Average Exercise Price (in dollars per share) $ 2.29
Range of exercise price, minimum (in dollars per share) 2.78
Range of exercise price, maximum (in dollars per share) $ 2.78
2.78 - 2.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 1,299
Weighted Average Remaining Contractual Life 3 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 2.78
Options Vested and Exercisable (in shares) | shares 1,299
Weighted Average Exercise Price (in dollars per share) $ 2.78
Range of exercise price, minimum (in dollars per share) 2.82
Range of exercise price, maximum (in dollars per share) $ 3.20
2.82 - 3.39  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 635
Weighted Average Remaining Contractual Life 5 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 3.29
Options Vested and Exercisable (in shares) | shares 530
Weighted Average Exercise Price (in dollars per share) $ 3.28
Range of exercise price, minimum (in dollars per share) 3.21
Range of exercise price, maximum (in dollars per share) $ 3.48
3.48 - 3.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 185
Weighted Average Remaining Contractual Life 5 years 7 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 3.60
Options Vested and Exercisable (in shares) | shares 164
Weighted Average Exercise Price (in dollars per share) $ 3.57
Range of exercise price, minimum (in dollars per share) 3.54
Range of exercise price, maximum (in dollars per share) $ 3.92
3.92 - 3.92  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 2
Weighted Average Remaining Contractual Life 4 years 3 months 11 days
Weighted Average Exercise Price (in dollars per share) $ 3.92
Options Vested and Exercisable (in shares) | shares 1
Weighted Average Exercise Price (in dollars per share) $ 3.92
Range of exercise price, minimum (in dollars per share) 4.17
Range of exercise price, maximum (in dollars per share) $ 4.17
4.17 - 4.17  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 488
Weighted Average Remaining Contractual Life 9 months 14 days
Weighted Average Exercise Price (in dollars per share) $ 4.17
Options Vested and Exercisable (in shares) | shares 488
Weighted Average Exercise Price (in dollars per share) $ 4.17
Range of exercise price, minimum (in dollars per share) 5.94
Range of exercise price, maximum (in dollars per share) $ 5.94