STOCK-BASED COMPENSATION - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Number of Shares
Balance outstanding at beginning of period, (in shares)	3,558	4,979	5,266
Granted (in shares)	0	0	842
Forfeited or expired, (in shares)	(141)	(1,356)	(1,129)
Exercised (in shares)	(216)	(65)	0
Balance outstanding at end of period, (in shares)	3,201	3,558	4,979	5,266
Exercisable, (in shares)	2,868
Vested and expected to vest, (in shares)	3,153
Weighted Average Exercise Price
Balance outstanding at beginning of period, (in dollars per share)	$ 2.09	$ 2.35	$ 2.64
Granted (in dollars per share)	0	0	0.86
Forfeited or expired, (in dollars per share)	1.80	3.07	2.61
Exercised (in dollars per share)	0.90	1.31	0
Balance outstanding at end of period, (in dollars per share)	2.18	$ 2.09	$ 2.35	$ 2.64
Exercisable, (in dollars per share)	2.33
Vested and expected to vest, (in dollars per share)	$ 2.20
Weighted Average Remaining Term
Balance outstanding	3 years 8 months 12 days	4 years 4 months 2 days	4 years 21 days	4 years 6 months 21 days
Exercisable	3 years 2 months 26 days
Vested and expected to vest	3 years 7 months 20 days
Aggregate Intrinsic Value
Balance outstanding	$ 0