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
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Number of Shares
Balance outstanding at beginning of period (in shares)	4,979	5,266	5,682
Granted (in shares)	0	842	225
Forfeited or expired (in shares)	(1,356)	(1,129)	(521)
Exercised (in shares)	(65)	0	(120)
Balance outstanding at end of period (in shares)	3,558	4,979	5,266
Exercisable (in shares)	3,001
Vested and expected to vest (in shares)	3,443
Weighted Average Exercise Price
Balance outstanding at beginning of period (in dollars per share)	$ 2.35	$ 2.64	$ 2.67
Granted (in dollars per share)	0.00	0.86	1.64
Forfeited or expired (in dollars per share)	3.07	2.61	2.87
Exercised (in dollars per share)	1.31	0.00	0.98
Balance outstanding at end of period (in dollars per share)	2.09	$ 2.35	$ 2.64
Exercisable (in dollars per share)	2.29
Vested and expected to vest (in dollars per share)	$ 2.13
Weighted Average Remaining Term
Balance outstanding	4 years 4 months 2 days	4 years 22 days	4 years 6 months 21 days
Exercisable	3 years 6 months 22 days
Vested and expected to vest	4 years 2 months 12 days
Aggregate Intrinsic Value
Balance outstanding	$ 976
Exercisable	524
Vested and expected to vest	$ 879