COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total outstanding purchase obligation	$ 1,200
Total rent expense, net of sublease income	834	$ 878	$ 947
Wafer purchase commitment
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Outstanding commitment for purchase of wafer inventory	$ 1,600	$ 1,400