NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - ASC 606 (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2019 USD ($)
Change in contract liabilities
Beginning balance	$ 1,998
Revenue recognized	(680)
Ending balance	1,318
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	1,318
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-30
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 130
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-04
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 114
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-03
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 112
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-02
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 105
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 93
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-30
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 764
Revenue, remaining performance obligation, expected timing of satisfaction, period