REVENUE RECOGNITION - Estimated Revenues Expected And Change In Contract Liabilities Default (Details) $ in Thousands	9 Months Ended
	Sep. 29, 2019 USD ($)
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 1,371
Change in contract liabilities
Beginning balance	1,998
Revenue recognized	(627)
Ending balance	1,371
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30
Estimated future revenues expected to be recognized for performance obligations
Revenue expected to be recognized	$ 38
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
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	$ 139
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	$ 121
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	$ 117
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	$ 108
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	$ 848
Revenue, remaining performance obligation, expected timing of satisfaction, period