RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 29, 2020	Mar. 31, 2019	Dec. 29, 2019
Director
Related Party Transactions
Revenues and NAF contributions	$ 344	$ 388
Accounts receivable from related parties	344		$ 290
Beneficial Owner
Related Party Transactions
Revenues and NAF contributions	166	$ 77
Accounts receivable from related parties	$ 111		$ 77
Beneficial ownership percentage	18.20%

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant