LEASES - Other (Details) - USD ($) $ in Thousands		3 Months Ended
Apr. 01, 2021	Mar. 31, 2021	Mar. 31, 2020
LEASES
Lease rent expense		$ 40	$ 40
Purchase commitment	$ 10,900	17,900
Noncancellable commitments for purchases of equipment		$ 0

Amount of operating lease expense. Excludes sublease income.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration