REVENUES - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Amount recognized in the period from amounts included in deferred revenue at beginning of period	$ 3.5
Unbilled receivables	$ 0.3	$ 0.0

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

No definition available.

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