COMMITMENTS AND CONTINGENCIES, Registration and Stockholder Rights (Details)	Dec. 31, 2020 Individual
Maximum [Member]
Registration and Stockholder Rights [Abstract]
Number of demands eligible security holder can make	3

Represents the number of demands eligible security holder can make.

No definition available.

Name:	lftr_NumberOfDemandsEligibleSecurityHolderCanMake
Namespace Prefix:	lftr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant