Net Loss Per Share - Narrative (Details) - shares shares in Thousands	Mar. 31, 2022	Feb. 04, 2022
Sponsor, escrow shares
Schedule Of Reverse Recapitalization [Line Items]
Earn-out shares (in shares)	1,625	1,625

Derivative Instrument, Contingent Consideration, Liability, Shares

No definition available.

Name:	lfly_DerivativeInstrumentContingentConsiderationLiabilityShares
Namespace Prefix:	lfly_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant