Asset Retirement Obligations - Narrative (Details) $ in Millions	Mar. 31, 2023 USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Obligation expected to be incurred	$ 25.1
Financial assurance in form of surety bond	$ 30.3

Represents the amount of expected present value of asset retirement obligations.

No definition available.

Name:	lnth_AssetRetirementObligationLiabilitiesExpectedPresentValue
Namespace Prefix:	lnth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant