Fixed Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Assets [Abstract]
Depreciation expense	$ 0.2	$ 0.2
Depreciation expenses related to sublet assets	$ 0.1	$ 0.1

The amount of depreciation expenses recognized in the period, excluding depreciation for leased assets as part of a sublease agreement.

No definition available.

Name:	lrmr_DepreciationExpenseExcludingLeasedAssets
Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration