Fixed Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Depreciation expense	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Depreciation expenses related to sublet assets				$ 0.1
Maximum [Member]
Depreciation expenses related to sublet assets	$ 0.1	$ 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