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Fixed Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Depreciation expense	$ 0.1	$ 0.1	$ 0.3	$ 0.2
Maximum [Member]
Depreciation expenses related to sublet assets	$ 0.1	$ 0.1	$ 0.1	$ 0.1

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

The amount of depreciation expense recognized in the period related to leased assets as part of a sublease agreement.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: