Fixed Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Depreciation expense	$ 0.1	$ 0.1	$ 0.1	$ 0.2

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