Area of office space.

No definition available.

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Namespace Prefix:	lrmr_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease term commencement date.

+ References

No definition available.

+ Details

Name:	lrmr_LeaseTermCommencementDate
Namespace Prefix:	lrmr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount that may be deducted from consideration due to Licensor 2 as a percentage of consideration paid to Licensor 1, whereby Licensor 1 is the identified party.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of expense recognized during the period related to milestones. Such amount may include, but is not limited to, amounts due for attainment of milestones as well as deductions granted as part of a license agreement.

+ References

No definition available.

+ Details

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

- Definition

Amount of payment due for milestones that have been achieved

+ References

No definition available.

+ Details

Name:	lrmr_MilestoneLiability
Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of payment due upon reaching milestone.

+ References

No definition available.

+ Details

Name:	lrmr_MilestonePaymentAmount
Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The minimum annual royalty payment that is required under a contractual arrangement.

+ References

No definition available.

+ Details

Name:	lrmr_MinimumAnnualRoyaltyObligation
Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Payment for license agreements.

+ References

No definition available.

+ Details

Name:	lrmr_PaymentForLicenseAgreements
Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Sublease annual base rent.

+ References

No definition available.

+ Details

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Namespace Prefix:	lrmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date which lease or group of leases is set to expire, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
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-SubTopic 20
-Section 55
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Name:	us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

+ Details

Name:	us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Section S99
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-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_StatementGeographicalAxis=stpr_PA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=country_MA
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Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LetterOfCreditMember
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Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=lrmr_OfficeSubleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Name:	us-gaap_LeaseContractualTermAxis=lrmr_FirstSubleaseYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseContractualTermAxis=lrmr_FinalSubleaseYearMember
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Data Type:	na
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- Details

Name:	us-gaap_LeaseContractualTermAxis=lrmr_SixthSubleaseYearMember
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Commitments and Contingencies - Additional Information (Detail) $ in Thousands								3 Months Ended		6 Months Ended
	Aug. 09, 2021	Oct. 27, 2020 USD ($)	Aug. 04, 2020	May 28, 2020 USD ($) ft²	Dec. 11, 2019 USD ($)	Aug. 08, 2019	Nov. 05, 2018	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021	Nov. 30, 2016 USD ($)
Other Commitments [Line Items]
Milestone expenses								$ 0		$ 0
Milestone payments due								$ 0		$ 0
Weighted average remaining lease term in years								7 years 2 months 12 days		7 years 2 months 12 days		7 years 7 months 6 days
Weighted average discount rate								11.00%		11.00%		11.00%
Lease expenses								$ 100	$ 100	$ 200	$ 100
Pennsylvania [Member] \| Office [Member]
Other Commitments [Line Items]
Operating lease term						3 years 6 months
Lease extension period						3 years
Lease term commencement date						Feb. 15, 2020
Pennsylvania [Member] \| Office and Lab [Member]
Other Commitments [Line Items]
Lease extension period							2 years
Lease term commencement date							Jan. 01, 2019
Lease term expiration date	Dec. 31, 2022		Dec. 31, 2021				Dec. 31, 2020
Massachusetts [Member] \| Office [Member]
Other Commitments [Line Items]
Area of office space \| ft²				17,705
Lease term expiration date				Oct. 30, 2029
Massachusetts [Member] \| Office [Member] \| Letter of Credit
Other Commitments [Line Items]
Letter of credit				$ 1,300
Massachusetts [Member] \| Office Sublease [Member]
Other Commitments [Line Items]
Lease term commencement date		Dec. 04, 2020
Lease term expiration date		Oct. 30, 2029
Massachusetts [Member] \| First Sublease Year [Member] \| Office Sublease [Member]
Other Commitments [Line Items]
Annual base rent		$ 800
Massachusetts [Member] \| First Sublease Year [Member] \| Office Sublease [Member] \| Letter of Credit
Other Commitments [Line Items]
Lease security deposits letters of credit		800
Massachusetts [Member] \| Final Sublease Year [Member] \| Office Sublease [Member]
Other Commitments [Line Items]
Annual base rent		1,000
Massachusetts [Member] \| Sixth Sublease Year \| Office Sublease [Member] \| Letter of Credit
Other Commitments [Line Items]
Lease security deposits letters of credit		$ 400
WFUHS [Member]
Other Commitments [Line Items]
License agreement consideration deduction percentage													60.00%
WFUHS [Member] \| Maximum [Member]
Other Commitments [Line Items]
Milestone payments													$ 2,600
IU [Member]
Other Commitments [Line Items]
License agreement consideration deduction percentage													20.00%
IU [Member] \| Maximum [Member]
Other Commitments [Line Items]
Milestone payments													$ 2,600
Annual royalty pay obligation													$ 100
WFUHS and IU [Member] \| Maximum [Member]
Other Commitments [Line Items]
Payment for license agreements					$ 100