Future remaining clinical and regulatory milestone payments.

No definition available.

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Namespace Prefix:	mbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lease commencement date.

+ References

No definition available.

+ Details

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

- Definition

License fees paid.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum additional clinical and regulatory milestones amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of Months Option to Extend

+ References

No definition available.

+ Details

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

- Definition

Amount of increase (decrease) in obligation for operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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

- Definition

Indicates (true false) whether lessee has option to extend operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of terms and conditions of option to terminate lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

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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
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

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

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_TypeOfArrangementAxis=mbx_LicenseAgreementMember
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Commitments and Contingencies - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	May 09, 2025	Apr. 30, 2022	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jan. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Increase in lease liability					$ 479,000	$ (75,000)
Operating lease rent expense			$ 100,000	$ 100,000	100,000	100,000
Cash paid for amounts included in measurement of operating lease liability			100,000	100,000	100,000	100,000
The License Agreement \| IURTC
Lessee, Lease, Description [Line Items]
Additional clinical and regulatory milestones							$ 9,000,000
Future remaining clinical and regulatory milestone payments							$ 9,300,000
License fees paid			$ 0	$ 0	$ 0	$ 0
The Carmel Lease
Lessee, Lease, Description [Line Items]
Lease term (in months)		39 months
Termination of lease	December 31, 2028				December 31, 2025
Lessee, Operating Lease, Existence of Option to Extend [true false]	true	true
Lease option to extend	option to extend for 36 additional				option to extend for 36 additional
Number of additional months option to extend	36 months
Increase in lease liability					$ 600,000
The Laboratory Lease
Lessee, Lease, Description [Line Items]
Lease term (in months)								12 months
Termination of lease					December 2024
Laboratory Space
Lessee, Lease, Description [Line Items]
Termination of lease					December 2025
Lease commencement date			2024-12		2024-12