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Leases (Details) $ in Millions	Aug. 27, 2020 USD ($) ft²	Dec. 15, 2020 USD ($) ft²	Nov. 03, 2020 USD ($) ft²	Jun. 01, 2013 ft² item
MandalMed Services Agreement Area
Lease
Number of lease amendments | item				6
Area of property				5,762
Mandalmed Services Agreement Additional Area
Lease
Area of property			2,130
Term of contract			3 years
Security Deposit | $			$ 0.1
Office Space
Lease
Area of property	3,500
Term of contract	2 years
Renewal term	P1Y
Security Deposit | $	$ 0.1
Laboratory Lease Agreement
Lease
Area of property		9,800
Term of contract		5 years
Security Deposit | $		$ 0.4

X

- Definition

The number of lease amendments.

+ References

No definition available.

+ Details

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Namespace Prefix:	olma_
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X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- 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

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

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- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Details

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- Details

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