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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
One-time milestone payments to Aurigene	$ 10,000	$ 5,000

X

- Definition

One time milestone payments to aurigene.

+ References

No definition available.

+ Details

Name:	olma_OneTimeMilestonePaymentsToAurigene
Namespace Prefix:	olma_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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