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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