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v3.25.3

Fair Value Measurements - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Remaining contractual maturities for available-for-sale securities | one month to fifteen months

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- Definition Debt Securities Available For Sale Remaining Contractual Maturities period. + References No definition available. + Details
Name: | om_DebtSecuritiesAvailableForSaleRemainingContractualMaturitiesPeriod
Namespace Prefix: | om_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration