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Business Combination (Additional Information) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 28, 2025 | Jun. 27, 2025
Business Combination [Abstract] |  |
AgreedUponCashToAquireBusiness |  | $ 475.0
AgreedUponCommonStockSharesToAquireBusiness |  | 706,215
AgreedUponTotalTransactionValueToAquireBusiness |  | $ 545.0
AquisitionTransactionRelatedCosts | $ 2.5 |

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- Definition AgreedUponCashToAquireBusiness + References No definition available. + Details
Name: | onto_AgreedUponCashToAquireBusiness
Namespace Prefix: | onto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AgreedUponCommonStockSharesToAquireBusiness + References No definition available. + Details
Name: | onto_AgreedUponCommonStockSharesToAquireBusiness
Namespace Prefix: | onto_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition AgreedUponTotalTransactionValueToAquireBusiness + References No definition available. + Details
Name: | onto_AgreedUponTotalTransactionValueToAquireBusiness
Namespace Prefix: | onto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition AquisitionTransactionRelatedCosts + References No definition available. + Details
Name: | onto_AquisitionTransactionRelatedCosts
Namespace Prefix: | onto_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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