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Commitments and Contingencies - Additional Information (Details) $ in Millions | Sep. 30, 2021 USD ($) Home
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Commitments And Contingencies Disclosure [Abstract] |
Contract to purchase homes | Home | 415
Aggregate purchase price | $ | $ 140.0

X
- Definition Contractual obligation to purchase home. + References No definition available. + Details
Name: | opad_ContractualObligationToPurchaseHome
Namespace Prefix: | opad_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant