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Commitments and Contingencies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 4 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract] |  |
Underwriting discount per unit | $ 0.20 | $ 0.20
Payments for underwriting discount | $ 8.1 | $ 8.1
Deferred underwriting commission per unit | $ 0.35 | $ 0.35
Deferred underwriting commissions payable | $ 14.1 | $ 14.1

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- Definition Deferred underwriting commission per unit. + References No definition available. + Details
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Namespace Prefix: | opad_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Deferred underwriting commissions noncurrent. + References No definition available. + Details
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Namespace Prefix: | opad_
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Balance Type: | credit
Period Type: | instant

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- Definition Underwriting discount per unit. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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