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Stockholders' Equity - Tax Benefit Provision Plan (Details) | Aug. 03, 2021
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Equity [Abstract] |
Share purchase right, convertible ratio | 1
Share purchase right, term | 3 years
Share purchase right, percentage of outstanding common shares acquired | 4.95%

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- Definition Preferred Share Purchase Right, Term + References No definition available. + Details
Name: | oas_PreferredSharePurchaseRightTerm
Namespace Prefix: | oas_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Share Purchase Right, Change of Control Percentage Per Individual + References No definition available. + Details
Name: | oas_SharePurchaseRightChangeOfControlPercentagePerIndividual
Namespace Prefix: | oas_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Share Purchase Right, Convertible Ratio + References No definition available. + Details
Name: | oas_SharePurchaseRightConvertibleRatio
Namespace Prefix: | oas_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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