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Stockholders' Equity - Tax Benefit Provision Plan (Details) - Subsequent Event | Aug. 05, 2021
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Subsequent Event [Line Items] |
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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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |