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Revenues - Summary of Transaction Price and Allocation of Transaction Price to the Performance Obligations (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($)
License And Collaboration Agreements [Line Items] |
Total allocated transaction price | $ 35
Inflammation target 1 |
License And Collaboration Agreements [Line Items] |
Total allocated transaction price | 18
Inflammation target 2 |
License And Collaboration Agreements [Line Items] |
Total allocated transaction price | $ 17

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- Definition Allocation to performance obligations. + References No definition available. + Details
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Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition License and collaboration agreements. + References No definition available. + Details
Name: | rcus_LicenseAndCollaborationAgreementsLineItems
Namespace Prefix: | rcus_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |