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License and Collaboration Agreements - Summary of Revenue Recognized as a Result of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
License And Collaboration Agreements [Abstract] |  |  |
Amounts included in deferred revenue at the beginning of the period | $ 7,000 | $ 7,000 | $ 5,353

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

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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration