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Leases - Summary of Cash and Non-cash Information Related to Operating Leases (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Leases [Abstract] |  |
Cash paid for amounts included in measurement of lease liabilities | $ 4 | $ 4

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- Definition Cash paid for amounts included in measurement of lease liabilities. + References No definition available. + Details
Name: | rcus_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilities
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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