XML 85 R65.htm IDEA: XBRL DOCUMENT
v3.20.4

Commitments - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract] |  |
Purchase commitments cancellation notice period | 30 days |
Liabilities for Indemnification rights and agreements | $ 0 | $ 0

X
- Definition Liabilities for indemnification rights and agreements. + References No definition available. + Details
Name: | rcus_LiabilitiesForIndemnificationRightsAndAgreements
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments cancellation period. + References No definition available. + Details
Name: | rcus_PurchaseCommitmentsCancellationPeriod
Namespace Prefix: | rcus_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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