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v3.20.4

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Cash Flows [Abstract] |  |  |
Receivable from related party | $ 943 | $ 0 | $ 0
Deferred revenue from related party | 185,379 | 0 | 0
Other long term liabilities from related party | $ 9,703 | $ 0 | $ 0

X
- Definition Deferred revenue from related party. + References No definition available. + Details
Name: | rcus_DeferredRevenueFromRelatedParty
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other long term liabilities from related party. + References No definition available. + Details
Name: | rcus_OtherLongTermLiabilitiesFromRelatedParty
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Receivable from related party. + References No definition available. + Details
Name: | rcus_ReceivableFromRelatedParty
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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