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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Statement of Cash Flows [Abstract] |  |
Receivable from related party | $ 715,273 | $ (3,981)
Other long-term assets to related party | (1,135) | 0
Deferred revenue from related party | (16,255) | (7,711)
Proceeds from issuance of common stock from a related party | $ 0 | $ 220,235

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 Increase decrease in other noncurrent assets related party. + References No definition available. + Details
Name: | rcus_IncreaseDecreaseInOtherNoncurrentAssetsRelatedParty
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from issuance of common stock from related party. + References No definition available. + Details
Name: | rcus_ProceedsFromIssuanceOfCommonStockFromRelatedParty
Namespace Prefix: | rcus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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