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Commitments and Contingencies - Founder Royalty arrangements (Details) - Founders and initial investors - Royalty Agreements $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Founder Royalty arrangements |
Period of royalty payments agreed under arrangement | 10 years
Royalties paid | $ 0

X
- Definition Period of royalty payments agreed under arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | bcyc_PeriodOfRoyaltyPaymentsAgreedUnderArrangement
Namespace Prefix: | bcyc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash paid for royalties during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bcyc_FounderAndInitialInvestorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=us-gaap_RoyaltyAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |