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Summary of significant accounting policies - Research and development incentives and receivable (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2024 | Apr. 01, 2023 | Mar. 31, 2023 | Feb. 29, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Oct. 31, 2024 | Dec. 31, 2023
Research and development incentives and receivable |  |  |  |  |  |  |  |  |  |
Reduction of research and development |  |  |  |  | $ 8,500 | $ 5,000 | $ 31,100 | $ 17,600 |  |
Research and development incentives receivable |  |  |  |  | $ 57,982 |  | $ 57,982 |  |  | $ 24,039
Research and development incentives received amount |  |  |  |  |  |  |  |  | $ 31,700 |
Certain research and development expenditures incurred prior to April 1, 2023 |  |  |  |  |  |  |  |  |  |
Research and development incentives and receivable |  |  |  |  |  |  |  |  |  |
Percentage of surrenderable losses |  |  | 33.35% |  |  |  |  |  |  |
Certain research and development expenditures incurred thereafter April 1, 2023 |  |  |  |  |  |  |  |  |  |
Research and development incentives and receivable |  |  |  |  |  |  |  |  |  |
Percentage of surrenderable losses |  | 18.60% |  | 26.97% |  |  |  |  |  |
Certain research and development expenditures incurred April 1, 2024 and thereafter |  |  |  |  |  |  |  |  |  |
Research and development incentives and receivable |  |  |  |  |  |  |  |  |  |
Percentage of surrenderable losses |  | 40.00% |  |  |  |  |  |  |  |
Percentage of total expenditure | 30.00% |  |  |  |  |  |  |  |  |

X
- Definition Amount of reduction of research and development expense. + References No definition available. + Details
Name: | bcyc_ReductionOfResearchAndDevelopmentExpense
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of research and development incentives receivables, classified as current. + References No definition available. + Details
Name: | bcyc_ResearchAndDevelopmentIncentivesReceivableCurrent
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of research and development incentives received. + References No definition available. + Details
Name: | bcyc_ResearchAndDevelopmentIncentivesReceived
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of tax credit on total expenditure during the period that arise from qualifying research and development expenses incurred by the Company's subsidiaries in the United Kingdom. + References No definition available. + Details
Name: | bcyc_ResearchAndDevelopmentPercentageOfTaxCreditOnTotalExpenditure
Namespace Prefix: | bcyc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of tax credit on surrenderable trading losses that arise from qualifying research and development expenses incurred by the Company's subsidiaries in the United Kingdom. + References No definition available. + Details
Name: | bcyc_ResearchAndDevelopmentTaxReliefsProgramPercentageOfTaxCreditOnSurrenderableLosses
Namespace Prefix: | bcyc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_StatementScenarioAxis=bcyc_CertainResearchAndDevelopmentExpendituresIncurredPriorToApril12023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=bcyc_CertainResearchAndDevelopmentExpendituresIncurredThereafterApril12023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=bcyc_CertainResearchAndDevelopmentExpendituresIncurredThereafterApril12024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |