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Significant agreements - Revenue recognition due to changes in contract assets and liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant agreements |  |  |
Revenue recognized based on proportional performance | $ 24,266 | $ 19,160 | $ 12,358
Revenue recognized based on expiration of material rights | 10,576 | 7,816 | 1,433
Revenue recognized based on changes in transaction price | 433 |  | 672
Total | $ 35,275 | $ 26,976 | $ 14,463

X
- Definition Amount of revenue recognized based on changes in transaction price that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
Name: | bcyc_ContractWithCustomerLiabilityRevenueRecognizedChangesInTransactionPrice
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized based on expiration of material rights that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
Name: | bcyc_ContractWithCustomerLiabilityRevenueRecognizedExpirationOfMaterialRights
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized based on proportional performance that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
Name: | bcyc_ContractWithCustomerLiabilityRevenueRecognizedProportionalPerformanceObligation
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from both the beginning balance and current period increase in contract liability. + References No definition available. + Details
Name: | bcyc_TotalRevenueRecognizedFromBothBeginningBalanceAndCurrentPeriodIncreaseInContractLiability
Namespace Prefix: | bcyc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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