XML 44 R34.htm IDEA: XBRL DOCUMENT v3.24.3

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:

X

- 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: