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Collaboration and license agreements - Summary of allocation of transaction price (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	$ 19,064
Transaction Price Unsatisfied	16,199
Research and development targets
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	16,688
Transaction Price Unsatisfied	13,823
Option rights
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Transaction Price Allocated	2,376
Transaction Price Unsatisfied	$ 2,376

X

- Definition

Transaction price allocated to performance obligation.

+ References

No definition available.

+ Details

Name:	cccc_TransactionPriceAllocatedToPerformanceObligation
Namespace Prefix:	cccc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Transaction price unsatisfied to performance obligation.

+ References

No definition available.

+ Details

Name:	cccc_TransactionPriceUnsatisfiedToPerformanceObligation
Namespace Prefix:	cccc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=cccc_ResearchAndDevelopmentTargetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=cccc_OptionRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: