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Collaboration and license agreements - Summary of allocation of transaction price (Details) $ in Thousands | Jun. 30, 2025 USD ($)
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Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |
Transaction Price Allocated | $ 23,064
Transaction Price Unsatisfied | 14,648
Research and development targets |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |
Transaction Price Allocated | 20,688
Transaction Price Unsatisfied | 12,272
Option rights |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |
Transaction Price Allocated | 2,376
Transaction Price Unsatisfied | $ 2,376

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- 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

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- 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

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- 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

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

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