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Significant Contracts (Narrative) (Details) $ in Millions | Oct. 01, 2018 item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | ---
Supply Commitment [Line Items] |  |  |
Future milestone payments payable | $ |  | $ 0.0 | $ 0.0
Clinical Collaboration Agreement [Member] | The University of Texas MD Anderson Cancer Center [Member] |  |  |
Supply Commitment [Line Items] |  |  |
Term of agreement | 3 years |  |
Number of clinical studies conducted | item | 4 |  |

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- Definition Represent the number of clinical studies conduct. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The potential future milestone payments required to be made under certain contractual agreements. + References No definition available. + Details
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Namespace Prefix: | cycc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition It represents term of agreement. + References No definition available. + Details
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Namespace Prefix: | cycc_
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Balance Type: | na
Period Type: | duration

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 No definition available. + Details
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- Details
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Namespace Prefix: |
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X
- Details
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Period Type: |