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Employee Benefit Plans (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension Plan [Member] |  |
Employee benefit plans |  |
Contribution made by the entity under the pension plan | $ 43,000 | $ 53,000
401 (k) Plan [Member] |  |
Employee benefit plans |  |
Matching contribution by employer as a percentage of the employee's deferral | 100.00% |
Matching contribution by employer as a percentage of U.S. employee's qualifying compensation | 6.00% |
Statutorily prescribed annual limit of contributions made by an employee before attaining age of 50 years | $ 19,500 |
Statutorily prescribed annual limit of contributions made by an employee after attaining age of 50 years | $ 26,000 |
Specified age limit of employees for calculation of statutorily prescribed annual limit of contribution | 50 years |
Contribution made by the entity under the 401(k) Plan | $ 57,000 | $ 55,000

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- Definition Represents the statutorily prescribed annual limit of contributions made by an employee to the defined contribution plan after attaining specified age. + References No definition available. + Details
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Namespace Prefix: | cycc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the statutorily prescribed annual limit of contributions made by an employee to the defined contribution plan before attaining specified age. + References No definition available. + Details
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Namespace Prefix: | cycc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the percentage of employees' deferral for which the employer contributes a matching contribution to the defined contribution plan. + References No definition available. + Details
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- Definition Represents the specified age limit of employees for calculation of statutorily prescribed annual limit of contribution. + References No definition available. + Details
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Namespace Prefix: | cycc_
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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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 No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |