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Legal Settlement Liability - Schedule of Legal Settlement Liability (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Legal settlement liability | $ 2,503 | $ 2,561
Legal settlement liability | 16,912 | 16,477
Total legal settlement liability | $ 19,415 | $ 19,038

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- Definition Legal settlement liability + References No definition available. + Details
Name: | ctkb_LegalSettlementLiability
Namespace Prefix: | ctkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Legal settlement liability current + References No definition available. + Details
Name: | ctkb_LegalSettlementLiabilityCurrent
Namespace Prefix: | ctkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Legal settlement liability Noncurrent + References No definition available. + Details
Name: | ctkb_LegalSettlementLiabilityNonCurrent
Namespace Prefix: | ctkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration