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Lease - Schedule of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Cash paid for amounts included in measurement of lease liabilities: |  |
Operating cash outflows - payments on operating leases | $ 1,511 | $ 1,595
Right-of-use assets obtained in exchange for new lease obligations: |  |
Operating leases | $ 0 | $ 0

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- Definition Operating cash outflows - payments on operating leases + References No definition available. + Details
Name: | ctkb_OperatingCashOutflowsPaymentsOnOperatingLeases
Namespace Prefix: | ctkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Right-of-use assets obtained in exchange for new lease obligations. + References No definition available. + Details
Name: | ctkb_RightOfUseAssetsObtainedInExchangeForNewLeaseObligations
Namespace Prefix: | ctkb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Right of use assets obtained in exchange for new lease obligations abstract + References No definition available. + Details
Name: | ctkb_RightOfUseAssetsObtainedInExchangeForNewLeaseObligationsAbstract
Namespace Prefix: | ctkb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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