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Leases (Details) - Schedule of finance lease obligations included in property and equipment - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of finance lease obligations included in property and equipment [Abstract] |  |
Laboratory equipment | $ 1,148 | $ 920
Furniture and fixtures | 46 | 46
Work in process |  | 228
Total | 1,194 | 1,194
Less accumulated depreciation | (629) | (593)
Net | $ 565 | $ 601

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- Definition Accumulated depreciation. + References No definition available. + Details
Name: | clnn_AccumulatedDepreciationDepletionAndAmortizationLeases
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease furniture and fixtures. + References No definition available. + Details
Name: | clnn_FinanceLeaseFurnitureAndFixturesGross
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease laboratory equipment. + References No definition available. + Details
Name: | clnn_FinanceLeaseLaboratoryEquipmentGross
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease liability. + References No definition available. + Details
Name: | clnn_FinanceLeaseLiabilityGross
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease liability, net. + References No definition available. + Details
Name: | clnn_FinanceLeaseLiabilityNet
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease work in process. + References No definition available. + Details
Name: | clnn_FinanceLeaseWorkInProcessGross
Namespace Prefix: | clnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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