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v3.21.2

Commitments and Contingencies - Additional Information (Details) $ in Millions | 9 Months Ended
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Jun. 30, 2021 USD ($)
Loss Contingencies [Line Items] |
Indemnification period for former officers and members of the boards of directors | 6 years
Bellevue, Washington Office Space |
Loss Contingencies [Line Items] |
Letter of credit as security deposit | $ 1.7
Other Facility |
Loss Contingencies [Line Items] |
Letter of credit as security deposit | $ 0.6

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- Definition Indemnification period for former officers and members of boards of directors. + References No definition available. + Details
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Namespace Prefix: | crnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=crnc_BellevueWashingtonOfficeSpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=crnc_OtherFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |