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Summary of Significant Accounting Policies - Summary of Change in Allowance for Credit Losses (Details) $ in Thousands | 9 Months Ended
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Jun. 30, 2022 USD ($)
Receivables [Abstract] |
Beginning balance | $ 879
Credit loss provision | (431)
Write-offs, net of recoveries | 18
Foreign exchange impact on ending balance | (71)
Ending balance | $ 395

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- Definition Accounts receivable and contract with customer assets allowance for credit loss + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLoss
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts receivable and contract with customer assets allowance for credit loss foreign exchange impact. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLossForeignExchangeImpact
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accounts receivable and contract with customer assets allowance for credit loss (write-offs) net of recoveries. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsAllowanceForCreditLossWriteOffsNetOfRecoveries
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Accounts receivable and contract with customer assets provision for credit loss. + References No definition available. + Details
Name: | crnc_AccountsReceivableAndContractWithCustomerAssetsProvisionForCreditLoss
Namespace Prefix: | crnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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