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Commitments and Contingencies - Additional Information (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Arbitration settlement |  | $ 12,552,000
Letter of credit subcommitment |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding amount | $ 11,277,000 |

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- Definition Arbitration settlement. + References No definition available. + Details
Name: | crda_ArbitrationSettlement
Namespace Prefix: | crda_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |