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Leases - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended | 62 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) ft² lease | Dec. 31, 2022 USD ($) | Feb. 28, 2027 ft²
Lessee, Lease, Description [Line Items] |  |  |
Number of subleases | lease | 3 |  |
Area of lease occupied by company | 9,500 |  |
Area of lease | 26,100 |  |
Area of sublease | 16,600 |  |
Monthly rent payments | $ | $ 80 |  |
Forecast |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease not yet commenced, area |  |  | 12,300
Monthly rent payments | $ |  | $ 55 |
Annual rent increase, percentage |  |  | 3.00%

X
- Definition Lessee, Operating Lease, Annual Rent Increase, Percentage + References No definition available. + Details
Name: | crdf_LesseeOperatingLeaseAnnualRentIncreasePercentage
Namespace Prefix: | crdf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Area Of Lease + References No definition available. + Details
Name: | crdf_LesseeOperatingLeaseAreaOfLease
Namespace Prefix: | crdf_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Area Of Lease Occupied By Company + References No definition available. + Details
Name: | crdf_LesseeOperatingLeaseAreaOfLeaseOccupiedByCompany
Namespace Prefix: | crdf_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Area Of Lease + References No definition available. + Details
Name: | crdf_LesseeOperatingLeaseLeaseNotYetCommencedAreaOfLease
Namespace Prefix: | crdf_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Monthly Rent Payment + References No definition available. + Details
Name: | crdf_LesseeOperatingLeaseMonthlyRentPayment
Namespace Prefix: | crdf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lessor, Area Of Sublease + References No definition available. + Details
Name: | crdf_LessorAreaOfSublease
Namespace Prefix: | crdf_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessor, Number Of Subleases + References No definition available. + Details
Name: | crdf_LessorNumberOfSubleases
Namespace Prefix: | crdf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |