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v3.22.1

Leases - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) ft² lease
Leases [Abstract] |
Area of lease | 12,300
Monthly rent payments | $ | $ 60
Annual rent increase, percentage | 3.00%
Number of subleases | lease | 3
Area of sublease | 16,600

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

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- 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

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- 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

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