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v3.21.1

Leases - Narrative (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) lease
Leases [Abstract] |
Number of subleases | lease | 3
Monthly rent payments | $ | $ 80
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, 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, 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
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration