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v3.21.2

Leases - Narrative (Details) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 ft² | Jun. 30, 2021 USD ($) ft² lease
Lessee, Lease, Description [Line Items] |  |
Number of subleases | lease |  | 3
Monthly rent payments | $ |  | $ 80
Annual rent increase, percentage |  | 3.00%
Area of lease |  | 26,100
Subsequent Event |  |
Lessee, Lease, Description [Line Items] |  |
Lease not yet commenced, area | 12,300 |

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, 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, 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: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |