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Stockholders' Equity - Securities Purchase Agreements (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended
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Nov. 30, 2021 | May 31, 2021
Equity [Abstract] |  |
Sale of stock, shares issued (in shares) | 2.4 | 2.0
Gross proceeds | $ 15.0 | $ 20.0
Number of days counterparty cannot sell or transfer shares | 180 days |

X
- Definition Sale Of Stock, Consideration Received On Transaction, Gross + References No definition available. + Details
Name: | crdf_SaleOfStockConsiderationReceivedOnTransactionGross
Namespace Prefix: | crdf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Securities Purchase Agreement, Number Of Days Counterparty Cannot Sell Or Transfer Shares + References No definition available. + Details
Name: | crdf_SecuritiesPurchaseAgreementNumberOfDaysCounterpartyCannotSellOrTransferShares
Namespace Prefix: | crdf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration