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Stockholders' Equity - Securities Purchase Agreements (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended
	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