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v3.23.1

Stockholders' Equity - Warrants (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Number of Warrants |  |
Balance of warrants outstanding at the end of the period (in shares) | 4,296,472 | 4,360,968
Expired (in shares) | (64,496) |
Balance of warrants outstanding at the beginning of the period (in shares) | 4,360,968 |
Weighted Average Exercise Price Per Share |  |
Weighted average exercise price of warrants at the beginning of the period (in USD per share) | $ 5.33 |
Expired (in USD per share) | 101.52 |
Weighted average exercise price of warrants at the end of the period (in USD per share) | $ 3.89 | $ 5.33
Term |  |
Weighted-Average Remaining Contractual Term | 1 year 9 months 18 days | 2 years 1 month 6 days

X
- Definition Class Of Warrant Or Right, Expired During Period + References No definition available. + Details
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Namespace Prefix: | crdf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period over which each class of warrants or rights outstanding may be exercised. + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | crdf_
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- Definition No definition available + References No definition available. + Details
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- References No definition available. + Details
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Period Type: | duration

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant