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Stockholders' Equity - Warrants (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Number of Warrants |  |
Balance of warrants outstanding at the end of the period (in shares) | 4,490,159 | 5,260,992
Exercised (in shares) | (770,833) |
Balance of warrants outstanding at the beginning of the period (in shares) | 5,260,992 |
Weighted Average Exercise Price Per Share |  |
Weighted average exercise price of warrants at the beginning of the period (in USD per share) | $ 5.19 |
Exercised (in USD per share) | 1.64 |
Weighted average exercise price of warrants at the end of the period (in USD per share) | $ 5.80 | $ 5.19
Term |  |
Weighted-Average Remaining Contractual Term | 3 years 8 months 12 days | 4 years 1 month 6 days

X
- Definition Represents the number of warrants or rights exercised during the 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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Namespace Prefix: | crdf_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | crdf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average exercise price of each class of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | crdf_
Data Type: | num:perShareItemType
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- Definition No definition available + References No definition available. + Details
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X
- Definition Represents the weighted average exercise price of each class of warrants or rights exercised during the period. + References No definition available. + Details
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Namespace Prefix: | crdf_
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- References No definition available. + Details
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Namespace Prefix: | crdf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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