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Stockholders' Equity - Warrants (Details) - $ / shares | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020
Number of Warrants |  |
Balance of warrants outstanding at the end of the period (in shares) |  | 7,373,351
Granted (in shares) |  | 5,831,451
Exercised (in shares) |  | (9,047,582)
Balance of warrants outstanding at the beginning of the period (in shares) | 10,589,482 | 10,589,482
Weighted Average Exercise Price Per Share |  |
Weighted average exercise price of warrants at the beginning of the period (in USD per share) | $ 4.08 | $ 4.08
Granted (in USD per share) |  | 1.70
Exercised (in USD per share) |  | 2.17
Weighted average exercise price of warrants at the end of the period (in USD per share) |  | $ 4.54
Term |  |
Weighted-Average Remaining Contractual Term | 3 years 8 months 12 days | 4 years 3 months 18 days
Pre-Funded Warrants |  |
Number of Warrants |  |
Granted (in shares) |  | 992,039

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_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of warrants or rights granted 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_
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Balance Type: | na
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- References No definition available. + Details
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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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- 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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Period Type: | duration

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

X
- Details
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Namespace Prefix: |
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Period Type: |