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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2024
Stockholders' Equity Note [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense related to Cardiff Oncology equity awards have been recognized in operating results as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Included in research and development expense |  | $ | 436 |  |  | $ | 294 |  |  | $ | 1,223 |  |  | $ | 985 |
Included in selling, general and administrative expense |  |  | 817 |  |  |  | 661 |  |  |  | 2,333 |  |  |  | 2,615 |
Total stock-based compensation expense |  | $ | 1,253 |  |  | $ | 955 |  |  | $ | 3,556 |  |  | $ | 3,600 |
Schedule of Assumptions to Estimate Fair Value of Stock Option Awards | The estimated fair value of stock option awards was determined on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions during the following periods indicated:
|  | Nine Months Ended September 30, |
|  | 2024 |  |  | 2023 |
Risk-free interest rate |  |  | 4.06 | % |  |  | 3.62 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Expected volatility of Cardiff Oncology common stock |  |  | 106 | % |  |  | 109 | %
Expected term |  | 5.8 years |  |  | 5.3 years |
Summary of Stock Option Activity and of Changes in Stock Options Outstanding | A summary of stock option activity and changes in stock options outstanding is presented below:
|  | Total Options |  |  | Weighted-Average Exercise Price Per Share |  |  | Intrinsic Value |
Balance outstanding, December 31, 2023 |  |  | 6,650,954 |  |  | $ | 4.27 |  |  | $ | 23,926 |
Granted |  |  | 1,899,096 |  |  | $ | 3.40 |  |  |  |
Exercised |  |  | (133,614 | ) |  | $ | 2.69 |  |  |  |
Forfeited and expired |  |  | (68,092 | ) |  | $ | 23.06 |  |  |  |
Balance outstanding, September 30, 2024 |  |  | 8,348,344 |  |  | $ | 3.94 |  |  | $ | 2,542,885 |
Exercisable at September 30, 2024 |  |  | 4,431,853 |  |  | $ | 4.64 |  |  | $ | 1,235,936 |
Vested and expected to vest at September 30, 2024 |  |  | 8,132,900 |  |  | $ | 3.97 |  |  | $ | 2,451,731 |
Summary of Warrant Activity and Changes in Warrants Outstanding | A summary of warrant activity and changes in warrants outstanding, classified as equity is presented below:
|  | Total Warrants |  |  | Weighted-Average Exercise Price Per Share |  |  | Weighted-Average Remaining Contractual Term
Balance outstanding, December 31, 2023 |  |  | 2,807,948 |  |  | $ | 2.45 |  |  | 1.9 years
Expired |  |  | (595 | ) |  | $ | 252.72 |  |  |
Balance outstanding, September 30, 2024 |  |  | 2,807,353 |  |  | $ | 2.40 |  |  | 1.2 years

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-1 + Details
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