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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2023
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 March 31,
(in thousands) |  |  |  |  | 2023 |  | 2022
Included in research and development expense |  |  |  |  | $ | 394 |  |  | $ | 335 |
Included in selling, general and administrative expense |  |  |  |  | 670 |  |  | 817 |
Total stock-based compensation expense |  |  |  |  | $ | 1,064 |  |  | $ | 1,152 |
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:
| Three Months Ended March 31,
| 2023 |  | 2022
Risk-free interest rate | 3.58 | % |  | 1.84 | %
Dividend yield | 0 | % |  | 0 | %
Expected volatility of Cardiff Oncology common stock | 110 | % |  | 106 | %
Expected term(1) | 5.3 years |  | 6.0 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, 2022 | 5,069,458 |  |  | $ | 5.92 |  |  | $ | 19,322 |
Granted | 1,806,008 |  |  | $ | 1.73 |  |  |
Canceled / Forfeited | (1,725) |  |  | $ | 7.98 |  |  |
Expired | (476,846) |  |  | $ | 6.93 |  |  |
Balance outstanding, March 31, 2023 | 6,396,895 |  |  | $ | 4.66 |  |  | $ | 34,107 |
Exercisable at March 31, 2023 | 2,427,304 |  |  | $ | 6.57 |  |  | $ | 20,517 |
Vested and expected to vest at March 31, 2023 | 6,187,656 |  |  | $ | 4.73 |  |  | $ | 33,160 |
Summary of Warrant Activity and Changes in Warrants Outstanding | A summary of warrant activity and changes in warrants outstanding, including both liability and equity classifications is presented below:
| Total Warrants |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Term
Balance outstanding, December 31, 2022 | 4,360,968 |  |  | $ | 5.33 |  |  | 2.1 years
Expired | (64,496) |  |  | $ | 101.52 |  |  |
Balance outstanding, March 31, 2023 | 4,296,472 |  |  | $ | 3.89 |  |  | 1.8 years
Schedule of Preferred Stock | A summary of our Company's classes of preferred stock is presented below:
|  |  |  |  |  |  |  | Shares outstanding
Class |  | Par value |  | Shares designated |  |  |  | As of March 31, 2023 |  | As of December 31, 2022
Series A Convertible Preferred Stock |  | $ | 0.001 |  |  | 277,100 |  |  |  |  | 60,600 |  |  | 60,600 |
Series B Convertible Preferred Stock |  | $ | 0.001 |  |  | 8,860 |  |  |  |  | — |  |  | — |
Series C Convertible Preferred Stock |  | $ | 0.001 |  |  | 200,000 |  |  |  |  | — |  |  | — |
Series D Convertible Preferred Stock |  | $ | 0.0001 |  |  | 154,670 |  |  |  |  | — |  |  | — |
Series E Convertible Preferred Stock |  | $ | 0.001 |  |  | 865,824 |  |  |  |  | — |  |  | — |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21488-112644 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21506-112644 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21484-112644 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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