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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2023
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders’ Equity Stock Options 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 |
The unrecognized compensation cost related to non-vested stock options outstanding at March 31, 2023, net of estimated forfeitures, was $10.1 million, which is expected to be recognized over a weighted-average remaining vesting period of 2.7 years. The weighted-average remaining contractual term of outstanding options as of March 31, 2023, was approximately 8.5 years. The total fair value of stock options vested during the three months ended March 31, 2023 and 2022, were $1.9 million and $1,000, respectively. 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
(1)The expected term for options granted after January 1, 2023 is estimated based on the Company's historical employee data. Prior to January 1, 2023, the Company used the "simplified method" to estimate expected term. 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 |
2021 Equity Incentive Plan In June 2021 the Company's stockholders approved the 2021 Omnibus Equity Incentive Plan ("2021 Plan"). The number of authorized shares in the 2021 Plan is equal to the sum of (i) 3,150,000 shares, plus (ii) the number of shares of Common Stock reserved, but unissued under the 2014 Plan; and (iii) the number of shares of Common Stock underlying forfeited awards under the 2014 Plan. On June 9, 2022, the shareholders approved an increase of shares authorized in the 2021 Plan to 5,150,000 from 3,150,000. As of March 31, 2023, there were 2,180,898 shares available for issuance under the 2021 Plan. 2014 Equity Incentive Plan Subsequent to the adoption of the 2021 Plan, no additional equity awards can be made under the terms of the 2014 Plan. Inducement Grants The Company issues equity awards to certain new employees as inducement grants outside of its 2021 Plan. As of March 31, 2023, an aggregate of 1,345,208 shares were issuable upon the exercise of inducement grant stock options approved by the Company. Warrants 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
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 The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI https://asc.fasb.org/topic&trid=2208762 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -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 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126731327&loc=SL126733271-114008 + Details
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