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Stockholders' Equity
9 Months Ended
Sep. 30, 2021
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 September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Included in research and development expense$174 $104 $286 $251 
Included in selling, general and administrative expense766 258 1,958 570 
Total stock-based compensation expense$940 $362 $2,244 $821 
 
The unrecognized compensation cost related to non-vested stock options outstanding at September 30, 2021, net of estimated forfeitures, was $10.1 million, which is expected to be recognized over a weighted-average remaining vesting period of 3.3 years. The weighted-average remaining contractual term of outstanding options as of September 30, 2021 was
approximately 8.9 years. The total fair value of stock options vested during the nine months ended September 30, 2021 and 2020 were $1.2 million and $0.8 million, 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:
 
Nine Months Ended September 30,
20212020
Risk-free interest rate0.95 %0.44 %
Dividend yield%%
Expected volatility of Cardiff Oncology common stock108 %105 %
Expected term6.0 years5.9 years

A summary of stock option activity and changes in stock options outstanding is presented below:
 
Total OptionsWeighted-Average
Exercise Price
Per Share
Intrinsic
Value
Balance outstanding, December 31, 20201,860,507 $7.43 $27,963,363 
Granted1,721,314 $7.48  
Canceled / Forfeited(10,770)$2.55  
Expired(4,219)$216.00  
Balance outstanding, September 30, 20213,566,832 $7.22 $7,522,769 
Exercisable at September 30, 20211,281,604 $8.96 $5,103,890 
Vested and expected to vest at September 30, 20213,466,323 $7.28 $7,344,075 
 
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. As of September 30, 2021, there were 2,289,902 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

In July 2021, the Company began issuing equity awards to certain new employees as inducement grants outside of its 2021 Plan. As of September 30, 2021, an aggregate of 590,000 shares were issuable upon the exercise of inducement grant stock options approved by the Company.


Modification of Stock Options

In June 2021 two of the Company's directors' terms ended. At the conclusion of their term, the Compensation Committee passed a resolution to extend the expiration date of the departing directors vested stock options, and to immediately accelerate the vesting of one of the directors unvested options. The Company recorded incremental stock compensation expenses of$0.6 million during the nine months ended September 30, 2021, related to the modifications.
Restricted Stock Units

A summary of the RSU activity is presented below:
Total Restricted Stock UnitsWeighted-Average
Grant Date Fair Value
Per Share
Intrinsic Value
Non-vested RSUs outstanding, December 31, 2020491 $147.60 $8,833 
Vested(491)$147.60 
Non-vested RSUs outstanding, September 30, 2021— $— $— 

The total fair value of vested RSUs during the nine months ended September 30, 2021 and 2020 were $0.1 million and $0.1 million, respectively.

Warrants
 
A summary of warrant activity and changes in warrants outstanding, including both liability and equity classifications is presented below:
 
Total WarrantsWeighted-Average
Exercise Price
Per Share
Weighted-Average
Remaining Contractual
Term
Balance outstanding, December 31, 20205,260,992 $5.19 4.1 years
Exercised(770,833)$1.64 
Balance outstanding, September 30, 20214,490,159 $5.80 3.2 years


Preferred Stock

A summary of our Company's classes of preferred stock is presented below:
Shares outstanding
ClassPar valueShares designatedLiquidation preferenceAs of September 30,
2021
As of December 31,
2020
Series A Convertible Preferred Stock$0.001 277,100 $606,000 60,600 60,600 
Series B Convertible Preferred Stock$0.001 8,860 None— — 
Series C Convertible Preferred Stock$0.001 200,000 None— — 
Series D Convertible Preferred Stock$0.0001 154,670 None— — 
Series E Convertible Preferred Stock$0.001 865,824 None655,044 655,044