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Stockholders' Equity
6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(in thousands)2021202020212020
Included in research and development expense$72 $70 $112 $147 
Included in selling, general and administrative expense964 212 1,192 312 
Total stock-based compensation expense$1,036 $282 $1,304 $459 
 
The unrecognized compensation cost related to non-vested stock options outstanding at June 30, 2021, net of estimated forfeitures, was $7.9 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 June 30, 2021 was approximately 8.9 years. The total fair value of stock options vested during the six months ended June 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:
 
Six Months Ended June 30,
20212020
Risk-free interest rate0.94 %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 
Granted1,117,106 $7.98  
Canceled / Forfeited(10,770)$2.55  
Balance outstanding, June 30, 20212,966,843 $7.65 $7,439,918 
Exercisable at June 30, 20211,282,401 $9.65 $5,076,084 
Vested and expected to vest at June 30, 20212,886,407 $7.72 $7,262,361 
 
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 June 30, 2021, there were 2,304,110 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.

Modification of Stock Options

In June 2021 two of the Company's directors left the Board of Directors. At the time of departure, the Compensation Committee passed a resolution to extend the expiration date of both 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 expense of $0.6 million during the three months ended June 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, June 30, 2021— $— $— 

The total fair value of vested RSUs during the six months ended June 30, 2021 and 2020 were $72 thousand and $99 thousand, 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, June 30, 20214,490,159 $5.80 3.5 years


Preferred Stock

A summary of our Company's classes of preferred stock is presented below:
Shares outstanding
ClassPar valueShares designatedLiquidation preferenceAs of June 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 

Sale of Common Stock
During May 2021, the Company sold 2.0 million shares of its common stock under the Sales Agreement with Jefferies LLC.