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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2025
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)

 

2025

 

 

2024

 

Included in research and development expense

 

$

515

 

 

$

389

 

Included in selling, general and administrative
   expense

 

 

850

 

 

 

735

 

Total stock-based compensation expense

 

$

1,365

 

 

$

1,124

 

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,

 

 

 

2025

 

 

2024

 

Risk-free interest rate

 

 

4.06

%

 

 

4.04

%

Dividend yield

 

 

0

%

 

 

0

%

Expected volatility of Cardiff Oncology common stock

 

 

106

%

 

 

107

%

Expected term

 

6.1 years

 

 

5.8 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, 2024

 

 

8,334,765

 

 

$

3.88

 

 

$

11,668,989

 

Granted

 

 

2,490,202

 

 

$

3.58

 

 

 

 

Exercised

 

 

(1,672

)

 

$

1.72

 

 

 

 

Forfeited and expired

 

 

(223

)

 

$

516.96

 

 

 

 

Balance outstanding, March 31, 2025

 

 

10,823,072

 

 

$

3.80

 

 

$

4,704,171

 

Exercisable at March 31, 2025

 

 

5,448,050

 

 

$

4.35

 

 

$

2,995,890

 

Vested and expected to vest at March 31, 2025

 

 

10,549,833

 

 

$

3.82

 

 

$

4,590,620

 

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, 2024

 

 

2,807,353

 

 

$

2.40

 

 

0.9 years

Balance outstanding, March 31, 2025

 

 

2,807,353

 

 

$

2.40

 

 

0.7 years