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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2022

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 June 30,												Six Months Ended June 30,
(in thousands)			2022						2021						2022						2021
Included in research and development expense			$	126					$	72					$	460					$	112
Included in selling, general and administrative expense			929						964						1,747						1,192
Total stock-based compensation expense			$	1,055					$	1,036					$	2,207					$	1,304

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:

			Six Months Ended June 30,
			2022						2021
Risk-free interest rate			1.87		%				0.94		%
Dividend yield			0		%				0		%
Expected volatility of Cardiff Oncology common stock			106		%				108		%
Expected term			6.0 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, 2021			3,771,984						$	7.13					$	6,405,258
Granted			1,731,136						$	3.15
Canceled / Forfeited			(371,125)						$	4.77
Expired			(800)						$	165.84
Balance outstanding, June 30, 2022			5,131,195						$	5.93					$	80,809
Exercisable at June 30, 2022			2,030,219						$	7.49					$	34,443
Vested and expected to vest at June 30, 2022			5,042,299						$	5.95					$	77,880

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, 2021			4,490,159						$	5.80					3.0 years
Balance outstanding, June 30, 2022			4,490,159						$	5.80					2.5 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						Liquidation preference						As of June 30, 2022						As of December 31, 2021
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						None						327,509						655,044

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