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Derivative Financial Instruments - Warrants (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
$ / shares
Changes in the Company's derivative financial instruments liability balance      
Balance of warrants outstanding at the beginning of the period (in shares) | shares 5,260,992    
Balance of warrants outstanding at the end of the period (in shares) | shares 4,490,159    
Balance of derivative financial instruments liability at the beginning of the period $ 285    
Change in fair value of derivative financial instruments—warrants during the period recognized as a gain in the condensed statements of operations 207 $ 2  
Balance of derivative financial instruments liability at the end of the period $ 78    
Warrants to purchase Common Stock      
Range of assumptions used to determine the fair value of warrants      
Estimated fair value of Trovagene common stock (in dollars per share) | $ / shares $ 9.26   $ 17.99
Warrants to purchase Common Stock | Black Scholes Option Pricing Method      
Changes in the Company's derivative financial instruments liability balance      
Balance of warrants outstanding at the beginning of the period (in shares) | shares 64,496    
Balance of warrants outstanding at the end of the period (in shares) | shares 64,496    
Balance of derivative financial instruments liability at the beginning of the period $ 285    
Change in fair value of derivative financial instruments—warrants during the period recognized as a gain in the condensed statements of operations (207)    
Balance of derivative financial instruments liability at the end of the period $ 78    
Expected warrant term | Warrants to purchase Common Stock      
Range of assumptions used to determine the fair value of warrants      
Expected warrant term 1 year 9 months 18 days   2 years 2 months 12 days
Risk-free interest rate | Warrants to purchase Common Stock      
Range of assumptions used to determine the fair value of warrants      
Measurement input 0.0014   0.0013
Expected volatility of Cardiff Oncology common stock | Warrants to purchase Common Stock      
Range of assumptions used to determine the fair value of warrants      
Measurement input 1.21   1.16
Dividend yield | Warrants to purchase Common Stock      
Range of assumptions used to determine the fair value of warrants      
Measurement input 0   0