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Derivative Financial Instruments - Warrants (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Mar. 31, 2019
Changes in the Company's derivative financial instruments liability balance          
Balance of warrants outstanding at the beginning of the period (in shares) | shares     10,589,482    
Balance of warrants outstanding at the end of the period (in shares) | shares 7,373,351   7,373,351    
Balance of derivative financial instruments liability at the beginning of the period     $ 4,127    
Change in fair value of derivative financial instruments—warrants during the period recognized as a loss in the condensed statements of operations $ (144,035) $ 13,330 (186,072) $ 27,359  
Balance of derivative financial instruments liability at the end of the period $ 190,199   $ 190,199    
Warrants to purchase Common Stock | Weighted Average          
Range of assumptions used to determine the fair value of warrants          
Estimated fair value of Trovagene common stock (in dollars per share) | $ / shares     $ 14.19    
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   64,496    
Balance of derivative financial instruments liability at the beginning of the period     $ 4,127    
Change in fair value of derivative financial instruments—warrants during the period recognized as a loss in the condensed statements of operations     186,072    
Balance of derivative financial instruments liability at the end of the period $ 190,199   $ 190,199    
Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Minimum          
Range of assumptions used to determine the fair value of warrants          
Estimated fair value of Trovagene common stock (in dollars per share) | $ / shares     $ 1.01 $ 1.51  
Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Maximum          
Range of assumptions used to determine the fair value of warrants          
Estimated fair value of Trovagene common stock (in dollars per share) | $ / shares     $ 14.19 $ 3.75  
Expected warrant term | Warrants to purchase Common Stock | Weighted Average          
Range of assumptions used to determine the fair value of warrants          
Expected warrant term 2 years 3 months 18 days   2 years 3 months 18 days    
Expected warrant term | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Minimum          
Range of assumptions used to determine the fair value of warrants          
Expected warrant term 2 years 3 months 18 days 3 years 3 months 18 days 2 years 3 months 18 days 3 years 3 months 18 days  
Expected warrant term | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Maximum          
Range of assumptions used to determine the fair value of warrants          
Expected warrant term 3 years 1 month 6 days 4 years 1 month 6 days 3 years 1 month 6 days 4 years 1 month 6 days  
Risk-free interest rate | Warrants to purchase Common Stock | Weighted Average          
Range of assumptions used to determine the fair value of warrants          
Measurement input 0.0014   0.0014    
Risk-free interest rate | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Minimum          
Range of assumptions used to determine the fair value of warrants          
Measurement input 0.0014 0.0156 0.0014 0.0156  
Risk-free interest rate | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Maximum          
Range of assumptions used to determine the fair value of warrants          
Measurement input 0.0162 0.0249 0.0162 0.0249  
Expected volatility of Cardiff Oncology common stock | Warrants to purchase Common Stock | Weighted Average          
Range of assumptions used to determine the fair value of warrants          
Measurement input 1.10   1.10    
Expected volatility of Cardiff Oncology common stock | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Minimum          
Range of assumptions used to determine the fair value of warrants          
Measurement input 1.10 1.02 1.10 1.02  
Expected volatility of Cardiff Oncology common stock | Warrants to purchase Common Stock | Black Scholes Option Pricing Method | Maximum          
Range of assumptions used to determine the fair value of warrants          
Measurement input 1.18 1.06 1.18 1.06  
Dividend yield | Warrants to purchase Common Stock | Weighted Average          
Range of assumptions used to determine the fair value of warrants          
Measurement input 0   0    
Dividend yield | Warrants to purchase Common Stock | Black Scholes Option Pricing Method          
Range of assumptions used to determine the fair value of warrants          
Measurement input 0   0   0