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Derivative Financial Instruments - Warrants (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
Dec. 31, 2018
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 12,329,435   12,329,435    
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 $ (44,144) $ 23,789 (42,037) $ 14,028  
Balance of derivative financial instruments liability at the end of the period $ 46,164   $ 46,164    
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 $ 5.01        
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     42,037    
Balance of derivative financial instruments liability at the end of the period $ 46,164   $ 46,164    
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 $ 2.50  
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     $ 5.01 $ 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 7 months 6 days   2 years 7 months 6 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 7 months 6 days 3 years 7 months 6 days 2 years 7 months 6 days 3 years 7 months 6 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 0.0017   0.0017    
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 0.0017 0.0172 0.0017 0.0172  
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 1.18   1.18    
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 1.11 1.02 1.11 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