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Warrants - (Detail) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Class of Warrant or Right [Line Items]      
Warrant derivative liability $ 1,908,000   $ 2,064,000
Proceeds from warrant exercises $ 100,000 $ 350,000  
Warrants [Member]      
Class of Warrant or Right [Line Items]      
Exercise price $ 0.57   $ 0.57
Warrants exercised 250,000    
Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Exercise price $ 0.40    
Warrants exercised 250,000    
Proceeds from warrant exercises $ 100,000