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Common Stock (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Apr. 20, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Warrants to purchase shares of common stock   22,902,240 19,323,195 22,902,240 19,323,195
Proceeds from warrants exercised       $ 775
Proceeds from stock options       $ 24
Stock Option [Member]          
Number of stock options shares exercised   2,500   22,497  
Proceeds from stock options   $ 3   $ 24  
Warrants [Member]          
Warrants to purchase shares of common stock   524,353 8,277,112 524,353 8,277,112
Proceeds from warrants exercised   $ 536 $ 83    
Warrants [Member] | Investors [Member]          
Warrants to purchase shares of common stock 4,787,553        
Warrant exercise price per share $ 1.55        
Warrant expiration date Apr. 20, 2022        
Warrants [Member] | Placement Agents [Member]          
Warrants to purchase shares of common stock 311,191        
Warrant exercise price per share $ 2.0888        
Warrant expiration date Apr. 20, 2022        
Warrants [Member] | Investors [Member]          
Warrant exercise price per share $ 0.64        
Warrants [Member] | Placement Agents [Member]          
Warrant exercise price per share $ 0.54        
Common Stock [Member]          
Number of common stock shares issued   437,999 8,277,112 944,746 8,974,612
Warrants One [Member]          
Warrants to purchase shares of common stock   1,147,184 8,974,612 1,147,184 8,974,612
Proceeds from warrants exercised       $ 775 $ 153
Registered Direct Offering [Member]          
Common stock shares sold 4,787,553        
Sale of stock price per share $ 1.671        
Proceeds from sale of stock $ 8,000        
Deducting fees and expenses $ 686