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Subsequent Events (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 13, 2019
Dec. 31, 2018
Mar. 26, 2019
Feb. 26, 2019
Mar. 16, 2018
Jul. 10, 2017
Conversion price per share   $ 0.20        
Number of warrant to purchase shares of common stock           130,000
Warrant exercise price per share         $ 0.3875  
Warrant exercisable term   5 years        
Funds realized from sale of securities in the rights offering   $ 4,690        
Received from rights offering   $ 4,690        
Subsequent Event [Member] | Maximum [Member]            
Closing price per share     $ 0.16 $ 0.20    
Average price per share     19.00%      
Subsequent Event [Member] | Iliad Research and Trading, L.P. [Member] | Secured Convertible Promissory Note [Member]            
Convertible notes maturity date extended term September 28, 2019 to September 28, 2020          
Maximum redeem limit per month $ 300,000          
Series B Convertible Preferred Stock [Member]            
Subscription price per unit   $ 1,000        
Face value   $ 1,000        
Warrant [Member]            
Number of warrant to purchase shares of common stock   5,000        
Warrant exercise price per share   $ 0.20