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Stockholders' Equity (Details) - USD ($)
3 Months Ended
Mar. 22, 2018
Jan. 12, 2018
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity [Abstract]        
Sale of stock, number of shares issued in transaction 2,743,640 4,000,000    
Sale of stock, price per share $ 1.10 $ 1.00    
Net proceeds from issuance of common stock and warrants $ 2,800,000 $ 3,400,000    
Proceeds from equity offerings, gross $ 3,000,000 $ 4,000,000    
Proceeds from exercises of warrants     $ 5,000 $ 198,000