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Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Warrants [Line Items]    
Exercise price (USD/share) $ 1,230,000  
Stock options [Member]    
Warrants [Line Items]    
Market price per share (USD/share) 1.23 $ 1.13
Exercise price (USD/share) $ 2.20 $ 2.20
Risk free rate 1.86% 2.60%
Dividend yield 0.00% 0.00%
Expected term/Contractual life (years) 6 years 9 months 18 days 7 years 3 months 19 days
Expected volatility 262.47% 256.20%