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Condensed Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 975,000,000 975,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 15,722,420 12,515,201
Common stock, shares outstanding 15,722,420 12,515,201
Series B Convertible Preferred Stock [Member]    
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Preferred stock, liquidation preference per share $ 0.001 $ 0.001
Series C-1 Convertible Preferred Stock [Member]    
Preferred stock, shares issued 29,414 29,414
Preferred stock, shares outstanding 29,414 29,414
Preferred stock, liquidation preference per share $ 0.001 $ 0.001