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CONDENSED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 44,997,279 38,478,560
Common stock, shares outstanding 44,997,279 38,478,560
Convertible Preferred Stock    
Convertible Preferred stock, par value $ 0.00001 $ 0.00001
Convertible Preferred stock, shares authorized 10,000,000 10,000,000
Convertible Preferred stock, shares issued 0 0
Convertible Preferred stock, shares outstanding 0 0