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Condensed Balance Sheets (Parenthetical) (Unaudited) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 17,427,533 15,413,610
Common stock, shares outstanding 17,427,533 15,413,610