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Unaudited Condensed Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 9,577,530 9,275,062
Common stock, shares outstanding 9,525,330 9,275,062
Treasury stock, shares at cost 52,200 0