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Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
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 9,958,448 9,616,992
Common stock, shares outstanding 9,601,134 9,481,992
Treasury stock, shares at cost 357,314 135,000