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Condensed Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2020
Dec. 31, 2019
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 10,188,000 10,146,000
Common stock, shares outstanding 9,654,000 9,681,000
Treasury stock, shares at cost 534,000 465,000