Annual report pursuant to Section 13 and 15(d)

Balance Sheets (Parenthetical)

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Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
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 10,146,000 9,958,000
Common stock, shares outstanding 9,681,000 9,601,000
Treasury stock, shares at cost 465,000 357,000