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Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 200,000,000 200,000,000
Common stock, shares issued 18,602,000 17,744,000
Common stock, shares outstanding 18,602,000 17,744,000