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Condensed Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2018
Feb. 12, 2018
Dec. 31, 2017
Preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0   0
Preferred stock, shares outstanding (in shares) 0   0
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 100,000,000 100,000,000 20,000,000
Common stock, shares, issued (in shares) 27,274,991   16,527,000
Common stock, shares, outstanding (in shares) 27,274,991   16,527,000
Convertible Preferred Stock      
Preferred stock, par value (in dollars per share) $ 0.00001   $ 0.00001
Preferred stock, shares authorized (in shares) 0   2,500,000
Preferred stock, shares issued (in shares) 0   1,250,000
Preferred stock, shares outstanding (in shares) 0   1,250,000