Quarterly report pursuant to Section 13 or 15(d)

CONDENSED BALANCE SHEETS (Parenthetical)

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CONDENSED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred stock, par value (dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (shares) 5,000,000 5,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (shares) 450,000,000 450,000,000
Common stock, shares outstanding (in shares) 293,600,269 66,791,633