Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred stock, authorized shares (in shares) 20,000,000 20,000,000
Preferred stock, outstanding shares (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, issued shares (in shares) 248,037,301 246,660,367
Common stock, outstanding shares (in shares) 248,037,301 246,660,367