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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized shares (in shares) 125,000,000 125,000,000
Common stock, issued shares (in shares) 41,612,395 34,169,410
Common stock, outstanding shares (in shares) 41,612,395 34,169,410