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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Preferred stock, par value ($ per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (shares) 10,000,000 10,000,000
Preferred stock, shares issued (shares) 23 23
Preferred stock, shares outstanding (shares) 23 23
Common stock, par value ($ per share) $ 0.001 $ 0.001
Common stock, shares authorized (shares) 600,000,000 600,000,000
Common stock, shares issued (shares) 97,225,810 90,357,644
Common stock, shares (shares) 97,225,810 90,357,644