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Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
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) 58,707,185 50,606,147
Common stock, outstanding shares (in shares) 57,707,185 50,606,147