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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Common stock, par value (dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (shares) 4,990,000,000 4,990,000,000
Common stock, shares issued (shares) 428,289,216 427,940,440
Common stock, shares outstanding (shares) 428,289,216 427,940,440