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UNAUDITED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Convertible redeemable preferred stock, shares issued 7,000,000 7,000,000
Convertible redeemable preferred stock, shares outstanding 7,000,000 7,000,000
Convertible redeemable preferred stock, liquidation and deemed liquidation preference $ 3,500,000 $ 3,500,000
Series E Preferred Stock, par value (in dollars per share) $ 0.001 $ 0.001
Series E Preferred Stock, shares authorized 16,500,000 16,500,000
Series E Preferred Stock, shares issued 7,154,997
Series E Preferred Stock, shares outstanding 7,154,997
Series E Preferred Stock, liquidation preference   $ 12,521,245
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 1,500,000,000 1,500,000,000
Common stock, shares issued 61,964,057 53,918,523
Common stock, shares outstanding 61,964,057 53,918,523