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Common Stock, Warrant, Preferred Stock and Dividends - Summary of preferred and common shares (Details) - $ / shares
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]    
Preferred stock, shares authorized 16,000,000 16,000,000
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares issued    
Preferred stock, shares outstanding    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock-Class A    
Class of Stock [Line Items]    
Common stock, shares authorized 300,000,000 300,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares issued 17,747,793 17,442,953
Common stock, shares outstanding 17,747,793 17,442,953
Common stock-Class B    
Class of Stock [Line Items]    
Common stock, shares authorized 30,000,000 30,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares issued 21,320,275 21,348,600
Common stock, shares outstanding 21,320,275 21,348,600