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Common Stock, Preferred Stock and Dividends - Summary of preferred and common shares (Details) - $ / shares
Jun. 30, 2018
Jun. 30, 2017
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 0 0
Preferred stock, shares outstanding 0 0
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 19,992,204 19,249,132
Common stock, shares outstanding 19,992,204 19,249,132
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 20,365,504 20,626,836
Common stock, shares outstanding 20,365,504 20,626,836