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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2019
Sep. 30, 2018
Treasury stock, shares, at cost 6,864,897 6,864,897
Common Stock    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 32,498,830 32,168,795
Common stock, shares outstanding 25,633,933 25,303,898
Series A Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 700,000 700,000
Preferred stock, shares outstanding 700,000 700,000
Preferred stock, liquidation preference (in dollars per share) $ 100 $ 100