Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Sep. 30, 2019
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Class A Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 32,705,418 32,597,736
Common stock, shares outstanding (in shares) 32,705,418 32,597,736
Class B Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 21,999,279 22,106,961
Common stock, shares outstanding (in shares) 19,076,327 19,184,009
Treasury stock, shares (in shares) 2,922,952 2,922,952