Basis of Presentation - Additional Information (Detail)		3 Months Ended			6 Months Ended		9 Months Ended
	Mar. 14, 2019	Jun. 30, 2019 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Jun. 30, 2019 $ / shares	Jun. 30, 2018 $ / shares	Sep. 30, 2018 $ / shares
Basis Of Presentation [Line Items]
Basic earnings (loss) per share		$ 0.12		$ (12.04)	$ 2.04	$ (8.26)
Diluted earnings (loss) per share		$ 0.12		$ (12.04)	$ 0.08	$ (8.26)
Reverse stock split	1-for-10 reverse stock split
Stock split, conversion ratio	0.10
Adjustments
Basis Of Presentation [Line Items]
Basic earnings (loss) per share			$ 2.81				$ (4.87)
Diluted earnings (loss) per share			$ 0.26				$ (7.35)