Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested share-based compensation arrangements	$ 900			$ 900
Unrecognized compensation cost, period for recognition				1 year 8 months 12 days
Share-based compensation expense	$ 400	$ 700		$ 800	$ 1,400
Amounts remitted for employee withholding taxes				$ 1	73
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld	1,490	29,276	847
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period				1 year
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts remitted for employee withholding taxes				$ 1	$ 30
Restricted Stock Units [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld				1,490	29,276
Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period				3 years
Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vesting period				5 years