Leases - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2022	Sep. 30, 2021
Additional operating lease term	3 years
Operating lease right-of-use  assets	$ 740	$ 1,010
Novato California [Member]
Operating lease expiry date	Jul. 31, 2024
Operating lease right-of-use  assets	$ 1,100
General and Administrative Expense [Member]
Operating lease rent payments	$ 400