Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Mar. 31, 2021	Sep. 30, 2021
Operating lease right-of-use  assets	$ 920		$ 1,010
Novato California [Member]
Additional operating lease term		3 years
Operating lease expiry date		Jul. 31, 2024
Operating lease right-of-use  assets	1,100
General and Administrative Expense [Member]
Operating lease rent payments	$ 100