Leases - Summary of Information Relating to Lease Term and Discount Rate (Detail)	Sep. 30, 2021	Sep. 30, 2020
Weighted average remaining lease term (in months)
Operating leases	29 months 27 days	21 months 3 days
Finance leases	32 months 6 days	44 months 6 days
Weighted average discount rate
Operating leases	7.50%	7.50%
Finance leases	7.50%	7.50%