Leases - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lease description	The Company leases facilities for research, office, manufacturing and warehousing.
Lease, existence of option to extend	true
Lease, option to extend	The Company’s leases include one or more options to renew and extend the lease term at the Company’s discretion. These renewal options are not included in our right-of-use assets and lease liabilities as they are not reasonably certain of exercise.
Operating lease cost	$ 0.1
Weighted average remaining lease term for operating leases	8 years 2 months 12 days
Weighted average discount rate used to determine operating lease liabilities	4.60%