Leases - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020 USD ($) Lease	Sep. 30, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in measurement of lease liabilities	$ 276,000
Operating leases expense	$ 442,000	$ 240,000
Operating lease, number of leases | Lease	3
Lessor, operating lease, option to extend	One lease is extended on a month-to-month basis while two of these leases have arrangements for over twelve months with an option to extend the lease terms.
Rent income on operating leases per month	$ 6,000
Financing lease obligation	0
Finance lease right of use asset	$ 0