Leases - Schedule of Components of Lease Expense and Related Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 51	$ 50	$ 152	$ 152
Short-term lease cost	7	30	36	88
Total Lease Cost	58	80	188	240
Operating cash flows used for operating leases	$ 53	$ 53	$ 157	$ 145