Leases - Future Minimum Lease Payments Under Non-Cancellable Leases (Detail) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Operating Leases
Remainder of 2020	$ 652,000
2021	889,000
2022	849,000
2023	815,000
2024 and beyond	1,176,000
Total future minimum lease payments	4,381,000
Less imputed interest	(1,115,000)
Total	3,266,000	$ 3,379,000
Finance Leases
Remainder of 2020	42,000
2021	55,000
Total future minimum lease payments	97,000
Less imputed interest	(10,000)
Total	$ 87,000	$ 0