Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Right-of-use asset	$ 3,055	$ 4,406
Current lease liability	2,227	1,712
Long-term lease liability	853	2,720
Total lease liability	$ 3,080	$ 4,432