Balance Sheet Information - Summary of Long-term Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Liabilities Noncurrent [Abstract]
Operating leases	$ 4,028	$ 3,021
Deferred payroll taxes	318	0
Finance leases	111	164
Deferred revenue	83	119
Other	17	11
Total	$ 4,557	$ 3,315