Property and equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Total, at cost	$ 14,288	$ 13,442
Accumulated depreciation	(8,507)	(7,262)
Total, net	5,781	6,180
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Total, at cost	6,139	5,940
Lab equipment [Member]
Property Plant And Equipment [Line Items]
Total, at cost	6,066	5,709
Computer equipment [Member]
Property Plant And Equipment [Line Items]
Total, at cost	1,051	994
Furniture and office equipment [Member]
Property Plant And Equipment [Line Items]
Total, at cost	705	472
Vehicles [Member]
Property Plant And Equipment [Line Items]
Total, at cost	305	305
Asset under construction [Member]
Property Plant And Equipment [Line Items]
Total, at cost	$ 22	$ 22