Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Operating lease impairment charge		$ 106
California [Member]
Loss Contingencies [Line Items]
Operating lease agreement term		48 months
Operating lease agreement expiration date	Apr. 30, 2025
Vancouver [Member]
Loss Contingencies [Line Items]
Operating lease agreement expiration date	Feb. 28, 2023
Annual sublease base rent	$ 200
Future sublease base rent	$ 200
Operating lease impairment charge		$ 100
Weighted-average remaining lease term, operating leases (Year)	2 years 10 months 24 days
Weighted-average discount rate, Operating leases	4.70%