Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
U.S., foreign and state net operating loss carryforwards	$ 57,705	$ 33,594
Research and development credits	4,383	1,716
Capitalized start up and organizational costs	29	32
Equity based compensation	2,944	543
Licensing agreements	4,004	1,756
Accruals and other	1,587	993
Total deferred tax assets	70,652	38,634
Valuation allowance	(70,492)	(38,425)
Net deferred tax assets	160	209
Deferred tax liabilities:
Property and equipment	$ (160)	(209)
Total deferred tax liabilities		$ 0