Balance Sheet Components - Summary of Accrued and Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Accrued research and development costs	$ 2,637	$ 1,715
Accrued employee related costs	1,917	4,359
Accrued professional fees	1,485	774
Operating lease liability	$ 214	$ 207
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherCurrentLiabilitiesMember	us-gaap:OtherCurrentLiabilitiesMember
Other	$ 111	$ 93
Total accrued and other liabilities	$ 6,364	$ 7,148