Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Expected Statutory Federal Income Tax Provision to Actual Income Tax Provision (Detail)

v3.21.1
Income Taxes - Summary of Reconciliation of Expected Statutory Federal Income Tax Provision to Actual Income Tax Provision (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Income tax benefit at federal statutory tax rate $ (10,707) $ (21,589)
Change in valuation allowance 17,181 23,587
State income taxes, net of federal benefit (4,768) 3,810
Research credits (2,911) (6,555)
Cancelled options 982 315
Other 223 432
Income tax (benefit) expense $ 0 $ 0