Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Statutory U.S. Federal Rate to Company's Effective Tax Rate (Detail)

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Income Taxes - Summary of Reconciliation of Statutory U.S. Federal Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Federal income tax benefit at statutory rate (21.00%) (21.00%) (21.00%)
State income tax, net of federal benefit (9.09%) (15.09%) (5.64%)
Permanent items including change in fair value of warrants (5.35%) (21.87%) 4.80%
Change in valuation allowance 37.88% 62.56% 23.95%
R&D tax credits (2.43%) (4.72%) (2.11%)
Other (0.01%) 0.12% 0.00%
Effective income tax (benefit) expense rate 0.00% 0.00% 0.00%