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Income Taxes - Summary of Reconciliation of Statutory Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
United States statutory rate 21.00% 21.00% 21.00%
State tax, net of federal benefit 1.00% 4.20% 1.00%
Stock-based compensation (0.70%) (0.50%) (1.60%)
Officer compensation 1.50% (1.00%) (1.30%)
Deferred rate change 0.00% 0.00% 0.00%
R&D credit 1.40% 0.80% 1.80%
PPP Loan 1.10% 0.00% 0.00%
Other 0.10% (0.10%) 0.30%
Change in valuation allowance (25.40%) (24.40%) (21.20%)
Effective income tax rate 0.00% 0.00% 0.00%