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Income Taxes - Schedule of Reconciliation of Effective Tax Rate of Provision for Income Taxes Differs from Federal Statutory Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Statutory rate 21.00% 21.00% 21.00%
State tax 13.80% 8.10% 5.50%
Stock compensation 25.20% 9.80% 0.50%
Permanent items (0.10%) (1.00%) 0.50%
Credits 5.70% 6.10% 2.70%
Other 0.50% 0.30% 0.10%
Change in valuation allowance (66.10%) (44.30%) (30.30%)
Total 0.00% 0.00% 0.00%