Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)

v3.21.1
Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Contingency [Line Items]    
Tax benefit at federal statutory rate (21.00%) (21.00%)
State income taxes (6.70%) (5.70%)
Permanent differences:    
Stock-based compensation 3.60% 3.10%
Meals and entertainment   0.10%
Executive compensation (1.20%) 1.00%
Change in effective tax rate (0.10%)  
Effective income tax rate 0.00% 0.00%
Domestic Tax Authority [Member]    
Permanent differences:    
Effective income tax rate reconciliation, prior year income taxes, percent   (1.30%)
Effective income tax rate reconciliation, tax credit, research, percent (2.00%) (2.10%)
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent 20.60% 20.20%
State and Local Jurisdiction [Member]    
Permanent differences:    
Effective income tax rate reconciliation, prior year income taxes, percent 0.10% (0.10%)
Effective income tax rate reconciliation, tax credit, research, percent (1.30%) (1.40%)
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, percent 8.00% 7.20%