Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Reconciliation of Statutory Income Tax Rate (Detail)

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Income Taxes - Summary of Reconciliation of Statutory Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]      
United States statutory rate 21.00% 21.00% 34.00%
State Tax, net of Federal Benefit 1.00% 0.70%  
Stock-based compensation (1.60%) 3.60% 0.60%
Officers compensation (1.30%)    
Deferred rate change   0.30% (12.90%)
R&D credit 1.80% 0.70%  
Other 0.30% 0.70%  
Change in valuation allowance (21.20%) (27.00%) (21.70%)