Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Income Taxes at Statutory Federal Income Tax Rate to Net Income Taxes (Detail)

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Income Taxes - Schedule of Reconciliation of Income Taxes at Statutory Federal Income Tax Rate to Net Income Taxes (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
U.S. federal taxes (benefit) at statutory rate $ (14,578,000) $ (6,361,000)
State federal income tax benefit (528,000) (69,000)
Permanent differences 34,000 (160,000)
Stock compensation 4,112,000 136,000
Research and development credits (1,677,000) (608,000)
Change in valuation allowance due to operations 12,756,000 2,758,000
Expiring state carryovers and other (119,000) 4,304,000
Total $ 0 $ 0