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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Company's Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
U.S. federal statutory rate 21.00% 21.00%
State income taxes, net of federal benefit, Tax Rate 6.00% 6.00%
Other permanent differences, Tax Rate 0.00% (1.00%)
Tax credits, Tax Rate 2.00% 2.00%
Other items, Tax Rate 0.00% 4.00%
Net change in valuation allowance, Tax Rate (29.00%) (32.00%)