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Income Taxes - Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Statutory rate 21.00% 21.00%
State tax (1.30%) (0.10%)
Warrants, BCF, and other equity items (33.30%) (13.10%)
Valuation allowance 15.60% (6.40%)
Other (0.20%) (0.10%)
Foreign rate differential (0.20%) 0.20%
Stock-based compensation (1.60%) (1.50%)
Effective income tax rate 0.00% 0.00%