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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Federal statutory tax rate (21.00%) (21.00%)
State income taxes, net of federal tax benefits (3.80%) (3.90%)
Research and development tax credits (1.20%) (0.50%)
Stock compensation 0.90% 1.00%
Non-deductible expenses 1.10% 1.10%
Change in valuation allowance 24.60% 22.60%
Other 0.00% 0.20%
Effective tax rate 0.60% (0.50%)