Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Effective income tax rate reconciliation | ||
| Federal income tax expense at statutory rate | 21.00% | 21.00% |
| State taxes—net of federal benefit | 5.00% | 5.00% |
| Change in fair value of preferred stock tranche obligations | 0.00% | 0.00% |
| Permanent differences and other | (1.00%) | (0.00%) |
| Federal & state R&D credits | 2.00% | 1.00% |
| Increase in valuation allowance | (27.00%) | (27.00%) |
| Effective income tax rate | 0.00% | 0.00% |