Income Taxes - Reconciliation Between Income Taxes at Statutory Tax Rate (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Income Taxes | ||
| Loss before income taxes | $ (10,440) | $ (10,882) |
| Tax (benefit) at statutory tax rate | (2,193) | (2,285) |
| Effects of: | ||
| Exclusion of incentive stock option expense | 73 | 50 |
| R&D tax credits | (451) | (832) |
| Increase (decrease) in valuation allowance | 2,648 | 2,990 |
| Other | (77) | 77 |
| Provision for income taxes | 0 | 0 |
| Unrecognized tax benefits | 0 | |
| Unrecognized tax benefits, interest and penalties recorded | 0 | |
| Unrecognized tax benefits, interest and penalties accrued | $ 0 | $ 0 |