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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options outstanding |  | 2,657,333 |  | 2,657,333 |  | 1,473,359
Stock-based compensation expense |  | $ 474 | $ 31 | $ 1,159 | $ 95 |
Expected dividend yield |  |  |  | 0.00% |  |
Exercise of stock options (in shares) |  |  |  | 11,783 |  |
2001 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reserved for future issuance | 2,674,749 |  |  |  |  |
Number of shares available for grant |  | 600,373 |  | 600,373 |  |
Vesting Period | 4 years |  |  |  |  |
2001 Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Period | 10 years |  |  |  |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reserved for future issuance |  | 278,170 |  | 278,170 |  |
Shares issued/purchased under ESPP |  |  |  | 0 |  |
Annual incremental percentage |  | 1.00% |  | 1.00% |  |
Minimum Percentage |  | 85.00% |  | 85.00% |  |
2021 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reserved for future issuance |  | 1,854,490 |  | 1,854,490 |  |
Number of shares available for grant |  | 1,791,888 |  | 1,791,888 |  |
Annual incremental percentage |  | 5.00% |  | 5.00% |  |
2021 | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based payment award, term |  |  |  | 10 years |  |
Options to purchase common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options outstanding |  | 9,993 |  | 9,993 |  |
Options to purchase common stock | 2001 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Period |  |  |  | 48 months |  |
Stock options with early exercise option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 0 | 0 |
Liability recorded |  | $ 0 | $ 0 | $ 0 | $ 0 |
Performance based shares contingent on certain milestones |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Period |  |  |  | 48 months |  |
Performance stock options outstanding |  | 10,493 |  | 10,493 |  |
Stock-based compensation expense |  |  |  | $ 0 |  |

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