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Equity Incentive Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Total shares reserved | 49,658,733 | 46,402,832
Weighted average grant date fair value | $ 2.54 | $ 1.97
Fair value of vested options | $ 2.8 | $ 5.1
Equity Incentive Plan 2016 |  |
Expiration period of share-based payment award | 4 years |
Shares available for future grants under the 2016 Plan | 3,405,908 | 2,368,160
Maximum | Equity Incentive Plan 2016 |  |
Expiration period of share-based payment award | 10 years |
Equity Incentive Plan 2016 |  |
Percentage of annual increase in number of shares | 5.00% |
Shares available for future grants under the 2016 Plan | 3,405,908 |
Employee Stock Purchase Plan 2016 |  |
Percentage of annual increase in number of shares | 1.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | 30,000 |
Additional awards | 0 |
Total shares reserved | 11,890 |
Employee Stock Option |  |
Common stock closing price | $ 1.85 |
Stock Options And Restricted Stock Awards |  |
Unrecognized compensation cost related to unvested options | $ 2.6 |
Weighted-average remaining period for recognition of compensation costs related to unvested options | 1 year 10 months 24 days |
Restricted stock awards | Minimum |  |
Vesting period of share-based compensation award | 2 years |
Restricted stock awards | Maximum |  |
Vesting period of share-based compensation award | 4 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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