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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 14, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 31, 2020
Stock-based compensation |  |  |  |  |
Common stock, shares issued |  | 9,422,089 | 9,993,135 |  |
Options granted (in shares) |  | 522,337 | 552,153 |  |
Warrant & stock option exercises (in shares) |  | 0 | 6,600 |  |
Remaining unrecognized compensation cost of non-vested stock options |  | $ 2,000 |  |  |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost |  | 1 year 4 months 24 days |  |  |
Excess income tax benefits |  | $ 0 | $ 0 |  |
Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Options granted, grant date fair value |  | $ 1.76 |  |  |
Stock awards vesting period |  | 3 years |  |  |
Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Options granted, grant date fair value |  |  | $ 3.36 |  |
Stock awards vesting period |  | 4 years |  |  |
Board Director [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  | 1 year |  |  |
Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Options granted (in shares) |  | 522,337 | 552,153 |  |
Warrant & stock option exercises (in shares) |  |  | 6,600 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted Stock Units outstanding/unvested |  | 137,657 | 18,992 | 16,524 |
Restricted stock units, grant date fair value |  | $ 1.88 | $ 6.69 | $ 11.30 |
Restricted Stock Units, Granted |  | 118,665 | 18,992 |  |
Vested stock units |  | 17,409 |  |  |
Restricted Stock Units (RSUs) | Employees |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  | 3 years | 3 years |  |
Restricted Stock Units (RSUs) | Board Director [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  | 1 year | 1 year |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of additional shares authorized | 500,000 |  |  |  |
Number of shares reserved for issuance |  | 392,396 |  |  |
Life of stock option awards granted |  | 10 years |  |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  | 1 year |  |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  | 4 years |  |  |
Inducement Equity Incentive Plan 2020 [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of authorized shares |  |  |  |  | 200,000
Number of shares reserved for issuance |  | 80,000 |  |  |
Common stock, shares issued |  | 120,000 |  |  |

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