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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2020
Stock-based compensation |  |  |  |
Excess income tax benefits | $ 0 | $ 0 |  |
Minimum |  |  |  |
Stock-based compensation |  |  |  |
Stock awards vesting period | 3 years |  |  |
Maximum |  |  |  |
Stock-based compensation |  |  |  |
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) | 552,153 | 511,800 |  |
Warrant & stock option exercises (in shares) | 6,600 | 0 |  |
Remaining unrecognized compensation cost of non-vested stock options | $ 2,500 |  |  |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost | 2 years 4 months 13 days |  |  |
Stock options | Minimum |  |  |  |
Stock-based compensation |  |  |  |
Options granted, grant date fair value | $ 3.36 |  |  |
Stock options | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Options granted, grant date fair value |  | $ 3.47 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based compensation |  |  |  |
Restricted Stock Units outstanding/unvested | 18,992 | 16,524 |  |
Restricted stock units, grant date fair value | $ 6.69 | $ 11.30 |  |
Restricted Stock Units, Granted | 18,992 | 3,938 | 14,000 |
Stock units forfeited |  | 1,491 |  |
Restricted Stock Units (RSUs) [Member] | Minimum |  |  |  |
Stock-based compensation |  |  |  |
Stock awards vesting period | 1 year |  |  |
Restricted Stock Units (RSUs) [Member] | Maximum |  |  |  |
Stock-based compensation |  |  |  |
Stock awards vesting period | 3 years |  |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] |  |  |  |
Stock-based compensation |  |  |  |
Number of shares reserved for issuance | 522,294 |  |  |
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 |  |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Stock options |  |  |  |
Stock-based compensation |  |  |  |
Options granted (in shares) | 552,153 | 391,800 |  |
Inducement Equity Incentive Plan 2020 [Member] |  |  |  |
Stock-based compensation |  |  |  |
Number of shares reserved for issuance | 80,000 |  |  | 200,000
Options granted (in shares) | 120,000 | 120,000 |  |

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