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Stock-Based Compensation (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 director shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Oct. 31, 2020 shares
Minimum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  |  | 4 years |  |
Board Director [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  |  | 1 year |  |
Stock Options [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Options granted, grant date fair value | $ / shares |  |  | $ 3.47 | $ 11.51 |
Options granted (in shares) |  |  | 511,800 | 77,514 |
Stock option exercised (in shares) |  |  | 0 | 0 |
Number of former directors | director | 2 |  |  |  |
Number of accelerated stock options | 10,400 |  |  |  |
Excess income tax benefits | $ |  |  | $ 0 | $ 0 |
Modification charges recognized | $ |  | $ 20,000 |  |  |
Remaining unrecognized compensation cost of non-vested stock options | $ |  |  | $ 1,900,000 |  |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost |  |  | 2 years 7 months 28 days |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period | 1 year |  |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period | 3 years |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted Stock Units outstanding |  |  | 16,524 | 14,000 |
Stock units forfeited |  |  | 1,414 |  |
Vested stock units |  |  |  |  |
Compensation cost recognized | $ |  |  | $ 0 |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of authorized shares |  |  | 775,000 |  |
Number of additional shares authorized |  |  | 35,494 |  |
Number of shares reserved for issuance |  |  | 328,035 |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Minimum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  |  | 1 year |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Maximum [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock awards vesting period |  |  | 4 years |  |
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Stock Options [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Life of stock option awards granted |  |  | 10 years |  |
Options granted (in shares) |  |  | 391,800 | 77,514 |
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 |  |
Inducement Equity Incentive Plan 2020 [Member] | Stock Options [Member] |  |  |  |  |
Stock-based compensation |  |  |  |  |
Options granted (in shares) |  |  | 120,000 |  |

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