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Stock-based Compensation (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 19, 2019 | Jun. 01, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options to purchase, Granted (in shares) |  |  | 80,000 |  |
Stock-based compensation expense |  |  | $ 143,000 | $ 75,000 |
David Ludwig And Tom Ludwig [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted common stock granted |  | 600,000 |  |  |
Napier Park [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Warrants received to acquire shares of common stock with fair market value | $ 71,368 |  | 0 |  | $ 0
Incremental amount in excess of cumulative gross profit | 500,000 |  |  |  |
Cumulative gross profit of warrants | $ 2,500,000 |  |  |  |
Common Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | 100,000 |  |
Unrecognized stock-based compensation |  |  | $ 700,000 |  |
Unrecognized stock-based compensation, Period for recognition |  |  | 3 years 2 months 12 days |  |
Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 12,900 |  |
Weighted average grant date fair value |  |  | $ 0.43 |  |
Unrecognized stock-based compensation expense |  |  | $ 100,000 |  |
Restricted Stock [Member] | David Ludwig And Tom Ludwig [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares restriction term of service |  | 5 years |  |  |
Employees [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options to purchase, Granted (in shares) |  |  | 30,000 |  |
Non-Employee Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options to purchase, Granted (in shares) |  |  | 50,000 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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