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Preferred Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | May 28, 2020 | Oct. 31, 2019 | Oct. 25, 2019 | Sep. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Mar. 30, 2020
--- | --- | --- | --- | --- | --- | --- | ---
Private Placement [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Aggregate offering price |  |  | $ 25 |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Issuance of preferred stock |  |  |  | 0 | 0 |  |
Aggregate value |  |  |  |  |  |  |
Shares issued upon conversion | 12,607 |  |  |  |  |  |
Preferred stock, par value |  |  |  | $ 0.01 | $ 0.01 |  |
Number of outstanding shares |  |  |  |  |  | 12,607 | 12,337
Series C Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Issuance of preferred stock |  | 12,337 |  |  |  |  |
Purchase price per share |  | $ 1,200.00 |  |  |  |  |
Shares upon conversion |  |  |  |  |  |  | 270
Preferred stock, par value |  | $ 0.01 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.01 | $ 0.01 |  |
Shares authorized |  |  |  | 9,090,909 | 9,090,909 |  |
Number of shares exchange |  |  |  |  |  |  | 27,000
Common Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Shares sold |  | 849,615 |  |  |  |  |
Purchase price per share |  | $ 12.00 |  |  |  |  |
Non-Voting Common Stock [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Shares issued upon conversion | 1,260,700 |  |  |  |  |  |
Shares upon conversion | 100 |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.01 | $ 0.01 |  |
Shares authorized | 1,260,700 |  |  | 1,260,700 | 1,260,700 |  |
Non-Voting Common Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Shares upon conversion |  |  | 100 |  |  |  |
Common stock, par value |  |  | $ 0.01 |  |  |  |

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