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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 08, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2016 | Nov. 01, 2019
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared and paid |  |  |  |  |  |  | $ 587,000 | $ 587,000 |  |
Aggregate number of shares authorized to repurchase |  |  |  |  |  |  |  |  |  | 1,250,000
Approximate percentage of shares authorized to be repurchased |  |  | 3.30% |  |  |  |  |  |  |
Treasury shares |  | 118,486 |  | 118,486 |  |  | 118,486 |  |  |
Treasury shares, at cost |  | $ 1,668,000 |  | $ 1,700,000 |  |  | $ 1,668,000 |  |  |
Cash dividend declared | $ 0.03 |  |  |  |  |  |  |  |  |
Dividend payable date | Oct. 06, 2020 |  |  |  |  |  |  |  |  |
Dividends record date | Sep. 22, 2020 |  |  |  |  |  |  |  |  |
Dividends declared |  | 1,157,000 | $ 1,152,000 | $ 1,151,000 | $ 1,148,000 | $ 0 |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  | 7.50% |
Preferred stock, liquidation preference per share |  |  |  |  |  |  |  |  | $ 1,000 |
Preferred stock fixed dividend close date |  |  |  |  |  |  |  |  | Dec. 30, 2021 |
Preferred stock redemption price per share |  |  |  |  |  |  |  |  | $ 1,000 |
Dividends declared and paid |  | $ 196,000 |  |  |  | $ 196,000 | $ 587,000 | $ 587,000 |  |
Series B Preferred Stock | Three-month LIBOR |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  | 5.41% |

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