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Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - Dividend Reinvestment and Stock Purchase Plan (DRIP) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stockholders' Equity |  |  |  |
Issuance of common stock (in shares) | 2,004 | 4,086 | 9,038 | 9,604
Dividend reinvestments/stock purchases under the DRSPP | $ 146 | $ 202 | $ 613 | $ 566

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