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Subsequent Events - Equity Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 10, 2021 | Jan. 31, 2021 | Aug. 31, 2016 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Apr. 03, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net Proceeds |  |  |  | $ 109,720 | $ 39,563 |  |
Common stock, shares authorized (in shares) |  |  |  | 63,944,073 |  | 65,544,073 |
Series C Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 25,999,862 |  | 25,999,862 |
Series A Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 0 |  | 2,000,000 |
Series B Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 6,456,065 |  | 6,456,065 |
Series D Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 3,600,000 |  | 0 |
Subsequent Event | Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of Shares Sold (in shares) | 849,285 |  |  |  |  |  |
Weighted-average offering price per share (in dollars per share) | $ 23.70 |  |  |  |  |  |
Gross Proceeds | $ 20,132 |  |  |  |  |  |
Net Proceeds | $ 19,931 |  |  |  |  |  |
Preferred Stock | Series C Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, shares issued, pursuant to DRIP (in shares) |  |  |  | 2,001 |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  | 20,000,000
Preferred Stock | Series A Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Weighted-average offering price per share (in dollars per share) |  |  | $ 25.00 |  |  |  |
Net Proceeds |  |  | $ 27,600 |  |  |  |
Preferred Stock | Series D Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Weighted-average offering price per share (in dollars per share) |  | $ 25.00 |  |  |  |  |
Net Proceeds |  | $ 58,300 |  |  |  |  |
Preferred Stock | Subsequent Event | Series C Preferred Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of Shares Sold (in shares) | 169,425 |  |  |  |  |  |
Weighted-average offering price per share (in dollars per share) | $ 24.89 |  |  |  |  |  |
Gross Proceeds | $ 4,217 |  |  |  |  |  |
Net Proceeds | $ 3,854 |  |  |  |  |  |
Preferred stock, shares issued, pursuant to DRIP (in shares) | 1,405 |  |  |  |  |  |

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