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Equity - Narrative (Details) |  |  |  |  |  |  |  |  |  | 12 Months Ended | 61 Months Ended |  |  |
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Sep. 09, 2021 shares | Jul. 02, 2021 shares | Jun. 18, 2021 shares | Jun. 07, 2021 shares | May 17, 2021 shares | Mar. 12, 2021 shares | Jan. 22, 2021 shares | Dec. 07, 2020 shares | Nov. 25, 2020 $ / shares | Dec. 31, 2022 $ / shares shares | Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 shares | Dec. 31, 2022 USD ($) $ / shares shares | Apr. 11, 2022 USD ($) | Apr. 06, 2022 USD ($) $ / shares | Dec. 11, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |
Authorized amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
Stock repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Additional acquisition of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  | 43,007 | 1,420 | 3,056 |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  | 50,000,000 |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |
Preferred Stock, Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock percentage |  |  |  |  |  |  |  |  |  | 8.45% |  |  |  |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  | 0.01 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,174,427 | 1,174,427 |  | 1,174,427 |  |  |
Redemption price of preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25 |  |  | $ 25 |  |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | 25.00 |  |  | $ 25.00 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.1124 |  |  |  |  |  |
Increased dividend rate percentage |  |  |  |  |  |  |  |  |  | 9.45% |  |  |  |  |  |
Preferred Stock, Series F |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock percentage |  |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  | 0.01 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,251,044 | 1,251,044 |  | 1,251,044 |  |  |
Redemption price of preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | 25.00 |  |  | $ 25.00 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.8436 |  |  |  |  |  |
Conversion ratio to common stock |  |  |  |  |  |  |  |  |  | 0.09690 |  |  | 0.09690 |  |  |
Preferred Stock, Series G |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock percentage |  |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,531,996 | 1,531,996 |  | 1,531,996 |  |  |
Redemption price of preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | 25.00 |  |  | $ 25.00 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.8436 |  |  |  |  |  |
Conversion ratio to common stock |  |  |  |  |  |  |  |  |  | 0.08333 |  |  | 0.08333 |  |  |
Preferred Stock, Series H |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock percentage |  |  |  |  |  |  |  |  | 7.50% | 7.50% |  |  |  |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,308,415 | 1,308,415 |  | 1,308,415 |  |  |
Redemption price of preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | 25.00 |  |  | $ 25.00 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.8750 |  |  |  |  |  |
Conversion ratio to common stock |  |  |  |  |  |  |  |  |  | 0.08251 |  |  | 0.08251 |  |  |
Preferred Stock, Series I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock percentage |  |  |  |  |  |  |  |  | 7.50% | 7.50% |  |  |  |  |  |
Preferred stock, par value (in dollars per shares) |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,252,923 | 1,252,923 |  | 1,252,923 |  |  |
Redemption price of preferred stock (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | 25.00 |  |  | $ 25.00 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.8750 |  |  |  |  |  |
Conversion ratio to common stock |  |  |  |  |  |  |  |  |  | 0.08065 |  |  | 0.08065 |  |  |
At-The-Market Equity Distribution | Virtu Americas LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Private Placement | M3A LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | Keystone Capital Partners, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Private Placement | YA II PN, Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  | 3,800,000 |  |  | 1,400,000 |  |  |  |  |  |  |  |  |
Private Placement | Seven Knots, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | B. Riley Principal Capital, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement | First Lincoln Park Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |
Private Placement | Second Lincoln Park Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  | 16,000 |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |
Common Stock | At-The-Market Equity Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 437,000 |  |  |
Sale of stock, consideration received on transaction | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,500,000 |  |  |
Commission percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |

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