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Related-Party Transactions (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 14, 2020 | Feb. 20, 2020 $ / shares shares | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) quarter officer | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of executive officers | officer |  |  |  |  |  | 2 |  |
Amount due to Adviser and Administrator | [1] |  |  | $ 3,089,000 |  | $ 3,089,000 |  | $ 2,960,000
Annual base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) |  | 0.425% |  |  |  | 1.50% |  |
Quarterly base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) |  | 0.10625% |  |  |  | 0.375% |  |
Base management fee | [2] |  |  | 1,452,000 | $ 1,389,000 | $ 2,896,000 | $ 2,801,000 |
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) |  |  |  |  |  | 2.00% |  |
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) |  |  |  |  |  | 8.00% |  |
Amount to be paid to Adviser in percentage of pre-incentive fee condition one (as percent) |  |  |  |  |  | 15.00% |  |
Number of quarters used for the cap of average quarterly incentive fees | quarter |  |  |  |  |  | 4 |  |
Incentive fee | [2] |  |  | 1,039,000 | 1,119,000 | $ 2,274,000 | 2,173,000 |
Incentive fee credit |  |  |  | 16,000 | 0 | 16,000 | 0 |
Net incentive fee |  |  |  | 1,000,000.0 |  | $ 2,300,000 |  |
Portion of incentive fee waived |  |  |  |  | 0 |  | 0 |
Capital gains-based incentive fee (as percent) |  |  |  |  |  | 15.00% |  |
Capital gain fee |  |  |  | 0 | 0 | $ 0 | 0 |
Notice period for termination of agreement without cause |  |  |  |  |  | 120 days |  |
Period prior to termination |  |  |  |  |  | 24 months |  |
Notice period for termination of agreement with cause |  |  |  |  |  | 30 days |  |
Administration fee | [2] |  |  | 338,000 | 395,000 | $ 634,000 | 833,000 |
Fees paid |  |  |  | $ 0 | $ 0 | $ 14,000 | $ 89,637 |
Financing fee on total secured mortgages percentage (as percent) |  |  |  |  |  | 0.25% | 0.25% |
Selling commissions (as percent) |  |  | 6.00% |  |  |  |  |
Dealer management fee (as percent) |  |  | 3.00% |  |  |  |  |
Dealer management fee, payments for commissions |  |  |  |  |  | $ 100,000 |  |
Percentage of independent directors required to terminate the Amended Advisory Agreement (as a percent) |  |  |  |  |  | 66.67% |  |
Termination fee payable (as percent) |  |  |  |  |  | 200.00% |  |
Minimum |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of the amount of the mortgage (as percent) |  |  |  |  |  | 0.15% |  |
Maximum |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of the amount of the mortgage (as percent) |  |  |  |  |  | 1.00% |  |
Series F Cumulative Redeemable Preferred Stock | Preferred Stock | Dealer Management Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Redeemable preferred stock, shares authorized (in shares) | shares |  |  | 20,000,000 |  |  |  |  |
Redeemable preferred stock, dividend rate percentage (as percent) |  |  | 6.00% |  |  |  |  |
Redeemable preferred stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |  |  |
Redeemable preferred stock, dividend reinvestment plan, shares authorized (in shares) | shares |  |  | 6,000,000 |  |  |  |  |
[1] | Refer to Note 2 “Related-Party Transactions”
[2] | Refer to Note 2 “Related-Party Transactions”

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