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Significant Accounting Policies - Variable Interest Entities (Details) | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Variable interest entity |  |  |  |  |  |  |
Gain on consolidation of Sponsored REIT |  | $ 394,000 |  |  |  |  |
Cash, cash equivalents and restricted cash |  | 127,880,000 |  |  | $ 6,632,000 | $ 40,751,000 | $ 4,150,000
VIE at Consolidation |  |  |  |  |  |  |
Real estate assets |  | 890,824,000 |  |  | 1,103,248,000 |  |
Acquired real estate leases |  | 6,694,000 |  |  | 10,186,000 |  |
Related party mortgage loan receivable |  |  |  |  | 19,763,000 |  |
FSP Monument Circle LLC |  |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | 2,167,000 |  |  |  |  |
Level 3 |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Related party mortgage loan receivable |  |  |  |  | $ 19,763,000 |  |
Level 3 | Exit Cap Rate | Maximum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 7.50 |  |
Level 3 | Exit Cap Rate | Minimum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 7.50 |  |
Level 3 | Exit Cap Rate | Weighted Average |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 7.50 |  |
Level 3 | Discount Rate | Maximum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |  |
Level 3 | Discount Rate | Minimum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |  |
Level 3 | Discount Rate | Weighted Average |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  |  | 9.50 |  |
Variable interest entities ("VIEs") |  |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |  |
Gain on consolidation of Sponsored REIT | $ 400,000 |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | 2,167,000 |  |  | $ 0 |  |
VIE at Consolidation |  |  |  |  |  |  |
Real estate assets |  | 19,354,000 | $ 19,695,000 |  | 0 |  |
Acquired real estate leases |  | 305,000 | 305,000 |  | 0 |  |
Total |  |  | $ 20,000,000 |  |  |  |
Variable interest entities ("VIEs") | FSP Monument Circle LLC |  |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ 3,000,000 |  |  |  |  |
Variable interest entities ("VIEs") | Level 3 |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Related party mortgage loan receivable |  |  |  | $ (20,000,000) |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Maximum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0750) |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Minimum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0750) |  |  |
Variable interest entities ("VIEs") | Level 3 | Exit Cap Rate | Weighted Average |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0750) |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Maximum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0950) |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Minimum |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0950) |  |  |
Variable interest entities ("VIEs") | Level 3 | Discount Rate | Weighted Average |  |  |  |  |  |  |
VIE at Consolidation |  |  |  |  |  |  |
Measurement input |  |  |  | (0.0950) |  |  |
VIE, Not Primary Beneficiary |  |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |  |
Maximum exposure to losses associated with VIE |  |  |  |  | 22,100,000 |  |
VIE, Not Primary Beneficiary | Prepaid expenses and other assets |  |  |  |  |  |  |
Variable interest entity |  |  |  |  |  |  |
Accrued interest and exit fee receivables |  |  |  |  | $ 2,300,000 |  |

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