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Management Agreement with Tremont (Details) $ in Thousands	3 Months Ended
Management Agreement with Tremont (Details) $ in Thousands	Mar. 31, 2023 USD ($) employee	Mar. 31, 2022 USD ($)
Related Party Transactions [Abstract]
Number of employees \| employee	0
Quarterly base management fee (as a percent)	0.375%
Annualized base management fee (as a percent)	1.50%
Base management fees	$ 1,072	$ 1,063
Incentive fee	0	0
Reimbursement of shared services expenses	$ 643	$ 634