Secured Line of Credit - Additional Information (Details) - USD ($)	1 Months Ended		9 Months Ended
	Aug. 31, 2021	Jun. 30, 2021	Sep. 30, 2021
BankUnited, N.A. and Bankers Trust Company [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 40,000,000
Secured Line Of Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity			$ 90,000,000
Minimum liquidity		5,000,000
Minimum consolidated tangible net worth		$ 100,000,000.0
Percentage of minimum consolidated net worth decline from immediately preceding quarter		20.00%
Percentage of minimum consolidated net worth decline from date at the end of two consecutive calendar quarters ending immediately thereafter		35.00%
Debt Instrument, covenant compliance			The Partnership is subject to various affirmative and negative covenants under the Secured Credit Agreement that, among others, require the Partnership to maintain a minimum liquidity of not less than $5 million, maintain a minimum consolidated tangible net worth of $100.0 million, and to notify the Administrative Agent if the Partnership’s consolidated net worth declines by (a) more than 20% from the immediately preceding quarter, or (b) more than 35% from the date at the end of two consecutive calendar quarters ending immediately thereafter. The Partnership was in compliance with all covenants as of September 30, 2021.
Secured Line Of Credit Facility [Member] | BankUnited, N.A. and Bankers Trust Company [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		$ 40
Aggregate available commitment cannot exceed borrowing base calculation equal to multiplied by the aggregate value of pool of eligible encumbered assets percentage		40.00%
Percentage of partnership’s capital contributions to equity investments		100.00%
Secured Line Of Credit Facility [Member] | BankUnited, N.A [Member]
Line Of Credit Facility [Line Items]
Minimum amount required to maintain security interest in bank account		$ 5,000,000
Secured Line Of Credit Facility [Member] | Bankers Trust Non-operating [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 50,000,000
Debt instrument, payment terms			Advances on the Acquisition LOC are due on the 270th day following the advance date but may be extended for up to three additional 90-day periods
Required percentage of principal payment for first extension	5.00%
Required percentage of principal payment for second extension	10.00%
Required percentage of principal payment for third extension	20.00%