Secured Line of Credit - Additional Information (Details) - Secured Line Of Credit Facility [Member]	1 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 40,000,000	$ 40,000,000
Minimum liquidity	5,000,000.0	5,000,000.0
Minimum consolidated tangible net worth	$ 100,000,000.0	$ 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 that, among others, require the Partnership to maintain a minimum liquidity of not less than $5.0 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 June 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	$ 40,000,000
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%
BankUnited, N.A [Member]
Line Of Credit Facility [Line Items]
Minimum amount required to maintain security interest in bank account	$ 5,000,000.0	$ 5,000,000.0