Transactions with Related Parties - Summary of Amounts Reimbursable to AFCA 2, the General Partner of AFCA 2, or an Affiliate (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Amounts reimbursable to related party	$ 301,000	$ 330,000
General Partner [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	5,066,741	4,376,708
General Partner [Member] | Reimbursable Salaries and Benefits [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	4,702,754	3,993,067
General Partner [Member] | Other Expenses [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	19,622	13,121
General Partner [Member] | Office Expenses [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	17,630
General Partner [Member] | Insurance [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	243,773	215,867
General Partner [Member] | Professional Fees and Expenses [Member]
Related Party Transaction [Line Items]
Amounts reimbursable to related party	$ 82,962	$ 154,653