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Summary of Significant Accounting Policies - Schedule of Recurring Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Level 1 [Member] | Unsecured Notes [Member]    
Derivatives Fair Value [Line Items]    
Debt instruments measured at fair value   $ (25,390,000)
Level 2 [Member] | Interest Rate Caps [Member]    
Derivatives Fair Value [Line Items]    
Interest rate cap $ 4,504 94,697
Level 2 [Member] | Interest Rate Swap [Member]    
Derivatives Fair Value [Line Items]    
Interest rate cap (2,064,709) (984,677)
Level 2 [Member] | Mortgage Loans [Member]    
Derivatives Fair Value [Line Items]    
Debt instruments measured at fair value $ (363,229,617) $ (357,279,949)