Mortgage Payable and Other Secured Financing - Contractual Maturities of Mortgages Payable and Other Secured Financing (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Deferred financing costs	$ (3,865,703)
Total mortgages payable and other secured financings, net	35,453,563	$ 35,540,174
Mortgages Payable and Other Secured Financing [Member]
Mortgage Loans on Real Estate [Line Items]
Remainder of 2018	632,527
2019	3,971,173
2020	24,191,921
2021	6,858,994
Total	35,654,615
Deferred financing costs	(201,052)
Total mortgages payable and other secured financings, net	$ 35,453,563