Investments in Real Estate-Related Assets - Result of Operation for Investments in Real Estated Related Assets (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Real Estate Properties [Line Items]
Revenues	$ 4,011,000	$ 2,564,387	$ 7,986,494	$ 4,863,520
Operating expenses	(2,651,705)	(1,979,323)	(5,191,857)	(4,012,390)
Other expenses, net	(973,086)	(387,982)	(1,906,352)	(603,391)
Net income (loss)	386,209	197,082	888,285	247,739
Net income (loss) attributable to the Company	404,187	197,082	905,032	247,739
Delaware Statutory Trust [Member]
Real Estate Properties [Line Items]
Revenues	580,937	580,938	1,161,874	1,161,875
Operating expenses	(318,409)	(280,885)	(636,766)	(491,295)
Other expenses, net	(261,171)	(261,170)	(522,342)	(519,471)
Net income (loss)	1,357	38,883	2,766	151,109
Net income (loss) attributable to the Company		40,971		137,147
CO Property [Member]
Real Estate Properties [Line Items]
Revenues	840,711	840,711	1,681,422	1,681,422
Operating expenses	(363,807)	(364,034)	(727,527)	(727,391)
Other expenses, net	(342,502)	(337,967)	(684,388)	(688,936)
Net income (loss)	134,402	138,710	269,507	265,095
Net income (loss) attributable to the Company		(11,177)		(11,177)
Pennsylvania SPE [Member]
Real Estate Properties [Line Items]
Revenues	234,545	231,264	469,091	457,444
Operating expenses	(105)	(267)	(225)	(267)
Other expenses, net	222	2,268	1,251	2,268
Net income (loss)	234,662	233,265	470,117	459,445
Net income (loss) attributable to the Company		117,003		253,441
Illinois SPE [Member]
Real Estate Properties [Line Items]
Revenues	250,241	246,739	500,483	488,056
Operating expenses	(105)	(272)	(225)	(272)
Other expenses, net	237	2,447	1,330	2,447
Net income (loss)	$ 250,373	248,914	$ 501,588	490,231
Net income (loss) attributable to the Company		$ 176,107		$ 321,811