Investments in Real Estate-Related Assets - Result of Operation for Investments in Real Estated Related Assets (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Real Estate Properties [Line Items]
Revenues	$ 3,859,818	$ 2,995,216	$ 11,846,312	$ 7,858,736
Operating expenses	(2,407,345)	(2,164,706)	(7,599,202)	(6,177,096)
Other expenses, net	(986,978)	(623,990)	(2,893,330)	(1,227,381)
Net income (loss)	465,495	206,520	1,353,780	454,259
Net income (loss) attributable to the Company	457,869	202,881	1,362,901	450,620
Delaware Statutory Trust [Member]
Real Estate Properties [Line Items]
Revenues	580,938	580,938	1,742,812	1,742,813
Operating expenses	(317,838)	(351,265)	(954,604)	(842,560)
Other expenses, net	(264,041)	(264,040)	(786,383)	(783,511)
Net income (loss)	(941)	(34,367)	1,825	116,742
Net income (loss) attributable to the Company				137,147
CO Property [Member]
Real Estate Properties [Line Items]
Revenues	840,711	840,711	2,522,133	2,522,133
Operating expenses	(364,011)	(363,351)	(1,091,538)	(1,090,742)
Other expenses, net	(346,160)	(344,441)	(1,030,548)	(1,033,377)
Net income (loss)	130,540	132,919	400,047	398,014
Net income (loss) attributable to the Company				(11,177)
Pennsylvania SPE [Member]
Real Estate Properties [Line Items]
Revenues	237,123	233,805	706,214	691,249
Operating expenses	(120)	(225)	(345)	(492)
Other expenses, net	88	1,072	1,339	3,340
Net income (loss)	237,091	234,652	707,208	694,097
Net income (loss) attributable to the Company				253,441
Illinois SPE [Member]
Real Estate Properties [Line Items]
Revenues	252,992	249,451	753,475	737,507
Operating expenses	(120)	(210)	(345)	(482)
Other expenses, net	94	1,157	1,424	3,604
Net income (loss)	$ 252,966	250,398	$ 754,554	740,629
Net income (loss) attributable to the Company		$ 177,156		$ 498,967