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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Real Estate Properties [Line Items]
Revenues	$ 10,782,166	$ 3,859,818	$ 23,827,770	$ 11,846,312
Operating expenses	(8,688,496)	(2,407,345)	(18,333,521)	(7,599,202)
Other expenses, net	(2,687,627)	(986,978)	(5,740,654)	(2,893,330)
Net income (loss)	(593,957)	465,495	(246,405)	1,353,780
Net income (loss) attributable to the Company	(97,697)	$ 457,869	745,596	$ 1,362,901
Station DST [Member]
Real Estate Properties [Line Items]
Revenues	1,663,653		5,163,181
Operating expenses	(440,935)		(1,377,336)
Other expenses, net	(1,157,106)		(3,470,166)
Net income (loss)	65,612		315,679
Net income (loss) attributable to the Company	$ 9,842		$ (76,208)