Investment in DST (Detail) - Summarized Financial Information - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Assets
Investments in real estate and fixed assets	$ 72,000		$ 72,000		$ 21,000
Cash	6,894,000	$ 9,723,000	6,894,000	$ 9,723,000	11,644,000	$ 9,435,000
Cash - restricted	3,428,000		3,428,000		3,937,000
Due from related parties	1,000		1,000
Prepaid expenses	1,746,000		1,746,000		1,679,000
Total Assets	295,396,000		295,396,000		318,344,000
Liabilities
Notes payable, net of unamortized loan issuance costs of approximately $47,000 and $46,000 as of September 30, 2020 and December 31, 2019, respectively	158,191,000		158,191,000		159,120,000
Accounts payable and accrued liabilities	10,551,000		10,551,000		10,883,000
Due to related party					54,000
Total Liabilities	188,111,000		188,111,000		188,099,000
Equity
Member's Equity	2,046,000		2,046,000		2,619,000
Accumulated earnings	(86,520,000)		(86,520,000)		(66,511,000)
Total Equity	105,239,000		105,239,000		127,626,000
Total liabilities and equity	295,396,000		295,396,000		318,344,000
Income Statement
Revenue	3,510,000	6,081,000	12,523,000	16,882,000
Equity Method Investments [Member]
Assets
Investments in real estate and fixed assets	11,512,000		11,512,000		11,512,000
Cash	1,000		1,000		28,000
Cash - restricted	31,000		31,000		24,000
Due from related parties	158,000		158,000
Prepaid expenses	12,000		12,000		10,000
Total Assets	11,714,000		11,714,000		11,574,000
Liabilities
Notes payable, net of unamortized loan issuance costs of approximately $47,000 and $46,000 as of September 30, 2020 and December 31, 2019, respectively	5,953,000		5,953,000		5,954,000
Accounts payable and accrued liabilities	303,000		303,000		93,000
Due to related party					57,000
Total Liabilities	6,256,000		6,256,000		6,104,000
Equity
Member's Equity	6,129,000		6,129,000		6,129,000
Offering costs	(574,000)		(574,000)		(574,000)
Accumulated earnings	1,220,000		1,220,000		952,000
Distributions to members	(1,317,000)		(1,317,000)		(1,037,000)
Total Equity	5,458,000		5,458,000		5,470,000
Total liabilities and equity	11,714,000		11,714,000		$ 11,574,000
Income Statement
Revenue	182,000	183,000	547,000	556,000
Expenses	(99,000)	(91,000)	(279,000)	(269,000)
Net income	$ 83,000	$ 92,000	$ 268,000	$ 287,000