Properties and Equipment - Properties and Equipment (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Properties and equipment gross	$ 7,067,000	$ 7,116,000
Less accumulated depreciation	144,000	165,000
Properties and equipment net	6,923,000	6,951,000
Steeple Street Property Under Contract, Net [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment gross	2,990,000	3,011,000
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment gross	67,000	95,000
Less accumulated depreciation	63,000	86,000
Properties on Lease or Held for Lease [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	81,000	79,000
Properties on Lease or Held for Lease [Member] | Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment gross	$ 4,010,000	$ 4,010,000