Properties and Equipment - Properties and Equipment (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Properties and equipment gross	$ 7,088,000	$ 7,088,000
Less accumulated depreciation	308,000	239,000
Properties and equipment net	6,780,000	6,849,000
Steeple Street Property [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment gross	3,011,000	3,011,000
Less accumulated depreciation	151,000	86,000
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Properties and equipment gross	67,000	67,000
Less accumulated depreciation	67,000	66,000
Properties on Lease or Held for Lease, Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Properties on lease or held for lease, land and land improvements	4,010,000	4,010,000
Properties on Lease or Held for Lease [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation	$ 90,000	$ 87,000