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Summary of Significant Accounting Policies - Additional Information (Detail)		12 Months Ended
	Jan. 01, 2019 USD ($)	Dec. 31, 2019 USD ($) Sector	Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Revenue, practical expedient, incremental cost of obtaining contract		true
Stock based compensation cost		$ 479,000	$ 257,000
Stock based compensation cost capitalized to Long-term assets of discontinued operations		5,000	23,000
Lease ROU assets		114,000	0
Lease liabilities		114,000
ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Lease ROU assets	$ 170,000
Lease liabilities	170,000
Cumulative effect on beginning retained earnings	$ 0
General and Administrative and Direct Costs - Real Estate Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock based compensation expenses		$ 474,000	$ 234,000
Unconsolidated Real Estate Venture [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of sector, real estate own and operate | Sector		2
Minimum [Member] | Unconsolidated Real Estate Venture [Member]
Summary Of Significant Accounting Policies [Line Items]
Investments in real estate ventures, planned investment period		3 years
Maximum [Member] | Unconsolidated Real Estate Venture [Member]
Summary Of Significant Accounting Policies [Line Items]
Investments in real estate ventures, planned investment period		7 years
Customer Concentration Risk [Member] | Revenues [Member] | Related Party Entities [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		81.00%

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