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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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