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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Other | $ 857 | $ 909
Unsecured financing, net of unamortized deferred financing charges of $0 and $0, respectively | 595 | 595
Notes payable- due to affiliates, unsecured, net of $0.8 million and $0.8 million discount and unamortized deferred financing charges, respectively | 4,935 | 4,903
Total | 15,563 | 18,930
Construction Loans [Member] | Construction Revolvers [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 1,883 | 2,220
Development and Acquisition Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 7,293 | 10,290
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | 0 | 13
Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, gross | $ 10,033 | $ 13,432

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