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Debt - Summary of Notes Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Secured-other	$ 1,069
Net secured notes	23,215	$ 26,927
Unsecured financing, net of unamortized deferred financing charges of $55 and $121	1,285	911
Notes payable, unsecured, net of $2.0 and $2.1 million discount and unamortized deferred financing charges, respectively	14,893	15,866
Total	39,393	43,704
Construction Loans [Member] | Construction Revolvers [Member]
Debt Instrument [Line Items]
Debt instrument, gross	7,337	6,429
Net secured notes	7,300	6,400
Development and Acquisition Notes [Member]
Debt Instrument [Line Items]
Debt instrument, gross	11,584	16,278
Net secured notes	11,600	16,300
Mezzanine Notes [Member]
Debt Instrument [Line Items]
Debt instrument, gross	1,244	1,424
Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, gross	2,131	2,929
Net secured notes	2,100	2,900
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, gross	23,365	27,060
Deferred financing charges, net of amortization	$ (150)	$ (133)

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