Segment Disclosures - Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Gross revenue	$ 14,939	$ 13,815	$ 38,038	$ 34,603
Gross profit (loss)	(163)	484	(102)	2,433
Net (loss) income	(1,614)	(1,201)	(3,059)	(2,400)
Depreciation and amortization	54	98	191	251
Interest expense	24	16	134	16
Total assets	39,108	56,013	39,108	56,013	$ 51,158
Real Estate [Member]
Segment Reporting Information [Line Items]
Gross revenue	14,939	13,815	38,038	34,603
Homebuilding [Member]
Segment Reporting Information [Line Items]
Gross profit (loss)	(225)	594	(993)	2,571
Net (loss) income	(1,536)	(1,000)	(2,824)	(2,168)
Depreciation and amortization	18	15	80	125
Interest expense	0	0	61	0
Total assets	31,780	53,258	31,780	53,258
Homebuilding [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Gross revenue	11,497	13,076	27,767	33,375
Asset Management [Member]
Segment Reporting Information [Line Items]
Gross profit (loss)	272	0	876	0
Net (loss) income	204	0	808	0
Depreciation and amortization	0	0	0	0
Interest expense	0	0	0	0
Total assets	3,363	0	3,363	0
Asset Management [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Gross revenue	2,730	0	8,481	0
Real Estate Services [Member]
Segment Reporting Information [Line Items]
Gross profit (loss)	(210)	(110)	15	(138)
Net (loss) income	(282)	(201)	(1,043)	(232)
Depreciation and amortization	36	83	111	126
Interest expense	24	16	73	16
Total assets	3,965	2,755	3,965	2,755
Real Estate Services [Member] | Real Estate [Member]
Segment Reporting Information [Line Items]
Gross revenue	$ 712	$ 739	$ 1,790	$ 1,228