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Summary of Significant Accounting Policies - Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                    
Gross revenue $ 10,827 $ 13,815 $ 10,520 $ 10,268 $ 8,793 $ 13,103 $ 9,978 $ 9,706 $ 45,430 $ 41,580
Gross profit                 2,546 2,917
Net (loss) income (2,378) $ (1,201) $ (535) $ (664) (3,257) $ (756) $ (1,461) $ (1,288) (4,778) (6,762)
Total assets 51,158       59,821       51,158 59,821
Depreciation, amortization, and stock based compensation                 586 268
Interest expense                 41 881
Homebuilding [Member]                    
Segment Reporting Information [Line Items]                    
Gross revenue                 43,399 40,696
Gross profit                 2,814 2,460
Net (loss) income                 (4,348) (7,219)
Total assets 47,474       59,688       47,474 59,688
Depreciation, amortization, and stock based compensation                 409 258
Interest expense                   881
Real Estate Services [Member]                    
Segment Reporting Information [Line Items]                    
Gross revenue                 2,031 884
Gross profit                 (268) 457
Net (loss) income                 (430) 457
Total assets $ 3,684       $ 133       3,684 133
Depreciation, amortization, and stock based compensation                 177 $ 10
Interest expense                 $ 41