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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017 USD ($) Unit Segment Investment shares	Dec. 31, 2016 USD ($) Investment shares
Summary Of Significant Accounting Policies [Line Items]
Number of investments accounted for using the equity Method | Investment		1	1
Restricted cash		$ 1,141,000	$ 1,238,000
Inventory, real estate, held-for-sale		$ 0	0
Period for which warranty claims expected to arise		1 year
Period for which warranty claims expected to arise under statutorily period		2 years
Advertising costs		$ 568,000	586,000
Stock-based compensation cost		405,000	86,000
Amount capitalized to real estate owned		$ 59,000	$ 17,000
Corporate federal income tax rate		35.00%	35.00%
Number of operating segments | Segment		3
Multi-Family Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Projects units minimum | Unit		75
Projects units maximum | Unit		200
Scenario, Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Corporate federal income tax rate	21.00%
Warrants [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares considered anti-dilutive | shares		763	851
Stock Options [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares considered anti-dilutive | shares		666	404
Restricted Stock Awards [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares considered anti-dilutive | shares		0	22
Maximum [Member] | Equity Method Investee [Member]
Summary Of Significant Accounting Policies [Line Items]
Investments owned partnerships and affiliate in percent		50.00%
Sales and Marketing [Member]
Summary Of Significant Accounting Policies [Line Items]
Advertising costs		$ 560,000	$ 542,000
General and Administrative [Member]
Summary Of Significant Accounting Policies [Line Items]
Advertising costs		8,000	44,000
General and Administrative Expenses and Cost of Sales [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation cost		$ 346,000	$ 69,000

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