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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Investment
Segment
shares
Dec. 31, 2017
USD ($)
Investment
Segment
shares
Summary Of Significant Accounting Policies [Line Items]    
Number of investments accounted for using the equity Method | Investment 1 1
Restricted cash $ 1,231,000 $ 1,141,000
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  
Contract liabilities, customer deposits received $ 1,189,000 575,000
Revenue recognized from customer deposit 500,000  
Advertising costs 130,000 568,000
Stock-based compensation cost 257,000 405,000
Amount capitalized to real estate owned $ 23,000 $ 59,000
Corporate federal income tax rate 21.00% 35.00%
Number of operating segments | Segment 3 3
Accounting Standards Update 2016-15 [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Reclassification of cash and restricted cash   $ 1,100,000
Warrants [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Shares considered anti-dilutive | shares 450 400
Stock Options [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Shares considered anti-dilutive | shares 441 489
Restricted Stock Awards [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Shares considered anti-dilutive | shares 138 243
Sales and Marketing [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Advertising costs $ 129,000 $ 560,000
General and Administrative [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Advertising costs 1,000 8,000
General and Administrative Expenses and Cost of Sales [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Stock-based compensation cost 234,000 346,000
Homebuilding [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Contract liabilities, customer deposits received $ 1,189,000 $ 575,000
Asset Management Segment [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Projects units minimum | Segment 100  
Projects units maximum | Segment 500  
Maximum [Member] | Equity Method Investee [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Investments owned partnerships and affiliate in percent 100.00%