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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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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% |

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