Valuation Techniques and Unobservable Inputs Applied to Level Three Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Exercise multiple	2.80	2.80
Volatility	55.00%	51.00%
Significant Unobservable Inputs (Level 3) \| Real Estate Owned, Net \| Discontinued Operations
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Estimated Fair Value, Assets	$ 75	$ 830
Valuation Technique	Market approach	Market approach
Marketability discounts	20.00%	20.00%
Estimated selling costs	8.00%	8.00%
Marketability discounts, weighted average	20.00%	20.00%
Estimated selling costs, weighted average	8.00%	8.00%
Significant Unobservable Inputs (Level 3) \| Commercial and Commercial Real Estate \| Discontinued Operations
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Estimated Fair Value, Assets		51
Valuation Technique		Market approach
Marketability discounts, weighted average		85.00%
Control Discount		25.00%
Control Discount rate, weighted average		25.00%
Significant Unobservable Inputs (Level 3) \| Commercial and Commercial Real Estate \| Discontinued Operations \| Minimum
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Marketability discounts		60.00%
Significant Unobservable Inputs (Level 3) \| Commercial and Commercial Real Estate \| Discontinued Operations \| Maximum
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Marketability discounts		90.00%
Significant Unobservable Inputs (Level 3) \| Common stock warrant liability
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Estimated Fair Value, Liabilities	$ 9,300	$ 2,350
Valuation Technique	Lattice option pricing model	Lattice option pricing model
Exercise multiple	2.8	2.8
Volatility	55.00%	51.00%
Exercise multiple, weighted average	2.8	2.8
Volatility	55.00%	51.00%
Expected term, weighted average	4 years 1 month 6 days	7 years 1 month 6 days
Significant Unobservable Inputs (Level 3) \| Common stock warrant liability \| Minimum
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Expected term	4 years 1 month 6 days	7 years 1 month 6 days
Significant Unobservable Inputs (Level 3) \| Common stock warrant liability \| Maximum
Fair Value Inputs Liabilities Quantitative Information [Line Items]
Expected term	4 years 2 months 12 days	7 years 2 months 12 days

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Fair value inputs control discount rate.

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Estimated selling costs to be used to determine the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair value inputs, exercise multiple.

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Marketability discount to be used to determine the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair Value Inputs Weighted Average Control Discount

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Weighted average estimated selling costs to be used to determine the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair Value Inputs Weighted Average Exercise Multiple

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Weighted average marketability discount to be used to determine the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 820

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Weighted average expected volatility of stock price.

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Description of the inputs and valuation technique(s) used to measure fair value.

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Fair value of financial and nonfinancial obligations.

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