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Fair Value Measurements - Summary of Quantitative Information about Fair Value Measurements, Including the Range of Assumptions for the Significant Unobservable Inputs (Detail) - 12 months ended Dec. 31, 2014 - Fair Value, Measurements, Recurring [Member] - Level 3 [Member] - Preferred Stock Warrants [Member]	Total
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time to liquidity event	6 months
Risk-free interest rate	0.12%
Volatility	60.00%
Minority discount	10.00%
Discount for lack of marketability	23.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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-Name Accounting Standards Codification



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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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Risk-free interest rate assumption used in valuing an instrument.

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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

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Interest rate used to find 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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