Input to Lattice Model that was Used to Value Embedded Derivative (Detail) - Fair Value, Inputs, Level 2 - 2022 Notes - Embedded Derivative Financial Instruments	12 Months Ended
Dec. 31, 2014 $ / shares
Derivative [Line Items]
Stock price	$ 4.80
Conversion Rate	11.7113
Conversion Price	$ 85.39
Maturity date	Jul. 01, 2022
Risk-free interest rate	2.00%
Estimated stock volatility	87.00%
Estimated credit spread	20.00%

The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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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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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

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Price of a single share of a number of saleable stocks of a company.

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