Schedule of Estimated Fair Value Assumption of Term Loan and 2017 Notes (Detail) - Convertible 2017 Notes	9 Months Ended	12 Months Ended
Sep. 30, 2015 $ / shares	Dec. 31, 2014 $ / shares
Debt Instrument [Line Items]
Conversion Rate	0.0576
Maturity date	Mar. 15, 2017
Term Loans
Debt Instrument [Line Items]
Stock price	$ 1.72	$ 4.80
Conversion Rate	57.6	57.6
Conversion Price	$ 17.38	$ 17.38
Maturity date	Mar. 15, 2017	Mar. 15, 2017
Risk-free interest rate	0.47%	0.80%
Estimated stock volatility	130.00%	87.00%
Estimated credit spread	27.00%	15.00%

Conversion price.

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

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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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