Schedule of Estimated Fair Value Assumption of 2017 Notes (Detail) - Convertible 2017 Notes - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Stock price	$ 0.59	$ 0.62
Conversion Rate	57.55	57.55
Conversion Price	$ 17.38	$ 17.38
Maturity date	Mar. 15, 2017	Mar. 15, 2017
Risk-free interest rate	0.40%	0.74%
Estimated stock volatility	150.00%	140.00%
Estimated credit spread	30.00%	30.00%

Conversion price.

No definition available.

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- Definition

Debt instrument convertible conversion ratio per one thousand dollars principal amount.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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