Fair Value Measurements - Additional Information (Detail)	6 Months Ended
Jun. 30, 2012
Warrant
Assumptions used to Determine Fair Value Options [Line Items]
Expected dividend rate	0.00%
Warrant \| Minimum
Assumptions used to Determine Fair Value Options [Line Items]
Risk free interest rate	1.01%
Expected volatility rate	128.00%
Expected life	2 years 303 days
Warrant \| Maximum
Assumptions used to Determine Fair Value Options [Line Items]
Risk free interest rate	1.15%
Expected volatility rate	141.00%
Expected life	3 years 274 days
Options
Assumptions used to Determine Fair Value Options [Line Items]
Expected dividend rate	0.00%
Options \| Minimum
Assumptions used to Determine Fair Value Options [Line Items]
Risk free interest rate	1.26%
Expected volatility rate	123.00%
Expected life	5 years 146 days
Options \| Maximum
Assumptions used to Determine Fair Value Options [Line Items]
Risk free interest rate	1.32%
Expected volatility rate	126.00%
Expected life	5 years 329 days

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's 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 (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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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.

+ References

+ 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

+ Details

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- Definition

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

+ References

+ Details

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