This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section A

-Paragraph 7

-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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+ Details

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Liabilities:
Derivative liabilities	$ 1,818,000	$ 9,757,000
Assets And Liabilities Measured at Fair Value on Recurring Basis [Member] \| Fair Value Measurement [Member]
Assets:
Available-for-sale securities	649,000
Other current assets	74,000
Liabilities:
Derivative liabilities	1,818,000
Assets And Liabilities Measured at Fair Value on Recurring Basis [Member] \| Carrying Value [Member]
Assets:
Available-for-sale securities	649,000
Other current assets	74,000
Liabilities:
Derivative liabilities	1,818,000
Assets And Liabilities Measured at Fair Value on Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Assets:
Available-for-sale securities
Other current assets
Liabilities:
Derivative liabilities
Assets And Liabilities Measured at Fair Value on Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets:
Available-for-sale securities
Other current assets	74,000
Liabilities:
Derivative liabilities	1,818,000
Assets And Liabilities Measured at Fair Value on Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]
Assets:
Available-for-sale securities	649,000
Other current assets
Liabilities:
Derivative liabilities