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Assets and Liabilities Measured at Fair Value (Tables)

3 Months Ended

Mar. 31, 2013

Assets and Liabilities Measured at Fair Value [Abstract]

Schedule of fair value of the warrants

		2012 Warrants				2009 Warrants
Expected volatility			83.33	%			83.43	%
Risk-free interest rates			0.27	%			0.16	%
Expected life (in years)			2.25				1.25

Assets and liabilities measured at fair value on a recurring basis

The table below presents the Company's assets and liabilities measured at fair value on a recurring basis as of March 31, 2013, aggregated by the level in the fair value hierarchy within which those measurements fall:

Assets and Liabilities Measured at Fair Value on a Recurring Basis at March 31, 2013

(in thousands)

		Level 1				Level 2				Level 3				Balance at March 31, 2013
Assets
Money market funds		$	1,956			$	—			$	—			$	1,956
Liabilities
Warrant liability		$	—			$	—			$	5,485			$	5,485

Fair value measurements using significant unobservable inputs

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

(in thousands)

		Warrant Liability
Beginning balance as of December 31, 2012		$	3,427
Total change in the liability included in earnings			2,272
Fair value of warrants exercised			(214	)
Ending balance as of March 31, 2013		$	5,485

X

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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