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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity [Abstract]

Fair value of the warrants

The fair value of the warrants at June 30, 2012, and December 31, 2011, consisted of the following (in thousands):

		June 30, 2012				December 31, 2011
2009 Warrants		$	2,772			$	3,010
2010 Warrants			5,977				4,969
Total warrant liability		$	8,749			$	7,979

Fair value assumptions of warrants

The fair value of the Company’s warrants was based on using the binomial-lattice option valuation model and using the following assumptions at June 30, 2012, and December 31, 2011:

		June 30, 2012				December 31, 2011
2009 Warrants:
Expected term (in years)			2.15				2.65
Estimated volatility			52	%			74	%
Risk-free interest rate			0.33	%			0.36	%
Expected dividend yield			0	%			0	%
2010 Warrants:
Expected term (in years)			3.36				3.86
Estimated volatility			70	%			70	%
Risk-free interest rate			0.41	%			0.60	%
Expected dividend yield			0	%			0	%

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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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