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Stock Purchase Warrants (Tables)

9 Months Ended

Sep. 30, 2012

Stock Purchase Warrants

Schedule of assumptions used in calculating estimated fair value of warrants

October 2007 Warrants		December 31, 2011			September 30, 2012
Closing stock price		$	1.82		$	1.63
Expected dividend rate		0		%	0		%
Expected stock price volatility		93.6		%	56.2		%
Risk-free interest rate		0.1		%	0.2		%
Expected life (years)		1.25			0.50

January 2010 Class A Warrants		December 31, 2011			September 30, 2012
Closing stock price		$	1.82		$	1.63
Expected dividend rate		0		%	0		%
Expected stock price volatility		86.1		%	73.6		%
Risk-free interest rate		0.5		%	0.3		%
Expected life (years)		3.50			2.75

December 2010 Warrants		December 31, 2011			September 30, 2012
Closing stock price		$	1.82		$	1.63
Expected dividend rate		0		%	0		%
Expected stock price volatility		83.6		%	70.7		%
Risk-free interest rate		0.6		%	0.4		%
Expected life (years)		3.96			3.21

Summary of change in estimated fair value of warrant liabilities

Warrant Liabilities
Balance at December 31, 2011		$	16,625
Warrants exchanged for common stock		(10,382		)
Decrease in fair value		(3,289		)
Balance at September 30, 2012		$	2,954

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Tabular disclosure of change in the estimated fair value of the warrant liabilities.

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Tabular disclosure of the significant assumptions used during the period to estimate the fair value of warrant liabilities, including, but not limited to: (a) expected term of instruments, (b) expected volatility of the entity's shares, (c) closing stock price, (d) risk-free rate, and (e) dividend rate.

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