Securities Purchase Agreement (Tables)

9 Months Ended

Sep. 30, 2012

Securities Purchase Agreement [Abstract]

Fair values of derivative liabilities

	Fair Value Measurement at
	September 30, 2012		December 31, 2011
Embedded Derivatives of Series C-1 2 Preferred (including dividends paid in Series C-1 2 Preferred)	$	3,707	$	3,628
Embedded Derivatives of accrued dividends payable in Series C-1 2 Preferred		193		52
Series D-1 2 Warrants		571		2,539
Series C-2 2 Warrants for:
Series C-2 2 Preferred		2,782		3,785
Series D-2 2 Warrants		5,464		5,266
	$	12,717	$	15,270

Embedded Derivatives

	September 30, 2012			December 31, 2011
Closing price per share of common stock	$	0.044		$	0.27
Conversion price per share	$	0.005		$	0.60
Volatility		98.2	%		88.0	%
Risk-free interest rate		0.58	%		0.83	%
Credit spread		19.8	%		20.9	%
Remaining expected lives of underlying securities (years)		4.8			5.0

Series D1 warrants using binomial option pricing

	September 30, 2012			December 31, 2011
Closing price per share of common stock	$	0.044		$	0.27
Conversion price per share	$	0.005		$	0.60
Volatility		74.8	%		67.5	%
Risk-free interest rate		0.23	%		0.28	%
Remaining expected lives of underlying securities (years)		2.5			2.2
Probability of Strategic Transaction		41	%		70	%

Series C2 warrants using binomial option pricing

	September 30, 2012			December 31, 2011
Closing price per share of common stock	$	0.044		$	0.27
Conversion price per share	$	0.005		$	0.60
Volatility		98.2	%		88.0	%
Risk-free interest rate		0.58	%		0.83	%
Credit spread		19.8	%		20.9	%
Remaining expected lives of underlying securities (years)		4.8			5.0
Time to exercise (months)		21			24