Securities Purchase Agreement (Tables)

12 Months Ended

Dec. 31, 2012

Securities Purchase Agreement [Abstract]

Fair values of derivative liabilities

	Fair Value Measurements at
	December 31, 2012		December 31, 2011
Embedded Derivatives of Series C-1 2 Stock (including dividends paid in Series C-1 2Stock)	$	—	$	3,628
Embedded Derivatives of accrued dividends payable in Series C-1 2 Stock		—		52
Series D-1 2 Warrants		—		2,539
Series C-2 2 Warrants for:
Series C-2 2 Stock		—		3,785
Series D-2 2 Warrants		—		5,266
	$	—	$	15,270

Embedded Derivatives

	December 31, 2012			December 31, 2011
Closing price per share of Common Stock	$	—		$	0.27
Conversion price per share	$	—		$	0.60
Volatility		—	%		88.0	%
Risk-free interest rate		—	%		0.83	%
Credit spread		—	%		20.9	%
Remaining expected lives of underlying securities (years)		—			5.0

Series D1 warrants using binomial option pricing

	December 31, 2012			December 31, 2011
Closing price per share of Common Stock	$	—		$	0.27
Conversion price per share	$	—		$	0.60
Volatility		—	%		67.5	%
Risk-free interest rate		—	%		0.28	%
Remaining expected lives of underlying securities (years)		—			2.2
Probability of Strategic Transaction		—	%		70	%

Series C2 warrants using binomial option pricing

	December 31, 2012			December 31, 2011
Closing price per share of Common Stock	$	—		$	0.27
Conversion price per share	$	—		$	0.60
Volatility		—	%		88.0	%
Risk-free interest rate		—	%		0.83	%
Credit spread		—	%		20.9	%
Remaining expected lives of underlying securities (years)		—			5.0
Time to Exercise (months)		—			24