Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Stock-Based Compensation

Schedule of weighted average assumptions used to estimate fair value of each service-based stock option grant

	Quarter Ended March 31,
	2012		2013
Service-Based Stock Options
Expected dividend rate	0	%	0	%
Expected stock price volatility	73.9	%	74.0	%
Risk-free interest rate	1.4	%	1.4	%
Expected life (years)	6.3		6.3

Summary of activity for service-based stock options

	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Service-Based Stock Options
Outstanding at December 31, 2012	9,987,468	$	2.38	7.5	$	—
Granted	1,100,000	$	1.29
Exercised	—	$	—		$	—
Forfeited or expired	—	$	—
Outstanding at March 31, 2013	11,087,468	$	2.27	7.4	$	—
Exercisable at March 31, 2013	4,956,364	$	2.59	5.5	$	—