STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2012

STOCK-BASED COMPENSATION

Schedule of fair value of each stock award which has been estimated on the grant date based on the weighted-average assumptions

	Three months ended September 30,						Nine months ended September 30,
	2012			2011			2012			2011
Risk-free interest rate		1.21	%		1.47	%		1.27	%		2.01	%
Dividend yield		—			—			—			—
Expected volatility		63.14	%		59.01	%		70.44	%		58.51	%
Expected life (in years)		6.62			6.27			6.28			5.95

Schedule of stock options activity

	Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Balance at January 1, 2012		14,366,623		$	3.83
Granted		2,305,170			1.85
Exercised		(415,081	)		1.35
Forfeited		(251,949	)		2.46
Expired		(507,237	)		3.84
Balance at September 30, 2012		15,497,526		$	3.62		5.84	$	10,796,300
Vested or expected to vest at September 30, 2012		14,882,686		$	3.62		5.80	$	10,360,500
Exercisable at September 30, 2012		10,447,411		$	3.78		5.14	$	6,473,900