Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-Based Compensation

Schedule of assumptions used in the valuation of fair value of each option award

	2012			2011			2010
Weighted average fair value of awards	$	2.16		$	2.07		$	2.19
Pre-vest forfeiture rate	7.36		%	6.92		%	5.01		%
Average grant price	$	3.23		$	3.35		$	3.19
Expected volatility	74.68		%	74.47		%	75.38		%
Risk-free rate	1.13		%	1.65		%	2.55		%
Expected dividend yields	None			None			None
Expected term (in years)	6.40			6.34			6.36

Summary of stock option activity

	Number of Shares Underlying Options		Weighted Average Exercise Price	Intrinsic Value
Outstanding at December 31, 2010	1,741,543		8.84	$	700,174
Granted	1,453,240		4.79	—
Exercised	(25,036	)	2.42	$	17,251
Cancelled/forfeited	(1,454,389	)	10.20	$	42,039
Outstanding at December 31, 2011	1,715,358		4.35	$	114,189
Granted	34,500		3.23	—
Exercised	(15,463	)	2.43	$	30,745
Cancelled/forfeited	(58,976	)	3.89	$	65,302
Outstanding at December 31, 2012	1,675,419		4.36	$	69,712
Exercisable at December 31, 2012	522,870		4.01	$	48,425

Summary of restricted stock activity

			Weighted-Average
			Grant Date
	Shares		Fair Value
Non-vested as of December 31, 2010	1,268,037		$	3.28
Granted	485,992		3.78
Vested	(354,051	)	3.48
Cancelled/forfeited	(192,665	)	3.70
Non-vested as of December 31, 2011	1,207,313		3.36
Granted	1,013,879		3.26
Vested	(393,127	)	3.23
Cancelled/forfeited	(43,601	)	3.23
Non-vested as of December 31, 2012	1,784,464		$	3.33