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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Stock-based Compensation [Abstract]

Stock Option Activity

A summary of activity for the year ended December 31, 2013 is as follows:

		Options				Weighted Average Exercise Price
Balance as of January 1, 2013			6,744,986			$	5.02
Granted			2,548,950			$	3.23
Exercised			(17,500	)		$	2.14
Expired			(499,586	)		$	4.28
Cancelled/forfeited			(454,561	)		$	4.55
Balance as of December 31, 2013			8,322,289			$	4.55

Stock Options Vested and Expected to Vest

		Options				Weighted Average  Exercise Price				Weighted  Average  Remaining Contractual  Term (years)				Aggregate  Intrinsic Value
Balance as of December 31, 2013			8,322,289			$	4.55				6.10			$	148,817
Vested and expected to vest at December 31, 2013			8,277,773			$	4.56				6.09			$	147,931
Exercisable at December 31, 2013			5,718,096			$	5.05				4.88			$	111,654

Weighted-average Assumptions

The fair value of each option awarded during the year ended December 31, 2013, 2012 and 2011 was estimated on the date of grant using the Black-Scholes-Merton option valuation model based on the following weighted-average assumptions:

		Years ended December 31,
		2013				2012				2011
Expected term		6.0 years				5.20 years				5.5 years
Risk-free interest rate			1.12	%			0.83	%			1.95	%
Volatility			75.27	%			75.63	%			72.36	%
Dividends			—				—				—
Resulting weighted average grant date fair value		$	1.72			$	1.96			$	3.24

Restricted Stock Awards Activity

A summary of activity for the year ended December 31, 2013 is as follows:

		Restricted  Stock Awards				Weighted Average Grant Date Fair Value
Balance as of January 1, 2013			294,741			$	3.55
Granted			57,600			$	2.60
Exercised/Released			(236,000	)		$	3.29
Cancelled/forfeited			(10,000	)		$	3.44
Balance as of December 31, 2013			106,341			$	3.62

Restricted Stock Awards Vested and Expected to Vest

		Restricted Stock Awards				Weighted Average Grant  Date Fair Value				Weighted  Average Remaining  Contractual Term (years)
Balance as of December 31, 2013			106,341			$	3.62				8.45
Vested and expected to vest at December 31, 2013			106,341			$	3.62				8.45
Exercisable at December 31, 2013			85,341			$	3.95				8.13

Performance-based Restricted Stock Awards

The following table summarizes activity with respect to the performance based restricted stock awards during the year ended December 31, 2013:

		Restricted Stock Awards				Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2013			261,300			$	3.44
Granted			—				—
Vested			—				—
Cancelled/forfeited			(109,749	)		$	3.44
Outstanding at December 31, 2013			151,551			$	3.44
Vested at December 31, 2013			—				—

Compensation Cost Recognized for Stock Options and Restricted Stock Awards

The following summarizes the total compensation cost recognized for the stock options and restricted stock awards in the accompanying financial statements:

		Years ended December 31,
		2013				2012				2011
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0)		$	3,608,000			$	3,904,000			$	3,316,000

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