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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Stock-based Compensation [Abstract]

Stock Option Activity

A summary of activity for the year ended December 31, 2014 is as follows:

		Options				Weighted Average Exercise Price
Balance as of January 1, 2014			8,322,289			$	4.55
Granted			3,058,190			$	1.99
Exercised			(2,667	)		$	2.62
Expired			(396,328	)		$	4.14
Cancelled/forfeited			(1,866,136	)		$	3.45
Balance as of December 31, 2014			9,115,348			$	3.93

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, 2014			9,115,348			$	3.93				6.31			$	584.4
Vested and expected to vest at December 31, 2014			9,064,341			$	3.94				6.30			$	560.47
Exercisable at December 31, 2014			6,230,987			$	4.70				5.06			$	—

Weighted-average Assumptions

The fair value of each option awarded during the year ended December 31, 2014, 2013 and 2012 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,
		2014				2013				2012
Expected term		6.0 years				6.0 years				5.2 years
Risk-free interest rate			1.86	%			1.12	%			0.83	%
Volatility			77.52	%			75.27	%			75.63	%
Dividends			—				—				—
Resulting weighted average grant date fair value		$	1.35			$	1.72			$	1.96

Restricted Stock Awards Activity

A summary of activity for the year ended December 31, 2014 is as follows:

		Restricted Stock Awards				Weighted Average Grant Date Fair Value
Balance as of January 1, 2014			106,341			$	3.62
Granted			115,808			$	2.50
Exercised/Released			(12,200	)		$	2.80
Cancelled/forfeited			(16,826	)		$	2.51
Balance as of December 31, 2014			193,123			$	3.10

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, 2014			193,123			$	3.10				8.32
Vested and expected to vest at December 31, 2014			193,123			$	3.10				7.21
Exercisable at December 31, 2014			83,641			$	3.91				8.32

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,
		2014				2013				2012
Total compensation cost for share-based payment arrangements recognized in the statement of operations (net of tax of $0)		$	3,101,000			$	3,608,000			$	3,904,000

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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