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Stock Options Plans (Tables)

3 Months Ended

Mar. 31, 2013

Stock Options Plans [Abstract]

Stock option activity

Options granted under the Plans vest as determined by the Company's Compensation and Stock Option Committee and expire over varying terms, but not more than ten years from the date of grant. Stock option activity for the three months ended March 31, 2013 is as follows:

		Stock Option Activity under the Plans
		Stock Options				Exercise Price per Share				Weighted Average Exercise Price				Weighted Average Remaining Life (Years)
Outstanding at December 31, 2012			4,788,887			$	1.23-$15.54			$	4.79				6.88
Granted			921,220			$	1.31-$2.13				2.08
Forfeited			(115,945	)		$	1.82-$8.50				3.62
Outstanding at March 31, 2013			5,594,162			$	1.23-$15.54			$	4.37				7.13

Assumptions used to determine the fair value of stock options

The assumptions used in the option pricing model to determine the fair value of stock options awarded to employees are as follows:

	Three Months Ended March 31,
	2013		2012
Dividend yield	None		None
Expected volatility	86.16% - 86.51%		77.37% - 79.24%
Weighted average volatility	86.20%		78.75%
Risk-free interest rates	1.16% - 1.36%		1.03% - 1.49%
Expected life (in years)	6.8		6.0

Restricted stock activity

Restricted stock activity for the three months ended March 31, 2013 is as follows:

		Restricted Stock Activity under the Plans
		Restricted Stock				Weighted Average Grant Date Fair Value
Non-vested at December 31, 2012			501,468			$	3.26
Granted			11,850				1.42
Vested			(85,378	)			4.99
Forfeited			(17,123	)			3.70
Non-vested at March 31, 2013			410,817			$	2.82

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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