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Common Stock Common Stock (Tables)

12 Months Ended

Dec. 31, 2012

Common Stock [Abstract]

Schedule of reconciliation of changes in common shares issued

A reconciliation of the changes in common shares issued is as follows:

	Year ended December 31,
	2012			2011
Shares issued at the beginning of the year	51,957,652			36,753,891
Issued in sale of common stock	—			3,665,000
Issued upon conversion of preferred stock	—			4,871,719
Issued in payment of term loan principal	—			171,154
Issued in exchange of convertible notes	—			559,007
Issued upon exercise of warrants	348,350			3,960,747
Issued as dividend payments on preferred stock	—			624,171
Issued as restricted stock award grants	750,476			1,287,731
Issued upon exercise of stock options	67,500			64,232
Shares issued at the end of the year	53,123,978			51,957,652

Schedule of assumptions used in the Black-Scholes model for stock options granted

Assumptions used in the Black-Scholes option pricing model for stock options granted in 2011 and 2010 are as follows:

	Year ended December 31,
		2011			2010
Risk-free interest rate		.94%-1.825%			.55%-2.275%
Expected volatility of common stock		67.7%-70.3%			61.4%-69.3%
Expected life of options in years		3.50*-4.00			3.34*-6.25
Dividend yield		—	%		—	%
Vesting period in years		3.5-4.0			3.4-6.3

*Grants were made to an optionee for whom the Company was able to reasonably estimate the expected life of the award.

Schedule of stock option activity

A summary of stock option activity for the year ended December 31, 2012 is as follows:

Options		Shares			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding as of January 1, 2012		2,529,690			$	5.32
Exercised		(67,500	)		2.50
Expired		(4,604	)		13.81
Outstanding as of
December 31, 2012		2,457,586			$	5.65			7.14		$	16,673,502
Vested or expected to vest at
December 31, 2012		2,437,864			$	5.64			7.14		$	16,571,402
Options exercisable as of
December 31, 2012		1,318,436			$	3.56			6.58		$	11,728,379

Schedule of restricted stock activity

A summary of restricted stock activity for the year ended December 31, 2012 is as follows:

Restricted Stock		Shares			Weighted- Average Fair Value - Date of Grant
Non-vested at January 1, 2012		1,445,858			$	6.64
Granted		750,476			11.03
Vested		(842,730	)		6.51
Forfeited		(29,314	)		10.84
Non-vested at December 31, 2012		1,324,290			$	9.15

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Tabular disclosure of the change in common stock outstanding.

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

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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

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-Section 50

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

-Subparagraph (f)(2)

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