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Stock-Based Awards (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Awards [Abstract]

Summary of options activity

		Options				Weighted- Average Exercise Price
Outstanding January 1, 2010			21,372,959			$	0.57
Granted			860,000				2.38
Forfeitures or expirations			(336,868	)			2.77
Exercised			(452,474	)			1.15
Outstanding at December 31, 2010			21,443,617				0.60
Granted			825,000				5.80
Forfeitures or expirations			(135,316	)			2.04
Exercised			(1,280,687	)			0.64
Outstanding at December 31, 2011			20,852,614				0.79
Granted			—				0.00
Forfeitures or expirations			(73,907	)			1.75
Exercised			(8,018,516	)			0.58
Outstanding at December 31, 2012			12,760,191			$	0.95

Summary of Stock Options Outstanding

		Options Outstanding												Options Exercisable
Range of Exercise Prices		Number Outstanding at December 31, 2012				Weighted- Average Remaining Contractual Life in Years				Weighted- Average Exercise Price				Number Exercisable at December 31, 2012				Weighted- Average Exercise Price				Aggregate Intrinsic Value at December 31, 2012
$0.03 – $0.45			5,901,953				1.5			$	0.09				5,901,953			$	0.09			$	35,573
$0.70 – $0.97			2,542,500				6.1				0.70				1,773,750				0.70				9,614
$1.07 – $1.80			2,267,439				4.0				1.07				1,474,609				1.07				7,445
$2.03 – $4.03			1,258,299				5.3				2.22				1,163,299				2.18				4,587
$5.05 – $5.26			470,000				8.1				5.07				12,500				5.26				11
$6.36 – $6.82			200,000				8.5				6.52				50,000				6.52				—
$7.01 – $8.51			120,000				8.7				7.48				30,000				7.48				—
			12,760,191				3.7			$	0.95				10,406,111			$	0.63			$	57,230

Summary of weighted average assumption used to estimate the Fair Value Option Pricing Model

		2011		2010
Expected life (years)		5.0		5.0
Risk free interest rate		0.84% to 2.32%		1.13% to 2.54%
Dividends		—		—
Volatility		67.00% to 70.62%		71.13% to 76.55%

Summary of Restricted Shares Outstanding

		Restricted Stock Awards
Unvested balance at January 1, 2010			4,430,123
Granted			554,011
Vested			(2,772,125	)
Forfeited			(53,500	)
Unvested balance at December 31, 2010			2,158,509
Granted			561,526
Vested			(1,382,376	)
Forfeited			(26,288	)
Unvested balance at December 31, 2011			1,311,371
Granted			1,209,114
Vested			(1,209,121	)
Forfeited			(30,220	)
Unvested balance at December 31, 2012			1,281,144

X

- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) outstanding.

+ 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 (e)(1)

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

+ References

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Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible).

+ 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 (e)

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

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