v2.4.0.6

Employee Stock and Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

Employee Stock and Benefit Plans [Abstract]

Stock-based employee compensation

Stock-based employee compensation is included in the condensed consolidated statements of income as follows:

	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2012				2011				2012				2011
	(in thousands)
Cost of revenues	$	68			$	44			$	191			$	94
Research and development	167				118				461				334
Sales and marketing	306				173				746				399
General and administrative	244				204				723				603
Total stock-based employee compensation	$	785			$	539			$	2,121			$	1,430

Fair value assumptions of options granted to employees

The fair value of each option granted to employees is estimated on the date of grant using the Black-Scholes option-pricing model based on the following assumptions:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2012		2011		2012		2011
Expected term (in years)	5.3 - 6.0		5.6		5.3 - 6.0		5.6
Volatility	53%		55%		53%		55%
Risk-free interest rate	0.6% - 0.7%		1.0% - 1.6%		0.6% - 0.8%		1.0% - 2.3%
Dividend yield	—		—		—		—

Stock option activity

A summary of the Company’s stock option activity is as follows:

	Outstanding Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
										(in thousands)
Balance as of December 31, 2011	6,312,041			$	3.36			6.9		$	16,012
Granted	1,322,906			8.39
Exercised	(703,459	)		2.84
Canceled	(392,389	)		6.85
Balance as of September 30, 2012	6,539,099			4.23				7.0		$	64,953
Vested and expected to vest - September 30, 2012	6,100,152			4.00				6.9
Exercisable - September 30, 2012	6,537,727			4.23				7.0

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

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



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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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)

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- Definition

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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