v3.3.1.900

Employee Stock and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation [Abstract]

Stock-based employee compensation

Stock-based compensation for employee stock options is included in the consolidated statements of operations as follows:

		Year Ended December 31,
		2015				2014				2013
		(in thousands)
Cost of revenues		$	1,250			$	757			$	421
Research and development		4,936				2,463				1,038
Sales and marketing		3,867				2,394				1,244
General and administrative		6,325				4,217				1,842
Total stock-based employee compensation		$	16,378			$	9,831			$	4,545

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:

		Year Ended December 31,
		2015		2014		2013
Expected term (in years)		4.9 to 5.9		5.3 to 5.9		5.4 to 6.1
Volatility		45% to 48%		48% to 52%		52% to 53%
Risk-free interest rate		1.3% to 1.7%		1.5% to 1.7%		0.7% to 1.5%
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, 2012		6,513,508			$	4.39			6.6		$	67,711
Granted		2,001,400			15.78
Exercised		(952,871	)		4.32
Canceled		(522,944	)		10.71
Balance as of December 31, 2013		7,039,093			7.17				6.5		112,312
Granted		2,744,150			26.16
Exercised		(1,216,710	)		6.28
Canceled		(961,126	)		16.91
Balance as of December 31, 2014		7,605,407			12.93				6.5		188,743
Granted		1,526,450			39.50
Exercised		(807,846	)		12.50
Canceled		(744,953	)		27.67
Balance as of December 31, 2015		7,579,058			16.88				5.9		131,345
Vested and expected to vest—December 31, 2015		7,111,282			15.69				5.7		130,208
Exercisable—December 31, 2015		5,195,339			9.78				4.8		121,098

Schedule of exercise price range, outstanding and vested

The following table summarizes the outstanding and vested stock options at December 31, 2015:

		Outstanding									Vested
Exercise Price		Number of Shares			Weighted Average Exercise Price Per Share				Weighted Average Remaining Contractual Life (Years)		Number of Shares			Weighted Average Exercise Price Per Share
$1.40 - $1.40		156,259			$	1.40			0.5		156,259			$	1.40
$1.90 - $1.90		940,082			1.90				1.1		940,082			1.90
$2.10 - $2.80		415,220			2.63				2.9		415,220			2.63
$3.80 - $3.80		1,117,235			3.80				3.9		1,117,235			3.80
$4.10 - $8.90		868,867			6.16				5.4		842,958			6.08
$9.40 - $16.68		786,624			13.13				6.9		606,364			12.95
$19.26 - $26.86		1,156,772			24.00				8.1		575,066			23.69
$30.58 - $30.58		827,997			30.58				8.7		423,645			30.58
$34.97 - $37.28		824,344			36.31				8.7		14,381			37.18
$40.68 - $52.14		485,658			45.13				8.9		75,635			41.39
		7,579,058			16.88				5.9		5,166,845			9.79

X

- 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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

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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

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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

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