Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2016

Stockholders' Equity

Schedule of key assumptions to determine fair value of options

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Average volatility	33.0	%	24.9	%	30.4	%	27.1	%
Risk-free interest rate	0.9	%	1.1	%	1.5	%	1.2	%
Weighted-average expected life in years	3.0		3.2		5.5		4.5
Dividend yield rate	—	%	—	%	—	%	—	%

Schedule of the summary of option activity under all plans

				Weighted-Average
		Weighted-Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Options	Price		Term (Years)	Value(1)
					(in thousands)
Outstanding as of December 31, 2015	12,240,467	$	15.41
Options granted	2,382,036		12.15
Options exercised	(280,303)		11.61
Options cancelled	(126,225)		13.46
Options expired	(233,136)		24.11
Outstanding as of June 30, 2016	13,982,839	$	14.80	4.62	$	37,001
Exercisable as of June 30, 2016	8,039,685	$	16.02	3.25	$	19,081

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the estimated fair value of the Company’s common stock for those awards that have an exercise price below the estimated fair value at June 30, 2016.

Schedule of information relating to options grants

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
	(in thousands, except per share data)
Weighted-average grant date fair value	$	3.88	$	2.89	$	3.40	$	3.44
Intrinsic value of options exercised		967		2,264		982		2,453
Cash received		3,149		9,531		3,253		10,441
Total fair value of the options vested during the year		2,000		1,112		5,260		2,536

Schedule of the summary of nonvested options status

		Weighted-Average
		Grant Date
	Options	Fair Value
Nonvested as of December 31, 2015	5,202,095	$	3.44
Options granted	2,382,036		3.40
Options vested	(1,514,752)		3.47
Options forfeited	(126,225)		4.65
Nonvested as of June 30, 2016	5,943,154		3.39

Schedule of information relating to RSU grants and deliveries

		Total Fair Market
		Value of RSUs
		Issued
	Total RSUs	as
	Issued	Compensation(1)
		(in thousands)
RSUs outstanding at December 31, 2015	866,540
RSUs granted	726,830	$	8,549
RSUs forfeited	(39,070)
Common stock delivered	(207,569)
RSUs surrendered for taxes	(102,641)
RSUs outstanding at June 30, 2016	1,244,090

The total fair market value is derived from the number of RSUs granted times the current stock price on the date of grant.

Schedule of recorded share-based compensation expense under all plans

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
	(in thousands)
Cost of revenues	$	771	$	730	$	1,570	$	1,218
Operating expenses:
Selling, distribution and marketing		65		59		131		99
General and administrative		3,100		2,650		5,746		4,140
Research and development		262		261		602		473
Total share-based compensation	$	4,198	$	3,700	$	8,049	$	5,930

Schedule of changes in stockholders' equity

	Six Months
	Ended
	June 30,
	2016
	(in thousands)
Stockholders’ equity as of December 31, 2015	$	295,510
Net income		9,384
Accumulated other comprehensive loss		(215)
Exercise of stock options		3,253
Issuance of common stock to employees under ESPP		915
Nonemployee share-based compensation expense		815
Employee share-based compensation expense		7,234
Repurchase of common stock(1)		(1,242)
Purchase of treasury stock		(8,190)
Stockholders’ equity as of June 30, 2016	$	307,464

⁽¹⁾ Repurchase of common stock relating to the tax withholding of equity award settlements.