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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Notes To Financial Statements [Abstract]

The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three and six months ended June 30, 2018 and 2017 is as follows (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of net revenues	$	900	$	768	$	1,781	$	1,693
Selling, general and administrative	13,216		11,218		25,794		22,934
Research and development	2,774		2,259		5,145		4,430
Total stock-based compensation	$	16,890	$	14,245	$	32,720	$	29,057

Stock Option Activity

Activity for the six months ended June 30, 2018 under the stock option plans is set forth below:



	Number of Shares Underlying Stock Options (in thousands)		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2017	75		$	11.36
Exercised	(61	)	12.13
Cancelled or expired	—		—
Outstanding as of June 30, 2018	14		$	7.96	0.62	$	4,651
Vested at June 30, 2018	14		$	7.96	0.62	$	4,651
Exercisable at June 30, 2018	14		$	7.96	0.62	$	4,651

Summary Of Restricted Stock Units

A summary for the six months ended June 30, 2018 is as follows:



	Shares Underlying RSUs (in thousands)		Weighted Average Grant Date Fair Value		Weighted Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Nonvested as of December 31, 2017	1,341		$	82.30
Granted	214		256.85
Vested and released	(491	)	71.93
Forfeited	(65	)	98.99
Nonvested as of June 30, 2018	999		$	123.73	1.44	$	341,829

Summary Of Market-performance Based Restricted Stock Units

The following table summarizes the MSU performance for the six months ended June 30, 2018:



	Number of Shares Underlying MSUs (in thousands)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Nonvested as of December 31, 2017	428		$	78.53
Granted	208		261.86
Vested and released	(312	)	62.41
Forfeited	—		—
Nonvested as of June 30, 2018	324		$	211.91	1.66	$	110,922

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The fair value of the option component of the 2010 Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:



	Six Months Ended June 30,
	2018			2017
Expected term (in years)	1.3			1.2
Expected volatility	35.7		%	26.1		%
Risk-free interest rate	1.9		%	0.9		%
Expected dividends	—			—
Weighted average fair value at grant date	$	78.38		$	26.09