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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Notes To Financial Statements [Abstract]  
Stock-based Compensation Expense
The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three and nine months ended September 30, 2018 and 2017 is as follows (in thousands): 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Cost of net revenues
$
966

 
$
833

 
$
2,747

 
$
2,526

Selling, general and administrative
15,403

 
11,880

 
41,197

 
34,814

Research and development
2,829

 
2,254

 
7,974

 
6,684

Total stock-based compensation
$
19,198

 
$
14,967

 
$
51,918

 
$
44,024
Stock Option Activity
Activity for the nine months ended September 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
(63
)
 
11.99

 
 
 
 
Cancelled or expired
—

 
—

 
 
 
 
Outstanding as of September 30, 2018
12

 
$
7.99

 
0.41
 
$
4,534

Vested at September 30, 2018
12

 
$
7.99

 
0.41
 
$
4,534

Exercisable at September 30, 2018
12

 
$
7.99

 
0.41
 
$
4,534
Summary Of Restricted Stock Units
A summary for the nine months ended September 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
225

 
261.52

 
 
 
 
Vested and released
(516
)
 
73.44

 
 
 
 
Forfeited
(74
)
 
105.53

 
 
 
 
Nonvested as of September 30, 2018
976

 
$
126.52

 
1.23
 
$
381,710
Summary Of Market-performance Based Restricted Stock Units
The following table summarizes the MSU performance for the nine months ended September 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

 
266.78

 
 
 
 
Vested and released
(312
)
 
62.41

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Nonvested as of September 30, 2018
324

 
$
215.07

 
1.41
 
$
126,834
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:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Expected term (in years)
1.2
 
1.2
 
1.3

 
1.2

Expected volatility
35.7
%
 
28.8
%
 
35.2
%
 
26.8
%
Risk-free interest rate
2.5
%
 
1.2
%
 
2.2
%
 
1.0
%
Expected dividends
—

 
—

 
—

 
—

Weighted average fair value at grant date
$
109.58

 
$
47.02

 
$
94.71

 
$
31.36