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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
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 six months ended June 30, 2019 and 2018 is as follows (in thousands): 
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Cost of net revenues
 
$
1,278

 
$
900

 
$
2,390

 
$
1,781

Selling, general and administrative
 
18,037

 
13,216

 
34,927

 
25,794

Research and development
 
3,152

 
2,774

 
6,194

 
5,145

Total stock-based compensation
 
$
22,467

 
$
16,890

 
$
43,511

 
$
32,720
Summary Of Restricted Stock Units A summary for the six months ended June 30, 2019 is as follows:
 
 
Number of Shares
Underlying RSUs
(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, 2018
931

 
$
129.39

 
 
 
 
Granted
269

 
256.81

 
 
 
 
Vested and released
(391
)
 
100.51

 
 
 
 
Forfeited
(43
)
 
171.64

 
 
 
 
Nonvested as of June 30, 2019
766

 
$
186.47

 
1.5
 
$
209,599
Summary Of Market-performance Based Restricted Stock Units six months ended June 30, 2019 is as follows: 
 
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, 2018
324

 
$
215.07

 
 
 
 
Granted
133

 
245.69

 
 
 
 
Vested and released
(179
)
 
72.74

 
 
 
 
Forfeited
(5
)
 
265.42

 
 
 
 
Nonvested as of June 30, 2019
273

 
$
322.53

 
1.6
 
$
74,615
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,
 
 
2019
 
2018
Expected term (in years)
 
1.4

 
1.3

Expected volatility
 
48.6
%
 
35.7
%
Risk-free interest rate
 
2.5
%
 
1.9
%
Expected dividends
 
—

 
—

Weighted average fair value at grant date
 
$
90.36

 
$
78.38