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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Stockholders' Equity Note [Abstract]  
Stock-based Compensation Expense The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three months ended March 31, 2020 and 2019 is as follows (in thousands): 
 Three Months Ended
March 31,
 20202019
Cost of net revenues$1,347  $1,112  
Selling, general and administrative18,130  16,890  
Research and development3,450  3,042  
Total stock-based compensation$22,927  $21,044  
Summary Of Restricted Stock Units A summary for the three months ended March 31, 2020 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)
Unvested as of December 31, 2019696  $190.60  
Granted
251  272.24  
Vested and released(259) 145.91  
Forfeited(11) 233.45  
Unvested as of March 31, 2020677  $237.27  1.8$117,738  
Summary Of Market-performance Based Restricted Stock Units
A summary for the three months ended March 31, 2020 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)
Unvested as of December 31, 2019244  $331.35  
Granted156  242.04  
Vested and released(173) 120.39  
Unvested as of March 31, 2020227  $430.50  1.9$39,529  
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
March 31,
 20202019
Expected term (in years)1.01.4
Expected volatility41.7 %48.6 %
Risk-free interest rate1.5 %2.5 %
Expected dividends—  —  
Weighted average fair value at grant date$80.54  $90.36