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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Stockholders' Equity Note [Abstract]  
Stock-based Compensation Expense The stock-based compensation related to our stock-based awards and employee stock purchase plans for the three and nine months ended September 30, 2020 and 2019 is as follows (in thousands): 
 Three Months Ended
September 30, 		Nine Months Ended
September 30,
 2020201920202019
Cost of net revenues$1,247 $1,354 $3,485 $3,744 
Selling, general and administrative19,951 19,394 58,284 54,321 
Research and development4,031 3,428 11,394 9,622 
Total stock-based compensation$25,229 $24,176 $73,163 $67,687 
Summary Of Restricted Stock Units A summary for the nine months ended September 30, 2020 is as follows:
Number of Shares
Underlying RSUs
(in thousands)
Weighted Average Grant Date Fair ValueWeighted Average Remaining
Contractual Term (in years)
Aggregate
Intrinsic
 Value
(in thousands)
Unvested as of December 31, 2019696 $190.60 
Granted
298 266.07 
Vested and released(308)150.22 
Forfeited(34)233.59 
Unvested as of September 30, 2020652 $241.90 1.4$213,410 
Summary Of Market-performance Based Restricted Stock Units
A summary for the nine months ended September 30, 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 September 30, 2020227 $430.50 1.4$74,391 
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,
 2020201920202019
Expected term (in years)1.01.51.01.4
Expected volatility71.7 %52.0 %55.0 %50.1 %
Risk-free interest rate0.1 %1.8 %0.9 %2.2 %
Expected dividends— — — — 
Weighted average fair value at grant date$117.32 $80.42 $96.94 $86.02