Stockholders' Equity (Tables)
|
12 Months Ended |
Dec. 31, 2015 |
Stock-based Compensation Expense |
The stock-based compensation related to all of our stock-based awards and employee stock purchases for the year ended December 31, 2015, 2014 and 2013 is as follows (in thousands): | | | | | | | | | | | | | | For the Year Ended December 31, | | 2015 | | 2014 | | 2013 | Cost of net revenues | $ | 3,938 |
| | $ | 3,616 |
| | $ | 2,565 |
| Selling, general and administrative | 40,813 |
| | 29,625 |
| | 20,354 |
| Research and development | 8,192 |
| | 6,582 |
| | 3,519 |
| Total stock-based compensation | $ | 52,943 |
| | $ | 39,823 |
| | $ | 26,438 |
|
|
Stock Option Activity |
Activity for the year ended December 31, 2015, under the stock option plans are set forth below (in thousands, except years and per share amounts): | | | | | | | | | | | | | | | Stock Options | | Number of Shares Underlying Stock Options | | Weighted Average Exercise Price per Share | | Weighted Average Remaining Contractual Term (in years ) | | Aggregate Intrinsic Value | Outstanding as of December 31, 2014 | 668 |
| | 15.57 |
| | | | | Granted | — |
| | — |
| | | | | Exercised | (172 | ) | | 16.82 |
| | | | | Cancelled or expired | — |
| | — |
| | | | | Outstanding as of December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
| Vested and expected to vest at December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
| Exercisable at December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
|
|
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used |
The following weighted-average assumptions used in the Monte Carlo simulation were as follows: | | | | | | | | | | | | | | Year Ended December 31, | | 2015 | | 2014 | | 2013 | Expected term (in years) | 3 |
| | 3 |
| | 3 |
| Expected volatility | 36.9 | % | | 46.0 | % | | 47.0 | % | Risk-free interest rate | 1.0 | % | | 0.7 | % | | 0.4 | % | Expected dividends | — |
| | — |
| | — |
| Weighted average fair value per share at grant date | $ | 61.73 |
| | $ | 50.46 |
| | $ | 35.49 |
|
|
2001 Purchase Plan |
|
Weighted Average Assumptions Used for the Fair Value of Options Component of Purchase Plan Granted Estimated at Grant Date |
The fair value of the option component of the Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions: | | | | | | | | | | | | | | Year Ended December 31, | | 2015 | | 2014 | | 2013 | Employee Stock Purchase Plan: | | | | | | Expected term (in years) | 1.2 |
| | 1.2 |
| | 1.2 |
| Expected volatility | 31.1 | % | | 38.8 | % | | 44.9 | % | Risk-free interest rate | 0.3 | % | | 0.2 | % | | 0.2 | % | Expected dividends | — |
| | — |
| | — |
| Weighted average fair value at grant date | $ | 16.19 |
| | $ | 17.15 |
| | $ | 11.69 |
|
|
Stock Option |
|
Weighted Average Assumptions Used for the Fair Value of Options Component of Purchase Plan Granted Estimated at Grant Date |
Activity for the year ended December 31, 2015, under the stock option plans are set forth below (in thousands, except years and per share amounts): | | | | | | | | | | | | | | | Stock Options | | Number of Shares Underlying Stock Options | | Weighted Average Exercise Price per Share | | Weighted Average Remaining Contractual Term (in years ) | | Aggregate Intrinsic Value | Outstanding as of December 31, 2014 | 668 |
| | 15.57 |
| | | | | Granted | — |
| | — |
| | | | | Exercised | (172 | ) | | 16.82 |
| | | | | Cancelled or expired | — |
| | — |
| | | | | Outstanding as of December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
| Vested and expected to vest at December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
| Exercisable at December 31, 2015 | 496 |
| | $ | 15.14 |
| | 2.05 | | $ | 25,163 |
|
|
Restricted Stock Units (RSUs) |
|
Summary Of Nonvested Shares |
A summary for the year ended December 31, 2015, is as follows (in thousands, except years and per share amounts): | | | | | | | | | | | | | | | Shares Underlying RSUs | | Weighted Average Grant Date Fair Value | | Weighted Remaining Vesting Period (in years) | | Aggregate Intrinsic Value | Nonvested as of December 31, 2014 | 2,124 |
| | $ | 42.08 |
| | | | | Granted | 843 |
| | 57.78 |
| | | | | Vested and released | (781 | ) | | 38.41 |
| | | | | Forfeited | (107 | ) | | 49.42 |
| | | | | Nonvested as of December 31, 2015 | 2,079 |
| | $ | 49.45 |
| | 1.16 | | $ | 136,857 |
|
|
Market Performance Based Restricted Stock Units |
|
Summary Of Nonvested Shares |
The following table summarizes the MSU performance as of December 31, 2015: | | | | | | | | | | | | | | Number of Shares Underlying MSUs (in thousands) | | Weighted Average Grant Date Fair Value | | Weighted Average Remaining Vesting Period (in years ) | | Aggregate Intrinsic Value (in thousands) | Nonvested as of December 31, 2014 | 498 |
| | 42.00 |
| |
| |
|
| Granted | 289 |
| | 55.92 |
| | | | | Vested and released | (162 | ) | | 30.28 |
| | | | | Forfeited | (14 | ) | | 53.69 |
| | | | | Nonvested as of December 31, 2015 | 611 |
| | 51.41 |
| | 1.30 | | $ | 40,244 |
|
|