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Stock-Based Compensation (Tables) | 9 Months Ended
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Oct. 01, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Allocated Employee Stock-Based Compensation Expense | We allocated the stock-based compensation expense for our equity incentive plans and our Employee Stock Purchase Plan (ESPP) as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |
Research and development | $ | 11,487 |  |  | $ | 18,936 |  |  | $ | 37,550 |  |  | $ | 30,134 |  |  |
Selling, general and administrative | 22,479 |  |  | 36,719 |  |  | 59,104 |  |  | 55,657 |  |  |
Total stock-based compensation expense | $ | 33,966 |  |  | $ | 55,655 |  |  | $ | 96,654 |  |  | $ | 85,791 |  |  |
Stock-based compensation for each type of award under our equity incentive plans and ESPP were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock options | $ | 4,607 |  |  | $ | 5,021 |  |  | $ | 15,203 |  |  | $ | 15,316 |
Restricted stock units | 13,721 |  |  | 8,816 |  |  | 40,802 |  |  | 25,212 |
Performance stock units | 14,971 |  |  | 41,226 |  |  | 37,616 |  |  | 43,151 |
ESPP | 667 |  |  | 592 |  |  | 3,033 |  |  | 2,112 |
Total stock-based compensation expense | $ | 33,966 |  |  | $ | 55,655 |  |  | $ | 96,654 |  |  | $ | 85,791 |
Schedule of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions | A Monte Carlo simulation model was used to determine the grant date fair value of $24.54 for the 2021 PSUs based on the following assumptions:
Fair value of the Company’s common stock on grant date | $ | 21.31 |
Expected volatility | 49 | %
Risk-free interest rate | 0.29 | %
Dividend yield | — | %

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