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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 02, 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 March 31,
|  |  |  |  | 2021 |  | 2020 |  |
Research and development |  |  |  |  | $ | 12,396 |  |  | $ | 5,086 |  |  |
Selling, general and administrative |  |  |  |  | 22,257 |  |  | 8,896 |  |  |
Total stock-based compensation expense |  |  |  |  | $ | 34,653 |  |  | $ | 13,982 |  |  |
Stock-based compensation for each type of award under our equity incentive plans and ESPP were as follows (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Stock options |  |  |  |  | $ | 4,694 |  |  | $ | 4,994 |
Restricted stock units |  |  |  |  | 11,669 |  |  | 7,797 |
Performance stock units |  |  |  |  | 17,947 |  |  | 496 |
ESPP |  |  |  |  | 343 |  |  | 695 |
Total stock-based compensation expense |  |  |  |  | $ | 34,653 |  |  | $ | 13,982 |
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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