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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |
Research and development | $ | 13,667 |  |  | $ | 6,112 |  |  | $ | 26,063 |  |  | $ | 11,198 |  |  |
Selling, general and administrative | 14,368 |  |  | 10,042 |  |  | 36,625 |  |  | 18,938 |  |  |
Total stock-based compensation expense | $ | 28,035 |  |  | $ | 16,154 |  |  | $ | 62,688 |  |  | $ | 30,136 |  |  |
Stock-based compensation for each type of award under our equity incentive plans and ESPP were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock options | $ | 5,902 |  |  | $ | 5,301 |  |  | $ | 10,596 |  |  | $ | 10,295 |
Restricted stock units | 15,412 |  |  | 8,599 |  |  | 27,081 |  |  | 16,396 |
Performance stock units | 4,698 |  |  | 1,429 |  |  | 22,645 |  |  | 1,925 |
ESPP | 2,023 |  |  | 825 |  |  | 2,366 |  |  | 1,520 |
Total stock-based compensation expense | $ | 28,035 |  |  | $ | 16,154 |  |  | $ | 62,688 |  |  | $ | 30,136 |
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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