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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 01, 2022
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, |  |
| 2022 |  | 2021 |  |  |  |  |  |
Research and development | $ | 8,899 |  |  | $ | 12,396 |  |  |  |  |  |  |
Selling, general and administrative | 10,860 |  |  | 22,257 |  |  |  |  |  |  |
Total stock-based compensation expense | $ | 19,759 |  |  | $ | 34,653 |  |  |  |  |  |  |
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, |  |
| 2022 |  | 2021 |  |  |  |
Stock options | $ | 3,678 |  |  | $ | 4,694 |  |  |  |  |
Restricted stock units | 13,073 |  |  | 11,669 |  |  |  |  |
Performance stock units | 1,709 |  |  | 17,947 |  |  |  |  |
ESPP | 1,299 |  |  | 343 |  |  |  |  |
Total stock-based compensation expense | $ | 19,759 |  |  | $ | 34,653 |  |  |  |  |
Schedule of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions | We used a Monte Carlo simulation model and the following assumptions to determine the grant date fair value of $33.17 per share for the TSR-based RSUs:
Fair value of the Company’s common stock on grant date | $ | 20.70 |
Expected volatility | 46.85 | %
Risk-free interest rate | 1.59 | %
Dividend yield | — | %

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