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Stockholders’ Equity (Tables) | 6 Months Ended
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Jun. 28, 2024
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 Amended ESPP as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023 |  |
Research and development | $ | 9,178 |  |  | $ | 9,589 |  |  | $ | 13,070 |  |  | $ | 12,841 |  |  |
Selling, general and administrative | 16,176 |  |  | 15,311 |  |  | 31,397 |  |  | 28,720 |  |  |
Total stock-based compensation expense | $ | 25,354 |  |  | $ | 24,900 |  |  | $ | 44,467 |  |  | $ | 41,561 |  |  |
Stock-based compensation expense for each type of award under our equity incentive plans and Amended ESPP were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Stock options | $ | 1,524 |  |  | $ | 1,877 |  |  | $ | 3,262 |  |  | $ | 4,084 |
Restricted stock units | 22,164 |  |  | 19,757 |  |  | 37,598 |  |  | 32,364 |
Performance stock units | 1,097 |  |  | 1,872 |  |  | 1,824 |  |  | 2,666 |
Employee stock purchase plan | 569 |  |  | 1,394 |  |  | 1,783 |  |  | 2,447 |
Total stock-based compensation expense | $ | 25,354 |  |  | $ | 24,900 |  |  | $ | 44,467 |  |  | $ | 41,561 |
Schedule Of Share-Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions | We used a Monte Carlo simulation model and the following weighted-average assumptions to determine the weighted-average grant date fair value of $20.19 per share for the 2024 TSR-based RSUs:
Fair value of Exelixis common stock on grant date | $ | 21.71 |
Expected volatility | 36.68 | %
Risk-free interest rate | 4.42 | %
Dividend yield | — | %

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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