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Stockholders’ Equity (Tables) | 9 Months Ended
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Oct. 03, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Allocated Stock-Based Compensation | We allocated the stock-based compensation for our 2017 Plan and our 2000 Employee Stock Purchase Plan (as amended and restated, the Amended ESPP) as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Research and development | $ | 10,353 |  |  | $ | 8,764 |  |  | $ | 34,018 |  |  | $ | 21,834 |
Selling, general and administrative | 20,532 |  |  | 14,259 |  |  | 58,868 |  |  | 45,656 |
Total stock-based compensation | $ | 30,885 |  |  | $ | 23,023 |  |  | $ | 92,886 |  |  | $ | 67,490 |
Stock-based compensation for each type of award under our 2017 Plan and Amended ESPP were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Stock options | $ | 493 |  |  | $ | 1,397 |  |  | $ | 2,224 |  |  | $ | 4,659 |
Restricted stock units | 29,660 |  |  | 20,626 |  |  | 87,388 |  |  | 58,224 |
Performance stock units | — |  |  | 370 |  |  | 241 |  |  | 2,194 |
Employee stock purchase plan | 732 |  |  | 630 |  |  | 3,033 |  |  | 2,413 |
Total stock-based compensation | $ | 30,885 |  |  | $ | 23,023 |  |  | $ | 92,886 |  |  | $ | 67,490 |
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 $47.58 per share for the 2025 TSR-based RSUs and $25.26 per share for the 2025 stock price target-based RSUs:
| 2025 TSR-based RSUs |  | 2025 stock price target-based RSUs
Fair value of Exelixis common stock on grant date | $ | 37.53 |  |  | $ | 37.09 |
Expected volatility | 32.6 | % |  | 38.3 | %
Risk-free interest rate | 4.0 | % |  | 3.9 | %
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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