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Stockholders’ Equity (Tables) | 9 Months Ended
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Sep. 29, 2023
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 September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022 |  |
Research and development | $ | 12,438 |  |  | $ | 16,438 |  |  | $ | 25,279 |  |  | $ | 34,886 |  |  |
Selling, general and administrative | 28,040 |  |  | 20,899 |  |  | 56,760 |  |  | 46,832 |  |  |
Total stock-based compensation expense | $ | 40,478 |  |  | $ | 37,337 |  |  | $ | 82,039 |  |  | $ | 81,718 |  |  |
Stock-based compensation expense for each type of award under our equity incentive plans and ESPP were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Stock options | $ | 1,882 |  |  | $ | 3,299 |  |  | $ | 5,966 |  |  | $ | 10,470 |
RSUs | 18,440 |  |  | 22,233 |  |  | 50,804 |  |  | 54,234 |
PSUs | 19,463 |  |  | 11,331 |  |  | 22,129 |  |  | 14,621 |
ESPP | 693 |  |  | 474 |  |  | 3,140 |  |  | 2,393 |
Total stock-based compensation expense | $ | 40,478 |  |  | $ | 37,337 |  |  | $ | 82,039 |  |  | $ | 81,718 |
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 $26.05 per share for the 2023 TSR-based RSUs:
Fair value of Exelixis common stock on grant date | $ | 19.48 |
Expected volatility | 40.26 | %
Risk-free interest rate | 3.75 | %
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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