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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021 |  |
Research and development | $ | 16,438 |  |  | $ | 11,487 |  |  | $ | 34,886 |  |  | $ | 37,550 |  |  |
Selling, general and administrative | 20,899 |  |  | 22,479 |  |  | 46,832 |  |  | 59,104 |  |  |
Total stock-based compensation expense | $ | 37,337 |  |  | $ | 33,966 |  |  | $ | 81,718 |  |  | $ | 96,654 |  |  |
Stock-based compensation 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,
| 2022 |  | 2021 |  | 2022 |  | 2021
Stock options | $ | 3,299 |  |  | $ | 4,607 |  |  | $ | 10,470 |  |  | $ | 15,203 |
Restricted stock units | 22,233 |  |  | 13,721 |  |  | 54,234 |  |  | 40,802 |
Performance stock units | 11,331 |  |  | 14,971 |  |  | 14,621 |  |  | 37,616 |
ESPP | 474 |  |  | 667 |  |  | 2,393 |  |  | 3,033 |
Total stock-based compensation expense | $ | 37,337 |  |  | $ | 33,966 |  |  | $ | 81,718 |  |  | $ | 96,654 |
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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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