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Stock-based Compensation Expense | 6 Months Ended
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Jun. 30, 2024
Stock-based Compensation Expense [Abstract] |
Stock-based Compensation Expense | 9. Stock-based Compensation Expense The following table summarizes stock-based compensation expense for the three and six months ended June 30, 2024 and 2023 (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Cost of sales |  | $ | 246 |  |  | $ | 118 |  |  | $ | 450 |  |  | $ | 237 |
Research, development and patent expense |  |  | 22,766 |  |  |  | 19,249 |  |  |  | 44,991 |  |  |  | 38,816 |
Selling, general and administrative expense |  |  | 7,716 |  |  |  | 7,194 |  |  |  | 16,627 |  |  |  | 14,457 |
Total stock-based compensation expense |  | $ | 30,728 |  |  | $ | 26,561 |  |  | $ | 62,068 |  |  | $ | 53,510 |
As of June 30, 2024, total unrecognized estimated stock-based compensation expense related to non-vested stock options, RSUs and PRSUs was $61.6 million, $96.7 million and $13.8 million, respectively. Our actual expenses may differ from these estimates because we will adjust our unrecognized stock-based compensation expense for future forfeitures, including any PRSUs that do not vest. We expect to recognize the cost of stock-based compensation expense related to our non-vested stock options, RSUs and PRSUs over a weighted average amortization period of 1.3 years, 1.6 years and 1.9 years, respectively. Refer to Part IV, Item 15, Note 1, Organization and Significant Accounting Policies, of our audited financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2023 for further details on how we determine the fair value of stock options granted, RSUs, PRSUs and stock purchase rights under the ESPP. For the six months ended June 30, 2024 and 2023, we used the following weighted-average assumptions in our Black-Scholes calculations: Employee Stock Options:
|  | Six Months Ended June 30, |
|  | 2024 |  |  | 2023 |
Risk-free interest rate |  |  | 4.1 | % |  |  | 3.6 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 43.9 | % |  |  | 47.3 | %
Expected life |  | 6.3 years |  |  | 6.3 years |
ESPP:
|  | Six Months Ended June 30, |
|  | 2024 |  |  | 2023 |
Risk-free interest rate |  |  | 5.3 | % |  |  | 5.2 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 38.4 | % |  |  | 36.7 | %
Expected life |  | 6 months |  |  | 6 months |
RSUs: The weighted-average grant date fair value of RSUs granted to employees for the six months ended June 30, 2024 and 2023 was $52.60 and $39.50 per share, respectively. PRSUs: Under the terms of the PRSUs we granted in 2024 and 2023, 100 percent of the PRSUs may vest at the end of the three-year performance period based on our relative TSR as compared to a peer group of companies and as measured at the end of the performance period. Under the terms of the grants, no number of PRSUs is guaranteed to vest and the actual number of PRSUs that will vest at the end of each performance period may be anywhere from zero to 200 percent of the target number depending on our relative TSR. The weighted-average grant date fair value of PRSUs we granted to our executive officers for the six months ended June 30, 2024 and 2023 was $78.41 and $58.99 per share, respectively.

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