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Stock-based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2024
Stock-based Compensation Expense [Abstract] |
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 |
Weighted-Average Assumptions for Stock Options | 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 |
Weighted-Average Assumptions for ESPP | 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 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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