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Stock-based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2025 and 2024 (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
|  | 2025 |  |  |  | 2024 |  |  |  | 2025 |  |  |  | 2024 |
Cost of sales | $ | 610 |  |  | $ | 246 |  |  | $ | 710 |  |  | $ | 450 |
Research, development and patent expense |  | 19,542 |  |  |  | 22,766 |  |  |  | 39,840 |  |  |  | 44,991 |
Selling, general and administrative expense |  | 9,538 |  |  |  | 7,716 |  |  |  | 18,858 |  |  |  | 16,627 |
Stock-based compensation expense, net of amounts capitalized |  | 29,690 |  |  |  | 30,728 |  |  |  | 59,408 |  |  |  | 62,068 |
Capitalized stock-based compensation expense |  | 509 |  |  |  | - |  |  |  | 1,000 |  |  |  | - |
Total stock-based compensation expense | $ | 30,199 |  |  | $ | 30,728 |  |  | $ | 60,408 |  |  | $ | 62,068 |
Weighted-Average Assumptions for Stock Options | Employee Stock Options:
| Six Months Ended
| June 30,
|  | 2025 |  |  |  | 2024 |
Risk-free interest rate |  | 4.5 | % |  |  | 4.1 | %
Dividend yield |  | 0.0 | % |  |  | 0.0 | %
Volatility |  | 42.0 | % |  |  | 43.9 | %
Expected life |  | 6.3 years |  |  |  | 6.3 years |
Weighted-Average Assumptions for ESPP | ESPP:
| Six Months Ended
| June 30,
|  | 2025 |  |  |  | 2024 |
Risk-free interest rate |  | 4.3 | % |  |  | 5.3 | %
Dividend yield |  | 0.0 | % |  |  | 0.0 | %
Volatility |  | 41.3 | % |  |  | 38.4 | %
Expected life |  | 6 months |  |  |  | 6 months |

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: 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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