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Stock-based Compensation Expense (Tables)
6 Months Ended
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 life6.3 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 life6 months 6 months