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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of non-cash stock-based compensation expense
Non-cash stock-based compensation expense (service-based stock options, restricted stock units and employee stock purchase plan) is summarized in the following table:
 Three Months Ended March 31,
(in thousands)20242023
Cost of product sales$1,241 $885 
Research and development1,221 977 
Selling, general and administrative7,372 6,869 
Total non-cash stock-based compensation expense$9,834 $8,731