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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 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 the employee stock purchase plan) is summarized in the following table:
 Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2024202320242023
Cost of product sales$762 $660 $2,914 $2,341 
Research and development1,095 892 3,281 2,862 
Selling, general and administrative7,367 6,372 22,383 20,213 
Total non-cash stock-based compensation expense$9,224 $7,924 $28,578 $25,416