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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Cost of product sales$911 $796 $2,152 $1,681 
Research and development965 993 2,186 1,970 
Selling, general and administrative7,644 6,972 15,016 13,841 
Total non-cash stock-based compensation expense$9,520 $8,761 $19,354 $17,492