Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

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 June 30,				Six Months Ended June 30,
(in thousands)	2023		2022		2023		2022
Cost of product sales	$	796	$	1,035	$	1,681	$	2,153
Research and development	993		1,520		1,970		2,870
Selling, general and administrative	6,972		8,253		13,841		15,316
Total non-cash stock-based compensation expense	$	8,761	$	10,808	$	17,492	$	20,339