Stock-Based Awards (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Classification of Stock-Based Compensation Expense

Stock-based compensation expense was classified in the consolidated statements of operations and comprehensive loss as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2020		2019		2020		2019
Research and development expenses	$	5,293	$	1,790	$	8,564	$	3,482
Selling, general, and administrative expenses	5,316		2,317		9,039		6,854
Total stock-based compensation	$	10,609	$	4,107	$	17,603	$	10,336