Stock-Based Awards (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Classification of Stock-Based Compensation Expense

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

	Three Months Ended March 31,
(in thousands)	2020		2019
Research and development expenses	$	3,271	$	1,692
Selling, general, and administrative expenses	3,723		4,537
Total stock-based compensation	$	6,994	$	6,229