Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Allocation of Employee Stock-Based Compensation

The following table summarizes the aggregate stock-based compensation expense recorded in the consolidated statements of comprehensive loss related to stock options and RSUs during the three months ended March 31, 2021 and 2020, respectively (in millions): 

	Three Months Ended March 31,
	2021		2020
Research and development	$	3.7	$	2.8
Selling, general and administrative	6.8		6.2
Total	$	10.5	$	9.0