Akcea Merger (Tables)

12 Months Ended

Dec. 31, 2021

Akcea Merger [Abstract]

Akcea Merger

The following table summarizes the severance and retention expenses related to the Akcea Merger that we recognized for the periods indicated (in millions):

	Year Ended December 31, 2021		Year Ended December 31, 2020
R&D expenses	$	5.1	$	3.9
SG&A expenses		6.6		11.4
Total	$	11.7	$	15.3

The following table summarizes the severance and retention reserve amounts related to the Akcea Merger that we included in accrued compensation for the period indicated (in millions):

	Year Ended December 31, 2021
Beginning balance as of January 1, 2021	$	14.7
Amount expensed during the year		13.5
Reserve adjustments during the year		(1.8	)
Net amount expensed during the year		11.7
Amounts paid during the year		(26.4	)
Ending balance as of December 31, 2021	$	—