Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Basic and diluted net loss per share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

	Year Ended December 31,
	2021		2020		2019
Numerator:
Net loss attributable to common stockholders (in millions)	$	(241.3)	$	(122.3)	$	(108.5)
Denominator:
Weighted average common shares outstanding — basic and diluted	61,224,433		33,654,828		11,124,397
Net loss per share attributable to common stockholders — basic and diluted	$	(3.94)	$	(3.63)	$	(9.75)

Antidilutive potential common shares

The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	December 31,
	2021	2020	2019
Options to purchase common stock	6,573,744	4,944,711	4,048,802
Unvested restricted stock	335,814	—	—
Convertible preferred stock (as converted to common stock)	—	—	31,557,107
	6,909,558	4,944,711	35,605,909