Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2022

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:

	Three Months Ended March 31,
	2022		2021
Numerator:
Net loss attributable to common stockholders ($ in millions)	$	(74.8)	$	(49.0)
Denominator:
Weighted average common shares outstanding — basic and diluted	61,698,568		60,218,652
Net loss per share attributable to common stockholders — basic and diluted	$	(1.21)	$	(0.81)

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.

	Three Months Ended March 31,
	2022	2021
Options to purchase common stock	6,355,274	4,841,616
Unvested restricted stock	475,749	50,250
	6,831,023	4,891,866