Net Loss per Share

12 Months Ended

Dec. 31, 2022

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


	Year Ended December 31,
	2022		2021		2020
Numerator:
Net loss attributable to common stockholders (in millions)	$	(297.8)	$	(241.3)	$	(122.3)
Denominator:
Weighted average common shares outstanding — basic and diluted	64,921,524		61,224,433		33,654,828
Net loss per share attributable to common stockholders — basic and diluted	$	(4.59)	$	(3.94)	$	(3.63)

The Company's potentially dilutive securities, which include stock options and warrants to purchase shares of common stock, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. 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,
	2022	2021	2020
Options to purchase common stock	9,760,657	6,573,744	4,944,711
Unvested restricted stock	1,651,243	335,814	—
Warrants for common stock (1)	412,969	—	—
	11,824,869	6,909,558	4,944,711

(1) Each outstanding warrant of Metromile assumed by the Company are converted automatically into warrants denominated in the Company’s common stock with the number of warrants and exercise price adjusted based on the exchange ratio of 0.05263