NET LOSS PER SHARE

12 Months Ended

Dec. 31, 2021

Net loss per share

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company (in thousands, except share and per share amounts):


	December 31,
	2021		2020
Net loss attributable to common stockholders	$	(125,596)	$	(67,254)
Weighted average common shares outstanding, basic and diluted	36,189,002		32,907,100
Net loss per share, basic and diluted	$	(3.47)	$	(2.05)

The Company’s unvested restricted common shares at December 31, 2021 and 2020 have been excluded from the computation of basic net loss per share attributable to common stockholders.

The Company’s potentially dilutive securities, which include options, unvested restricted stock, shares issuable under the employee stock purchase plan and warrants to purchase 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 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 for the periods indicated because including them would have had an anti-dilutive effect:


	December 31,
	2021	2020
Options to purchase common stock	4,903,839	3,752,744
Unvested restricted stock	30,667	54,336
Shares issuable under employee stock purchase plan	24,806	—
Warrants to purchase shares of common stock	10,757	10,757
	4,970,069	3,817,837