Net Loss per Share Attributable to Common Stockholders

6 Months Ended

Jun. 30, 2021

Net Loss per Share Attributable to Common Stockholders

13. Net loss per share attributable to common stockholders

As noted above, for periods in which the Company reports a net loss attributable to common stockholders, potentially dilutive securities have been excluded from the computation of diluted net loss per share as their effects would be anti-dilutive. 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 period end, from the computation of diluted net loss per share attributable to common stockholders because including them would have had an anti-dilutive effect:


	As of June 30,
	2021		2020
Unvested restricted stock		1,290,661		1,880,070
Outstanding options to purchase common stock		5,934,744		5,646,046
Total		7,225,405		7,526,116

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):


	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Numerator:
Net loss attributable to common stockholders	$	(76,253	)	$	(34,218	)	$	(277,813	)	$	(65,953	)
Denominator:
Weighted average number of common shares, basic and diluted		62,210,239			49,430,138			61,215,705			40,077,788
Net loss per common share attributable to common stockholders, basic and diluted	$	(1.23	)	$	(0.69	)	$	(4.54	)	$	(1.65	)