10. Net Loss per Share

Basic and diluted net loss per share was calculated as follows (in thousands, except share and per share amounts):


	Three Months Ended March 31,
	2020		2019
Numerator:
Net loss	$	(48,486)	$	(32,581)

Denominator:
Weighted average common shares outstanding, basic and diluted		80,271,848		77,544,089
Net loss per share, basic and diluted	$	(0.60)	$	(0.42)

The Company’s potential dilutive securities 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 from the periods in the table above, 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:


	March 31,
	2020	2019
Convertible preferred stock (as converted to common stock)	—	—
Warrants to purchase convertible preferred stock (as converted to common stock)	—	—
Unvested restricted common stock	299,700	1,816,047
Stock options to purchase common stock	16,949,462	15,826,888
	17,249,162	17,642,935