10. Net loss per share

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


	Three Months Ended March 31,
	2020		2019
Numerator:
Net loss	$	(11,886)	$	(5,362)
Denominator:
Weighted average common shares outstanding, basic and diluted		28,499,475		168,071
Net loss per share, basic and diluted	$	(0.42)	$	(31.90)

The Company excluded 77,223 shares and 70,915 shares of restricted common stock, presented on a weighted average basis, from the calculations of basic net loss per share for the three months ended March 31, 2020 and 2019, respectively, because those shares had not vested.

The Company’s potentially dilutive securities, which include stock options, unvested restricted common stock and redeemable convertible preferred 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:


	Three Months Ended March 31,
	2020	2019
Options to purchase common stock	3,095,450	2,314,740
Unvested restricted common stock	93,532	66,042
Redeemable convertible preferred stock (as converted to common stock)	—	21,056,136
	3,188,982	23,436,918