11. Net Loss per Share

The Company has two classes of common stock. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. As a result, basic and diluted net income (loss) per share of Class A common stock and share of Class B common stock are equivalent. Basic and diluted net loss per share attributable to common stockholders was calculated as follows (in thousands, except share and per share amounts):


	Year Ended December 31,
	2018			2017
Numerator:
Net loss	$	(13,791	)	$	(5,071	)
Accretion of redeemable convertible preferred stock to redemption value		(37,415	)		(14,093	)

Net loss attributable to common stockholders	$	(51,206	)	$	(19,164	)

Denominator:
Weighted average common shares outstanding, basic and diluted		16,922,225			8,773,880

Net loss per share attributable to common stockholders, basic and diluted	$	(3.03	)	$	(2.18	)

The Company’s potentially 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 attributable to common stockholders. 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,
	2018		2017
Redeemable convertible preferred stock (as converted to common stock)		—		12,596,064
Options to purchase common stock		3,770,086		3,535,560
Unvested restricted stock units		2,409,893		242,496

		6,179,979		16,374,120