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Net Loss per Share

12 Months Ended

Dec. 31, 2018

(15)	Net Loss per Share

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

	2018			2017
Numerator:
Net loss attributable to common stockholders	$	(48,435	)	$	(40,377	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		23,882,685			6,724,641
Net loss per share attributable to common stockholders - basic and diluted	$	(2.03	)	$	(6.00	)

The Company’s potentially dilutive shares, which include outstanding stock options and unvested restricted common stock, are considered to be common share equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive.

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the calculation of the diluted net loss per share attributable to common stockholders for the period indicated because including them would have had an anti-dilutive effect.

	As of December 31,
	2018		2017
Unvested restricted common stock awards		118,679		375,479
Outstanding options to purchase common stock		1,739,884		1,267,221