Net Loss Per Share

12 Months Ended

Dec. 31, 2016

14. Net Loss Per Share

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

	Years ended December 31,
	2015			2016
Numerator:
Basic and diluted net loss per common share		$	(14,543)		$	(11,991)
Denominator:
Weighted-average number of common shares used in loss per share – basic and diluted			2,713,096			3,424,976
Loss per share – basic and diluted		$	(5.36)		$	(3.50)

The Company’s potential dilutive securities, which include stock options and warrants to purchase common 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 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:

	Year ended December 31,
	2015		2016
Stock options		206,298		389,378
Convertible preferred stock		1,698		1,698
Common stock warrants		45,343		—
Total shares excluded from calculation		253,340		391,076