Net Loss Per Share

6 Months Ended

Jun. 30, 2020

Basic net loss per share is calculated by dividing net loss by the weighted average number of shares outstanding for the period. Diluted net loss per share is calculated by dividing net loss by the weighted average number of shares of common stock and potential dilutive common stock equivalents outstanding during the period if the effect is dilutive. Our potentially dilutive shares of common stock include outstanding stock options, restricted stock units and warrants to purchase common stock.

A reconciliation of the numerators and denominators used in computing net loss per share is as follows (in thousands, except per share amounts):


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net loss	$	(53,324)	$	(37,763)	$	(79,124)	$	(72,965)

Denominator:
Shares used in per share calculation	55,355		42,458		51,770		42,348

Net loss per share, basic and diluted	$	(0.96)	$	(0.89)	$	(1.53)	$	(1.72)

The following table presents the potential shares of common stock outstanding that were excluded from the calculation of diluted net loss per share for the periods presented because including them would have been anti-dilutive (in thousands):


	Three Months Ended June 30,			Six Months Ended June 30,
	2020	2019	2020	2019
Shares subject to outstanding stock options	4,942	4,227	4,696	3,973
Shares subject to outstanding restricted stock units	555	415	520	355
Shares subject to outstanding warrants to purchase common stock	28	28	28	28
Total	5,525	4,670	5,244	4,356