Net Loss Per Share

Basic net loss from continuing operations per share is calculated by dividing net loss from continuing operations by the weighted average number of shares outstanding for the period. Diluted net loss from continuing operations per share is calculated by dividing net loss from continuing operations 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. The Company’s 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 from continuing operations per share is as follows (in thousands, except per share amounts):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net loss from continuing operations	$	(28,839	)	$	(22,453	)	$	(59,019	)	$	(43,579	)

Denominator:
Shares used in per share calculation	35,355			24,822			35,099			24,817

Net loss from continuing operations per share, basic and diluted	$	(0.82	)	$	(0.90	)	$	(1.68	)	$	(1.76	)

The following table presents the potential shares of common stock outstanding that were excluded from the computation of diluted net loss from continuing operations 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,
	2018	2017	2018	2017
Shares subject to outstanding common stock options	3,816	4,020	3,648	3,756
Shares subject to outstanding restricted stock units	292	273	279	205
Shares subject to outstanding warrants to purchase common stock	38	1,975	38	1,975
Total	4,146	6,268	3,965	5,936