Net Loss Per Share

Basic and diluted net loss per share for the periods set forth below is calculated as follows (in thousands, except share and per share amounts):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Numerator:
Net loss	$	(49,802	)	$	(57,843	)	$	(180,239	)	$	(183,220	)

Denominator:
Weighted-average number of common shares used in loss per share - basic and diluted	45,498,909			43,999,451			45,291,176			43,535,874
Loss per share - basic and diluted	$	(1.09	)	$	(1.31	)	$	(3.98	)	$	(4.21	)

The following potentially dilutive securities, prior to the use of the treasury stock method, have been excluded from the computation of diluted weighted-average shares outstanding, as they would be anti-dilutive. For the three and nine months ended September 30, 2018 and 2017, respectively, all the Company’s options to purchase common stock, warrants, and restricted stock units outstanding were assumed to be anti-dilutive as earnings attributable to common stockholders was in a loss position.



	Three and Nine Months Ended September 30,
	2018	2017
Options to purchase common stock	5,759,140	6,233,398
Warrants	120,532	605,415
Restricted stock units	262,002	108,940

The Company has the option to settle the conversion obligation for the Convertible Notes in cash, shares or any combination of the two. As the Convertible Notes are not convertible as of September 30, 2018, they are not participating securities and they will not have an impact on the calculation of basic earnings or loss per share. Based on the Company's net loss position, there is no impact on the calculation of dilutive loss per share during the three and nine-month periods ended September 30, 2018 and 2017, respectively.