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 March 31,
	2019			2018
Numerator:
Net loss	$	(42,760	)	$	(61,555	)

Denominator:
Weighted-average number of common shares used in loss per share - basic and diluted	45,671,502			44,937,776
Loss per share - basic and diluted	$	(0.94	)	$	(1.37	)

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 months ended March 31, 2019 and 2018, 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 Months Ended March 31,
	2019	2018
Options to purchase common stock	5,773,654	5,886,348
Warrants	—	425,283
Restricted stock units	557,150	336,240
Performance units	79,000	—

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 March 31, 2019, 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-month periods ended March 31, 2019 and 2018, respectively.