Net Loss per Share

6 Months Ended

Jun. 30, 2019

Net Loss per Share

Net Loss per Share

4.     Net Loss per Share

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock of the Company outstanding during the period. Diluted net loss per share is computed by dividing net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period plus the impact of dilutive securities, to the extent that they are not anti-dilutive.

The following table presents the calculation of basic and diluted net loss per share for the Company’s common stock:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Numerator (basic and diluted):
Net loss	$	(6,529)	$	(29,026)	$	(17,508)	$	(47,120)
Denominator (basic and diluted):
Weighted average shares of common stock outstanding, basic and diluted		20,482,032		18,956,445		20,433,564		18,873,297
Net loss per share, basic and diluted	$	(0.32)	$	(1.53)	$	(0.86)	$	(2.50)

The following potential common shares, presented based on amounts outstanding for the three and six months ended June 30, 2019 and 2018 were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect.

	June 30,
	2019	2018
Stock options to purchase common stock	2,948,279	2,602,641
Unvested restricted stock	1,445,817	1,061,879
Common stock warrants	4,646,393	—
Contingently issuable shares	5,000	154,150
	9,045,489	3,818,670

Shares of common stock associated with the potential conversion of the Company’s convertible senior subordinated notes have been excluded in the table above.