5. 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. The Company computed net loss per share of common stock using the treasury stock method for the three months ended March 31, 2018 and 2017. 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 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
	March 31,
	2018		2017(*)
Numerator:
Net loss attributable to common stockholders, basic and diluted	$	(18,094)	$	(2,593)
Denominator (basic and diluted):
Weighted average shares of common stock outstanding, basic and diluted		18,789,226		16,238,761
Net loss per share attributable to common stockholders, basic and diluted	$	(0.96)	$	(0.16)

*As adjusted. See Note 3.

The following potential common shares, presented based on amounts outstanding at each period end, 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:


	Three Months Ended
	March 31,
	2018	2017
Stock options to purchase common stock	2,809,641	3,219,862
Restricted stock	1,144,709	727,858
Common stock warrants	—	32,216
	3,954,350	3,979,936