Net Loss Per Share

Basic loss per common share is determined by dividing loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted loss per share is computed by dividing the loss attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. The treasury stock method is used to determine the dilutive effect of the Company's stock option grants. 5,367,754 stock options (common stock equivalents) were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2018 because their inclusion would have been anti-dilutive. 4,621,008 stock options were excluded from the calculation of diluted loss per share for the three and six months ended June 30, 2017 because their inclusion would have been anti-dilutive.

Basic and diluted loss per common share is computed as follows (in thousands except share and per share data):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net loss used for calculation of basic and diluted EPS	$	(43,244	)	$	(40,654	)	$	(92,780	)	$	(78,310	)

Denominator:
Weighted average shares outstanding, basic	42,153,813			35,784,804			39,559,599			35,373,799
Effect of dilutive securities:
Stock options and restricted stock units	—			—			—			—
Weighted average shares outstanding, diluted	42,153,813			35,784,804			39,559,599			35,373,799

Net loss per share, basic and diluted	$	(1.03	)	$	(1.14	)	$	(2.35	)	$	(2.21	)