Earnings per share

Basic earnings per share is computed by dividing net loss available to common stockholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed by dividing net loss available to common stockholders by the weighted-average number of common shares plus the effect of dilutive potential common shares outstanding during the period.

The following table sets forth the computation of basic and diluted earnings per share for common stockholders:



	Year ended December 31,
	2017				2016				2015
Numerator
Net loss	$	(79,000	)		$	(142,110	)		$	(170,447	)
Denominator
Denominator for basic and diluted net loss per share	39,183,073				34,044,584				33,626,248
Net loss per share:
Basic and diluted	$	(2.02	)	*	$	(4.17	)	*	$	(5.07	)	*

* For the years ended December 31, 2017, 2016, and 2015, the Company experienced a net loss and therefore did not report any dilutive share impact.

The following table shows historical dilutive common share equivalents outstanding, which are not included in the above historical calculation, as the effect of their inclusion is anti-dilutive during each period.



	As of December 31,
	2017	2016	2015
Stock Options	6,448,642	5,854,316	4,826,477
Unvested restricted stock	393,011	271,651	344,335
Total	6,841,653	6,125,967	5,170,812