NET LOSS PER COMMON SHARE

12 Months Ended

Dec. 31, 2017

NET LOSS PER COMMON SHARE

NET LOSS PER COMMON SHARE

3. NET LOSS PER COMMON SHARE

For the years ended December 31, 2017,  2016 and 2015, the securities discussed below were anti‑dilutive due to the net losses in those periods and, therefore, the number of shares used to compute basic and diluted earnings per share are the same for of those periods.

The following table presents the computations of basic and dilutive net loss per share:

	Years ended December 31,
		2017		2016		2015
Net loss	$	(74,865)	$	(94,176)	$	(27,255)
Extinguishment of preferred stock - see Note 11		—		—		31,806
Accretion and dividends of prior preferred stock - See Note 11		—		—		(23,327)
Accretion and dividends of Series D preferred stock		—		—		(1,245)
Loss attributable to common shareholders — basic and diluted	$	(74,865)	$	(94,176)	$	(20,021)
Weighted-average number of common shares used in net loss per share - basic and diluted		30,265,262		24,262,945		13,542,282
Loss per share - basic and diluted	$	(2.47)	$	(3.88)	$	(1.48)

The following potentially dilutive securities outstanding have been excluded from the computations of diluted weighted‑average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares):

	Years ended December 31,
	2017	2016	2015
Outstanding stock options	3,037,690	2,326,801	1,452,149
Warrants	2,445	2,445	2,445
Unvested restricted stock(1)	31,943	82,512	75,718
Restricted stock units	218,872	41,741	—
(1) - Includes shares of unvested restricted stock remaining from the early exercise of stock options.