LOSS PER COMMON SHARE

6 Months Ended

Jun. 30, 2017

LOSS PER COMMON SHARE

LOSS PER COMMON SHARE

3. Loss per Common Share

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

	Three months ended June 30,				Six months ended June 30,
		2017		2016		2017		2016
Loss attributable to common shareholders — basic and diluted	$	(21,121)	$	(24,520)	$	(44,199)	$	(40,172)
Weighted-average number of common shares used in net loss per share - basic and diluted		29,441,514		23,417,378		29,396,143		23,273,765
Loss per share - basic and diluted	$	(0.72)	$	(1.05)	$	(1.50)	$	(1.73)

The following potentially dilutive securities, which represent all outstanding potentially dilutive securities, were excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in common stock equivalent shares):

	Three months ended June 30,		Six months ended June 30,
	2017	2016	2017	2016
Outstanding stock options	3,124,039	2,290,112	3,124,039	2,290,112
Warrants	2,445	2,445	2,445	2,445
Unvested restricted stock(1)	57,228	107,801	57,228	107,801
Restricted stock units	223,194	41,739	223,194	41,739
(1) - Includes shares of unvested restricted stock remaining from the early exercise of stock options.