LOSS PER COMMON SHARE

9 Months Ended

Sep. 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 September 30,				Nine months ended September 30,
		2017		2016		2017		2016
Loss attributable to common shareholders — basic and diluted	$	(13,263)	$	(26,444)	$	(57,462)	$	(66,617)
Weighted-average number of common shares used in net loss per share - basic and diluted		29,753,043		23,460,340		29,517,396		23,334,558
Loss per share - basic and diluted	$	(0.45)	$	(1.13)	$	(1.95)	$	(2.85)

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 September 30,		Nine months ended September 30,
	2017	2016	2017	2016
Outstanding stock options	3,056,954	2,258,775	3,056,954	2,258,775
Warrants	2,445	2,445	2,445	2,445
Unvested restricted stock(1)	44,586	95,159	44,586	95,159
Restricted stock units	218,872	41,739	218,872	41,739
(1) - Includes shares of unvested restricted stock remaining from the early exercise of stock options.