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Loss per Common Share

6 Months Ended

Jun. 30, 2019

5. 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,
		2019		2018		2019		2018
Loss attributable to common shareholders — basic and diluted	$	(4,712)	$	(13,060)	$	(14,412)	$	(31,712)
Weighted-average number of common shares used in net loss per share - basic and diluted		33,397,709		32,967,718		33,338,243		32,935,873
Loss per share - basic and diluted	$	(0.14)	$	(0.40)	$	(0.43)	$	(0.96)

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,
	2019	2018	2019	2018
Outstanding stock options	4,190,116	3,665,459	4,190,116	3,665,459
Warrants	1,041,667	—	1,041,667	—
Unvested restricted stock (1)	—	12,072	—	12,072
Restricted stock units	892,237	522,190	892,237	522,190
Performance share units	99,400	—	99,400

(1) - Includes shares of unvested restricted stock remaining from the early exercise of stock options.