Loss per Common Share (Tables)

9 Months Ended

Sep. 30, 2019

Loss per Common Share

Schedule of computations of basic and diluted net loss per share

	Three months ended September 30,				Nine months ended September 30,
		2019		2018		2019		2018
Net loss	$	(6,109)	$	(16,502)	$	(20,521)	$	(48,214)
Weighted-average number of common shares used in net loss per share - basic and diluted		33,481,923		33,012,174		33,360,272		32,950,584
Loss per share - basic and diluted	$	(0.18)	$	(0.50)	$	(0.62)	$	(1.46)

Schedule of potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding

	Three months ended September 30,		Nine months ended September 30,
	2019	2018	2019	2018
Outstanding stock options	4,140,629	3,693,400	4,140,629	3,693,400
Warrants	1,041,667	—	1,041,667	—
Unvested restricted stock (1)	—	7,545	—	7,545
Restricted stock units	868,075	532,787	868,075	532,787
Performance share units	99,400	—	99,400
(1) - Includes shares of unvested restricted stock remaining from the early exercise of stock options.