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Loss per Common Share (Tables)

6 Months Ended

Jun. 30, 2019

Loss per Common Share

Schedule of computations of basic and diluted net loss per share

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​	​	​	​	​	​	​	​	​	​	​	​
​	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)

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

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​	​	​	​	​	​	​	​
​	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.

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- References

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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