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Loss per Common Share | 6 Months Ended
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Jun. 30, 2019
Loss per Common Share |
Loss per Common Share | 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.
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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