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Net Loss per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Net Loss per Common Share |
Schedule of Basic and Diluted Net Loss Per Share | The following potentially dilutive securities have not been included in the computation of diluted net loss per share for the three months ended September 30, 2020 and 2021, as the result would be anti-dilutive:
​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | September 30,
​ |  | 2020 |  | 2021
Stock options |  | 154,594 |  | 720,788
6% convertible exchangeable preferred stock |  | 85 |  | 85
Series A preferred stock |  | 6,600 |  | 6,600
Series B preferred stock |  | — |  | 1,188,725
Common stock warrants |  | 4,370,525 |  | 3,234,379
Total shares excluded from calculation |  | 4,531,804 |  | 5,150,577

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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