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Net Loss Per Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Net Loss Per Share |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share due to their anti-dilutive effect: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
​ |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
Stock options to purchase common stock |  | 3,560,541 |  | 2,399,195 | ​ | 3,560,541 | ​ | 2,399,195
Unvested restricted stock units |  | — |  | 425,799 | ​ | — | ​ | 425,799
Convertible promissory notes |  | — |  | 2,133,019 | ​ | — | ​ | 2,133,019
Total |  | 3,560,541 |  | 4,958,013 | ​ | 3,560,541 | ​ | 4,958,013

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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 + Details
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