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Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2020
Common Stock |
Schedule of shares of common stock reserved for issuance | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 |
Exchange warrants |  | 1,458,000 | ​ | 1,458,000 |
Shares available for future option grants | ​ | 2,822,995 | ​ | 1,704,183 | ​
Outstanding options |  | 5,561,098 | ​ | 5,643,410 |
Shares reserved for employee stock purchase plan |  | 400,000 | ​ | 400,000 |
Total |  | 10,242,093 | ​ | 9,205,593 |

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