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Reserved for Future Issuance | 9 Months Ended
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Sep. 30, 2021
Reserved for Future Issuance |
Reserved for Future Issuance | 8. Reserved for Future Issuance The Company has reserved for future issuance the following shares of common stock: ​
​ | ​ | ​ | ​ | ​
​ |  | September 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Series X Preferred Stock | ​ | 5,242,501 | ​ | —
Warrants for the purchase of common stock |  | 1,530,380 |  | 1,032,291
Options outstanding to purchase common stock |  | 1,334,399 |  | 227,846
Options available for future issuance to purchase common stock | ​ | 254,748 | ​ | 322,695
​ | ​ | ​ | ​ | ​
Shares reserved for the employee stock purchase plan |  | 30,904 | ​ | 24,825
Total |  | 8,392,932 |  | 1,607,657
​ As of September 30, 2021, the Company also had 31,455 shares of Series X Preferred Stock outstanding. Each share of Series X Preferred Stock outstanding is convertible into 166.67 shares of the Company’s common stock, subject to certain beneficial ownership limitations at the holder’s option. See Note 1 – “Organization and Operations” for additional detail.

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