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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2022
Stockholders' Equity |
Stockholders' Equity | 8. Stockholders’ Equity Preferred Stock Under the Company’s Restated Certificate of Incorporation, the Company has 5,000,000 shares of preferred stock authorized for issuance, with a $0.001 par value per share. Preferred stock may be issued from time to time in one or more series, each series to have such terms as stated or expressed in the resolutions providing for the issue of such series adopted by the Board of Directors of the Company. Preferred stock which may be redeemed, purchased or acquired by the Company may be reissued except as otherwise provided by law. As of March 31, 2022, the Company had 31,455 shares of Series X Preferred Stock outstanding. Each share of Series X Preferred Stock is convertible into 166.67 shares of common stock and therefore the number of shares of underlying common stock issuable upon conversion of the Series X Preferred Stock is 5,242,501. Refer to Note 1 , “Organization and Operations” regarding the Company’s issuance of Series X Preferred Stock in January 2021 and February 2021. Outstanding Warrants The following table presents information about warrants that are issued and outstanding at March 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Issued |  | Equity Instrument |  | Warrants Outstanding |  | Exercise Price |  | Date of Expiration
2018 |  | Common Stock | ​ | 699,962 | ​ | $ | 72.00 |  | 6/21/2023
2019 |  | Common Stock | ​ | 331,858 | ​ | $ | 37.50 |  | 2/7/2024
2021 | ​ | Common Stock | ​ | 498,356 | ​ | $ | 2.10 | ​ | 12/14/2030
Total |  | ​ | ​ | 1,530,176 | ​ |  | ​ |  | ​
Weighted average exercise price | ​ | ​ | ​ | ​ | ​ | $ | 41.75 |  | ​
Weighted average life in years | ​ | ​ | ​ | ​ | ​ |  |  |  | 3.80
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