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Common Stock (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Common Stock |  |
Summary of shares reserved for shares authorized but unissued common stock | The Company has reserved shares of common stock for issuance as follows (in thousands):
​ | ​ | ​ | ​ | ​
​ |  | March 31 |  | December 31
​ | ​ | 2024 | ​ | 2023
Warrants | ​ | 26,724 | ​ | 2,894
Shares available for future grant from 2024 plan | ​ | 3,983 | ​ | —
Convertible promissory notes |  | 800 |  | 1,835
Options issued and outstanding |  | 668 |  | 668
Shares available for future grant from 2024 ESPP |  | 600 |  | —
RSUs outstanding |  | 392 |  | 392
Shares available for future grant from 2011 plan |  | — |  | 113
Total |  | 33,167 |  | 5,902
​ | The Company has reserved the following shares of authorized but unissued common stock as of December 31, 2023
​ | ​ | ​
Options outstanding |  | 3,579,294
RSUs outstanding |  | 2,099,970
Shares available for grant from 2011 plan |  | 605,826
Warrants |  | 9,200,000
Convertible promissory notes |  | 9,827,666
Total |  | 25,312,756
​

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