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Convertible Preferred Stock and Common Stock Warrants - February Offerings (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2024 USD ($) | Feb. 25, 2024 USD ($) $ / shares shares | Feb. 17, 2023 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Dec. 31, 2023 $ / shares shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  | 9,099,539 |  | 9,099,539 |  | 8,797,456
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Proceeds from issuance of preferred stock |  |  |  |  |  | $ 8,856 | $ 29,793 |
Warrants exercised | shares |  |  |  |  |  | 0 |  |
Net proceeds from issuance of preferred stock and warrants | $ 9,250 |  |  |  |  |  |  |
Preferred stock issuance costs |  | $ 102 |  |  |  |  |  |
General and administrative |  |  |  | $ 6,290 | $ 6,124 | $ 12,340 | $ 14,990 |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  | 30,000 | 27,200 |  | 27,200 |  | 28,628
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Common stock, shares issued (in shares) | shares |  |  | 7,871,712 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |
Proceeds from issuance of preferred stock |  |  | $ 30,000 |  |  |  |  |
Convertible preferred stock, conversion ratio |  |  | 145.7726 |  |  |  |  |
Liquidation preference |  |  | $ 1 |  |  |  |  |
Number of securities called by each warrant (in shares) | shares |  |  | 1 |  |  |  |  |
Exercise price of warrant (in dollars per share) | $ / shares |  |  | $ 4.66 |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  | 0 |  |
Aggregate estimated fair value of warrants |  |  | $ 26,133 |  |  |  |  |
Net proceeds from issuance of preferred stock and warrants |  |  | 3,867 |  |  |  |  |
Accrued stock issuance costs |  |  | 1,963 |  |  |  |  |
Preferred stock issuance costs |  |  | 253 |  |  |  |  |
General and administrative |  |  | $ 1,710 |  |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  | 9,250 |  | 9,250 |  | 9,250 |  | 0
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Common stock, shares issued (in shares) | shares |  | 1,799,021 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ 9,250 |  |  |  |  |  |  |
Convertible preferred stock, conversion ratio |  | 129.6596 |  |  |  |  |  |
Liquidation preference |  | $ 1 |  |  |  |  |  |
Number of securities called by each warrant (in shares) | shares |  | 1 |  |  |  |  |  |
Exercise price of warrant (in dollars per share) | $ / shares |  | $ 7.7125 |  |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  | 0 |  |
Aggregate estimated fair value of warrants |  | $ 6,856 |  |  |  |  |  |
Net proceeds from issuance of preferred stock and warrants |  | 2,394 |  |  |  |  |  |
Accrued stock issuance costs |  | 394 |  |  |  |  |  |
General and administrative |  | $ 292 |  |  |  |  |  |

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- Definition The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References No definition available. + Details
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