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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2024
Equity [Abstract] |
Stockholders' Equity | 9. Stockholders’ Equity Series B Convertible Preferred Stock Dividend Accretion The following table summarizes Series B convertible preferred stock and the accretion of dividend activity for the three months ended March 31, 2024 and 2023 (in thousands):
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
Series B Convertible Preferred Stock: |  |  |  |  |  |
Balance at beginning of period |  | $ | 26,589 |  |  | $ | 25,323 |
Cumulative dividends on Series B convertible preferred stock |  |  | 248 |  |  |  | 313 |
Balance at end of period |  | $ | 26,837 |  |  | $ | 25,636 |
Number of Common Shares Issuable Upon Conversion: |  |  |  |  |  |
Number of shares at beginning of period |  |  | 6,647 |  |  |  | 6,331 |
Cumulative dividends on Series B convertible preferred stock |  |  | 62 |  |  |  | 78 |
Number of shares at end of period |  |  | 6,709 |  |  |  | 6,409 |
Based on the current conversion price, the outstanding shares, including the accretion of dividends, of Series B convertible preferred stock as of March 31, 2024 would be convertible into 6,709,359 shares of the Company’s common stock. However, the conversion rate will be subject to adjustment in certain instances, such as if the Company issues shares of its common stock at a price less than $4.00 per common share, subject to a minimum conversion price of $3.27 per share. As of March 31, 2024, none of the contingent conditions to adjust the conversion rate had been met. Each share of Series B convertible preferred stock is entitled to a cumulative annual dividend of 5% for the first six years following the issuance of such share and 3% for each year thereafter, with the Company retaining the option to settle each year’s dividend after the 10th year in cash. The dividends accrue and are payable in kind upon such time as the shares convert into the Company’s common stock. In general, the shares are not entitled to vote except in certain limited cases, including in change of control transactions where the expected price per share distributable to the Company’s stockholders is expected to be less than $4.00 per share. The Certificate of Designation with respect to the Series B convertible preferred stock further provides that in the event of, among other things, any change of control, liquidation or dissolution of the Company, the holders of the Series B convertible preferred stock will be entitled to receive, on a pari passu basis with the holders of the common stock, the same amount and form of consideration that the holders of the Company’s common stock receive (on an as-if-converted-to-common-stock basis and without regard to the Beneficial Ownership Limitation (as defined in the Certificate of Designation) applicable to the Series B convertible preferred stock). Common Stock Reserved for Future Issuance Common stock reserved for future issuance as of March 31, 2024 was as follows:
Exercise of outstanding stock options, vesting of restricted stock units ("RSUs"), and issuance of RSUs vested but not released |  |  | 1,304,248 |
Employee Stock Purchase Plan |  |  | 293,888 |
Shares of common stock available for grant under the 2011 Plan |  |  | 286,899 |
Shares of common stock issuable upon conversion of Series B convertible preferred stock |  |  | 7,541,449 |
Total |  |  | 9,426,484 |

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