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GNI USA Contributions under the Business Combination Agreement - Summary of Purchase Price (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
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Business Acquisition [Line Items] |  |  |  |
Catalyst common stock outstanding |  |  | 76,595,616 | 63,588,119
Catalyst |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Catalyst common stock outstanding |  | 2,532 |  |
Multiplied by the fair value per share of Catalyst stock | [1] | $ 7.67 |  |
Fair value of common shares to be owned by Catalyst's stockholders |  | $ 19,420 |  |
Fair value of preferred shares to be owned by Catalyst's stockholders | [2] | 63,099 |  |
Fair value of Catalyst |  | 82,519 |  |
Pre-GNI USA Contributions Catalyst stock options assumed by CPI | [3] | 1,829 |  |
Fair value of consideration issued |  | 84,348 |  |
Acquisition costs |  | 659 |  |
Total Purchase price |  | $ 85,007 |  |
[1] | The purchase price was based on the closing price of Catalyst Common Stock on October 30, 2023.
[2] | This amount is calculated based on 12,340 shares of Convertible Preferred Stock outstanding as of October 30, 2023. Each share of preferred stock converts into approximately 666.67 shares of common stock. The fair value was calculated using the closing price of Catalyst Common Stock on October 30, 2023 and the number of underlying common shares.
[3] | Any option to purchase Catalyst Common Stock that was issued and outstanding at the Effective Time remains issued and outstanding and unaffected by the GNI USA Contributions. In a reverse acquisition, however, from an accounting perspective, the Catalyst employee stock option awards have been exchanged for share-based payment awards of the accounting acquirer. Accordingly, this balance represents the pre-Contributions service portion of the estimated fair value of the employee stock option awards issued to Catalyst option holders. In calculating the estimated fair value of the option awards based on the Black-Scholes model, management used the following weighted-average assumptions:

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