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Related Parties
 6 Months Ended
Jun. 30, 2023
Related Party Transactions [Abstract]  
Related Parties
12.
Related Parties

Following the closing of the F351 Agreement on December 26, 2022, GNI owned 100% of the Catalyst Convertible Preferred Stock as well as 16.6% and 16.5% of Catalyst common stock outstanding as of December 31, 2022 and June 30, 2023, respectively. Overall, GNI owned 80.5% and 80.4% of the outstanding shares of capital stock of the Company, on an as converted basis, as of December 31, 2022 and June 30, 2023, respectively. In addition, Ying Luo and Thomas Eastling became directors of the Company. They serve as a director, representative executive officer, President and Chief Executive Officer, and an outside member, respectively, of GNI Japan, a greater than 5% stockholder of the Company. Dr. Luo also serves as a director of the board and President of GNI USA, Inc. GNI is considered a related party of the Company.

On April 13, 2023, the Company entered into a Cost Sharing and Agency Agreement with GNI. Under the Cost Sharing and Agency agreement, GNI will pay for certain costs related to the development of the F351 Assets in the U.S. incurred from December 26, 2022 until the Business Combination Agreement closes. Following the closing of the Business Combination Agreement, the Company will be required to reimburse GNI for such costs. During the three and six months ended June 30, 2023, the costs incurred for the development of the F351 Assets under the Cost Sharing and Agency Agreement was approximately $0.3 million. The Company paid $0.3 million of development costs related to the F351 Assets during the three months ended June 30, 2023 and GNI has agreed to repay Catalyst for such costs in its next payment cycle. As of June 30, 2023, the Company had amounts receivable from this related party of $0.3 million which was included in prepaid and other current assets on the balance sheet.