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Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies Business Combination Agreement Concurrent with the F351 Asset acquisition, the Company signed a definitive agreement with GNI and other minority stockholders (“Sellers” and each a “Seller”) to acquire an indirect controlling interest in BC, a commercial-stage pharmaceutical company based in China and majority-owned subsidiary of GNI, in exchange for newly issued shares of Catalyst common stock. The closing of the Business Combination Agreement will be subject to stockholder approval at a stockholder meeting expected to be held in the third quarter of 2023 and certain customary closing conditions. If the transaction is approved by stockholders, the Company would issue at closing a total of up to 1,110,776,224 shares of Catalyst common stock for an indirect controlling interest in BC. Each Seller may elect to be issued Catalyst Convertible Preferred Stock in lieu of the Company’s common stock. The Business Combination Agreement contains certain termination rights, including the right for Catalyst to terminate the Business Combination Agreement to enter into a definitive agreement for a superior proposal. Upon termination of the Business Combination Agreement under specified circumstances, the Company may be required to pay a termination fee of $2.0 million and either party, as the case may be, may be required to reimburse the other party for reasonable out-of-pocket fees and expenses incurred by such party in connection with the Business Combination Agreement, up to a maximum amount of $2.0 million. Contingent Value Rights Agreement Pursuant to the Business Combination Agreement, on December 26, 2022, Catalyst and the Rights Agent (as defined therein) executed a CVR Agreement, pursuant to which the CVR Holders received one contractual CVR issued by the Company, subject to and in accordance with the terms and conditions of the CVR Agreement, for each share of Catalyst common stock held by such holder. Each CVR entitles the holder thereof to receive (i) certain cash payments from the net proceeds related to the disposition of the Company’s legacy assets (MarzAA, DalcA, and CB 2679d-GT), (ii) 100% of the excess cash (net of all current or contingent liabilities, including transaction-related expenses) retained by the Company in excess of $1.0 million as of the closing date of the Business Combination Agreement, (iii) 100% of the amount actually received by the Company pursuant to the Vertex asset purchase agreement and (iv) 100% of the excess, by which the preapproved costs to manage, negotiate, settle and finalize certain third party claims exceed the costs actually incurred with respect to such claims. The CVRs are not transferable, except in certain limited circumstances as provided for in the CVR Agreement, will not be certificated or evidenced by any instrument, and will not be registered with the SEC or listed for trading on any exchange. Manufacturing Agreements The Company previously signed an agreement with AGC Biologics, Inc. (“AGC”) to perform certain manufacturing services related to the Company’s collaboration agreement with Biogen, which included firm work orders totaling $0.7 million. The payment obligations were fully paid off as of March 31, 2022, and Vertex assumed responsibility for further complement-related manufacturing in connection with the sale of the Company’s complement portfolio to Vertex. See Note 16, Restructuring. During the year ended December 31, 2022, the Company terminated its manufacturing agreement with AGC for Catalyst’s remaining programs and has no remaining obligations under the agreement as of December 31, 2022. In July 2021, the Company entered into an agreement for the Company’s screening and natural history of disease clinical studies related to CFI deficiency, with total payments of up to $6.5 million. During the year ended December 31, 2022, the Company terminated this agreement and incurred $0.8 million for clinical trial services incurred prior to termination and reasonable wind-down expenses. As of December 31, 2022, the Company has no remaining obligations under this agreement. On September 16, 2021, the Company signed a Manufacturing and Research and Development Studies Agreement to support the lyophilized drug product, CB 4332. The agreement covers analytical method qualification to support good manufacturing practices (“GMP”) manufacturing. The Company had firm work orders related to this agreement totaling $0.3 million. During the year ended December 31, 2022, the Company terminated this agreement and has no remaining obligations under the agreement as of December 31, 2022. Legal Proceedings On June 15, 2022, certain Company stockholders who beneficially held in the aggregate more than five percent (5%) of the Company’s common stock filed a lawsuit in Delaware Chancery Court, captioned JDS1, LLC v. Catalyst Biosciences, Inc., alleging that the Company violated Section 271 of the Delaware General Corporation Law and breach of fiduciary duty in connection with the Company’s asset sale to Vertex, as well as certain claims related to the alleged failure to disclose information related to the Vertex transaction. In August 2022, the lawsuit was dismissed with prejudice and the Company reimbursed JDS1, LLC for its legal and other expenses related to the litigation in the amount of $0.4 million. COVID-19 The current COVID-19 pandemic has presented a substantial public health and economic challenge around the world and is affecting the Company’s employees and business operations. The full extent to which the COVID-19 pandemic will directly or indirectly impact the Company’s business, results of operations and financial condition will depend on future developments that are highly uncertain and cannot be accurately predicted, including new information that may emerge concerning COVID-19, the actions taken to contain it or treat its impact and the economic impact on local, regional, national, and international markets. The COVID-19 pandemic may disrupt the Company’s ability to out-license any of its remaining assets.

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- Definition

The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-URI https://asc.fasb.org/topic&trid=2144648

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