1. Organization and Basis of Presentation Conatus Pharmaceuticals Inc. (the Company) was incorporated in the state of Delaware on July 13, 2005. The Company is a biotechnology company that has been focused on the development and commercialization of novel medicines to treat chronic diseases with significant unmet need. In December 2016, the Company entered into an Option, Collaboration and License Agreement (the Collaboration Agreement) with Novartis Pharma AG (Novartis) for the development and commercialization of emricasan, an orally active pan-caspase inhibitor, for the treatment of patients with chronic liver disease. In March 2019, the Company announced that top-line results from the ENCORE-NF clinical trial of emricasan did not meet the primary endpoint. In June 2019, the Company announced that top-line results from its ENCORE-LF clinical trial of emricasan also did not meet the primary endpoint. In addition, results from the 24-week extension in the Companys ENCORE-PH clinical trial of emricasan were consistent with results from the initial 24-week treatment period and did not meet predefined objectives. Consequently, the Company and Novartis have no further development plans for emricasan, and the Company and Novartis entered into an amendment to the Collaboration Agreement, pursuant to which the Company and Novartis mutually agreed to terminate the Collaboration Agreement, effective September 30, 2019. In order to extend the Companys resources, the Company commenced a restructuring plan in June 2019 that included reducing staff and suspending development of its inflammasome disease candidate, CTS-2090, and commenced a second restructuring plan in September 2019 that included reducing additional staff to further extend the Companys resources. The Company engaged a financial advisor to assist in the exploration and evaluation of strategic alternatives to enhance shareholder value, including a merger, an acquisition or sale of assets or a dissolution and liquidation of the Company. On January 28, 2020, Conatus, Chinook Merger Sub, Inc. (Merger Sub), and Histogen Inc. (Histogen) entered into the Agreement and Plan of Merger and Reorganization (Merger Agreement), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into Histogen, with Histogen continuing as Conatus wholly owned subsidiary and the surviving corporation of the merger. See Note 14  Subsequent Events for additional information. As of December 31, 2019, the Company has devoted substantially all of its efforts to product development and has not realized product sales revenues from its planned principal operations. The Company has a limited operating history, and the sales and income potential of the Companys business and market are unproven. The Company has experienced net losses since its inception and, as of December 31, 2019, had an accumulated deficit of $198.0 million. The Company expects to continue to incur net losses for at least the next several years. Successful transition to attaining profitable operations is dependent upon achieving a level of revenues adequate to support the Companys cost structure. As of December 31, 2019, the Company had cash and cash equivalents of $20.7 million and working capital of $20.0 million. Based on the Companys current business plan, management believes that its existing cash and cash equivalents will be sufficient to fund the Companys obligations for at least twelve months from the issuance date of these financial statements. If the Company is unable to generate revenues adequate to support its cost structure, the Company may need to raise additional equity or debt financing or seek to complete one of the strategic alternatives described above. Reverse Stock Split On May 26, 2020, in connection with, and prior to the completion of, the Merger with Histogen discussed above, the Company effected a reverse stock split of the Companys common stock at a ratio of one-for-ten (the Reverse Stock Split). The par value and the authorized shares of the common stock were not adjusted as a result of the Reverse Stock Split. All issued and outstanding common stock have been retroactively adjusted to reflect this Reverse Stock Split for all periods presented.