Nature of Business and Basis of Presentation	6 Months Ended
Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	1. Nature of Business and Basis of Presentation Compass Therapeutics, Inc. (“Compass” or the “Company”) is a clinical-stage, oncology-focused biopharmaceutical company developing proprietary antibody-based therapeutics to treat multiple human diseases. Our scientific focus is on the relationship between angiogenesis and the immune system. Our pipeline includes novel product candidates that leverage our understanding of the tumor microenvironment, including both angiogenesis-targeted agents and immune-oncology focused agents. These product candidates are designed to optimize critical components required for an effective anti-tumor response to cancer. These include modulation of the microvasculature via angiogenesis-targeted agents; induction of a potent immune response via activators on effector cells in the tumor microenvironment; and alleviation of immunosuppressive mechanisms used by tumors to evade immune surveillance. We plan to advance our product candidates through clinical development as both standalone therapies and in combination with our proprietary drug candidates as long as their continued development is supported by clinical and nonclinical data. References to Compass or the Company herein include Compass Therapeutics, Inc. and its wholly-owned subsidiaries. The Company was incorporated as Olivia Ventures, Inc. (“Olivia”) in the State of Delaware on March 20, 2018. Prior to the Company’s reverse merger with Compass Therapeutics LLC (the “Merger”), Olivia was a “shell company” (as defined in Rule 12b-2 of the Securities Exchange Act of 1934, as amended). The Company is subject to risks and uncertainties common to companies in the biotechnology and pharmaceutical industries. There can be no assurance that the Company’s research and development will be successfully completed, that adequate protection for the Company’s technology will be obtained, that any products developed will obtain necessary government regulatory approval or that any approved products will be commercially viable. The Company operates in an environment of rapid change in technology and substantial competition from pharmaceutical and biotechnology companies. In addition, the Company is dependent upon the services of its employees and consultants. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the financial statements) considered necessary to present fairly the Company’s financial position as of June 30, 2021 and its results of operations and changes in convertible preferred stock and stockholders’ equity (deficit) for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. Operating results for the six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The unaudited condensed consolidated financial statements include the accounts of Compass Therapeutics, Inc. and its subsidiaries, and have been prepared by the Company in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “Annual Report”). Going Concern These financial statements have been prepared on the basis that the Company is a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. The Company has not generated any revenues from operations since inception and does not expect to do so in the foreseeable future. We have funded our operations primarily with proceeds from the sale of our equity securities and borrowings from debt arrangements. Through June 30, 2021, we have received $132.0 million in gross proceeds from the sale of equity securities and $15.0 million in term loan borrowings under the Credit Facility. Following the completion of the Merger, we completed a private placement of our common stock of $60.5 million. As of June 30, 2021, we had cash and cash equivalents of $31.2 million. This cash balance is not sufficient to fund the Company’s current operating plan for at least the next twelve months following the filing of this Quarterly Report. These factors raise substantial doubt about the Company’s ability to continue as a going concern. Management is exploring opportunities to secure additional funding through equity or debt financings or through collaborations, licensing transactions or other sources. COVID-19 Update We have been carefully monitoring the COVID-19 pandemic and its potential impact on our business and have taken important steps to help ensure the safety of our employees and to reduce the spread of COVID-19 community-wide. We are ensuring that essential staffing levels at our operations remain in place, including maintaining key personnel in our laboratory facilities. We have implemented stringent safety measures designed to create a safe and clean environment for our employees as we continue to comply with applicable federal, state and local guidelines instituted in response to the COVID-19 pandemic. We have been able to continue to pursue patient dosing and monitoring of our Phase 1 clinical trial of CTX-471 without significant delays. However, over the last six months we have experienced increased delays in patient enrollment in several of our trial sites. In order to address the reduction in patient enrollment, we have recently added three new sites. In addition, there have been delays in sourcing of selected supplies required for the manufacturing of material to be used in our future clinical trials, and these delays may impact the timing of initiation of our future clinical trials We expect that COVID-19 may continue to directly or indirectly impact (i) our employees and business operations or personnel at third-party suppliers and other vendors in the U.S. and other countries; (ii) the availability, cost or supply of materials; and (iii) the timeline for our ongoing clinical trial and potential future trials. We are continuing to assess the potential impact of the COVID-19 pandemic on our current and future business and operations, including our expenses and clinical trials, as well as on our industry and the healthcare system.

Nature of Business and Basis of Presentation

6 Months Ended

Jun. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Business and Basis of Presentation

1. Nature of Business and Basis of Presentation

Compass Therapeutics, Inc. (“Compass” or the “Company”) is a clinical-stage, oncology-focused biopharmaceutical company developing proprietary antibody-based therapeutics to treat multiple human diseases. Our scientific focus is on the relationship between angiogenesis and the immune system. Our pipeline includes novel product candidates that leverage our understanding of the tumor microenvironment, including both angiogenesis-targeted agents and immune-oncology focused agents. These product candidates are designed to optimize critical components required for an effective anti-tumor response to cancer. These include modulation of the microvasculature via angiogenesis-targeted agents; induction of a potent immune response via activators on effector cells in the tumor microenvironment; and alleviation of immunosuppressive mechanisms used by tumors to evade immune surveillance. We plan to advance our product candidates through clinical development as both standalone therapies and in combination with our proprietary drug candidates as long as their continued development is supported by clinical and nonclinical data. References to Compass or the Company herein include Compass Therapeutics, Inc. and its wholly-owned subsidiaries. The Company was incorporated as Olivia Ventures, Inc. (“Olivia”) in the State of Delaware on March 20, 2018. Prior to the Company’s reverse merger with Compass Therapeutics LLC (the “Merger”), Olivia was a “shell company” (as defined in Rule 12b-2 of the Securities Exchange Act of 1934, as amended).

The Company is subject to risks and uncertainties common to companies in the biotechnology and pharmaceutical industries. There can be no assurance that the Company’s research and development will be successfully completed, that adequate protection for the Company’s technology will be obtained, that any products developed will obtain necessary government regulatory approval or that any approved products will be commercially viable. The Company operates in an environment of rapid change in technology and substantial competition from pharmaceutical and biotechnology companies. In addition, the Company is dependent upon the services of its employees and consultants.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all normal and recurring adjustments (which consist primarily of accruals, estimates and assumptions that impact the financial statements) considered necessary to present fairly the Company’s financial position as of June 30, 2021 and its results of operations and changes in convertible preferred stock and stockholders’ equity (deficit) for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. Operating results for the six months ended June 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

The unaudited condensed consolidated financial statements include the accounts of Compass Therapeutics, Inc. and its subsidiaries, and have been prepared by the Company in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 (the “Annual Report”).

Going Concern

These financial statements have been prepared on the basis that the Company is a going concern, which contemplates the realization of assets and satisfaction of liabilities in the normal course of business. The consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. The Company has not generated any revenues from operations since inception and does not expect to do so in the foreseeable future. We have funded our operations primarily with proceeds from the sale of our equity securities and borrowings from debt arrangements. Through June 30, 2021, we have received $132.0 million in gross proceeds from the sale of equity securities and $15.0 million in term loan borrowings under the Credit Facility. Following the completion of the Merger, we completed a private placement of our common stock of $60.5 million.

As of June 30, 2021, we had cash and cash equivalents of $31.2 million. This cash balance is not sufficient to fund the Company’s current operating plan for at least the next twelve months following the filing of this Quarterly Report. These factors raise substantial doubt about the Company’s ability to continue as a going concern. Management is exploring opportunities to secure additional funding through equity or debt financings or through collaborations, licensing transactions or other sources.

COVID-19 Update

We have been carefully monitoring the COVID-19 pandemic and its potential impact on our business and have taken important steps to help ensure the safety of our employees and to reduce the spread of COVID-19 community-wide. We are ensuring that essential staffing levels at our operations remain in place, including maintaining key personnel in our laboratory facilities. We have implemented stringent safety measures designed to create a safe and clean environment for our employees as we continue to comply with applicable federal, state and local guidelines instituted in response to the COVID-19 pandemic.

We have been able to continue to pursue patient dosing and monitoring of our Phase 1 clinical trial of CTX-471 without significant delays. However, over the last six months we have experienced increased delays in patient enrollment in several of our trial sites. In order to address the reduction in patient enrollment, we have recently added three new sites. In addition, there have been delays in sourcing of selected supplies required for the manufacturing of material to be used in our future clinical trials, and these delays may impact the timing of initiation of our future clinical trials We expect that COVID-19 may continue to directly or indirectly impact (i) our employees and business operations or personnel at third-party suppliers and other vendors in the U.S. and other countries; (ii) the availability, cost or supply of materials; and (iii) the timeline for our ongoing clinical trial and potential future trials. We are continuing to assess the potential impact of the COVID-19 pandemic on our current and future business and operations, including our expenses and clinical trials, as well as on our industry and the healthcare system.