Nature of Business	6 Months Ended
Nature of Business	Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Editas Medicine, Inc. (the “Company”) is a pioneering gene editing company dedicated to developing potentially transformative genomic medicines to treat a broad range of serious diseases. The Company was incorporated in the state of Delaware in September 2013. Its principal offices are in Cambridge, Massachusetts. Since its inception, the Company has devoted substantially all of its efforts to business planning, research and development, recruiting management and technical staff, and raising capital. The Company has primarily financed its operations through various equity financings, payments received under a research collaboration with Juno Therapeutics, Inc. (“Juno Therapeutics”), a wholly owned subsidiary of the Bristol-Myers Squibb Company (“BMS”), payments received under its former strategic alliance with Allergan Pharmaceuticals International Limited (together with its affiliates, “Allergan”), which was terminated in August 2020, payments received under the purchase and sale agreement with DRI Healthcare Acquisitions LP (“DRI”), and payments received in conjunction with the Company’s license agreement with Vertex Pharmaceuticals, Inc (“Vertex”, and such agreement, the “Vertex License Agreement”). The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, dependence on key personnel, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations and ability to transition from pilot-scale manufacturing to large-scale production of products. Liquidity As of June 30, 2025, the Company has raised an aggregate of $1.0 billion in net proceeds through the sale of shares of its common stock in public offerings and at-the-market offerings. The Company also has funded its business from payments received under its purchase and sale agreement with DRI, payments received under the Vertex License Agreement, its research collaboration with BMS through its wholly owned subsidiary Juno Therapeutics and its former strategic alliance with Allergan (which was terminated in August 2020). As of June 30, 2025, the Company had cash, cash equivalents and marketable securities of $178.5 million. In May 2021, the Company entered into a common stock sales agreement with TD Securities (USA) LLC (as successor to Cowen and Company, LLC) (“TD Cowen”), under which the Company from time to time can issue and sell shares of the Company’s common stock through TD Cowen in at-the-market offerings for aggregate gross sale proceeds of up to $300.0 million. The Company amended the common stock sales agreement with TD Cowen in February 2024 in connection with filing a new registration statement. In March 2025, the Company further amended its common stock sales agreement with TD Cowen in connection with amending its existing shelf registration statement following the loss of the Company’s status as a “well-known seasoned issuer” (as defined under Rule 405 of the Securities Act of 1933, as amended), reducing the amount of shares of common stock the Company may issue and sell through TD Cowen to aggregate gross sale proceeds of up to $150.0 million (the “ATM Facility”). As of June 30, 2025, the Company has sold 4,126,072 shares of common stock under the ATM Facility for gross proceeds of $8.6 million and has $141.4 million available under the ATM Facility. The Company has incurred annual net operating losses in every year since its inception. As of August 12, 2025, the issuance date of the consolidated financial statements, the Company expects that its existing cash, cash equivalents and marketable securities will be sufficient to fund its operating expenses and capital expenditure requirements for at least twelve months from the issuance date of the consolidated financial statements. The Company had an accumulated deficit of $1.6 billion at June 30, 2025, and will require substantial additional capital to fund its operations. The Company has never generated any product revenue. There can be no assurance that the Company will be able to obtain additional debt or equity financing or generate product revenue or revenues from collaborative partners, on terms acceptable to the Company, on a timely basis or at all. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s business, results of operations, and financial condition.