DESCRIPTION OF BUSINESS	9 Months Ended
DESCRIPTION OF BUSINESS	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	DESCRIPTION OF BUSINESS Viridian Therapeutics, Inc., a Delaware corporation (the “Company” or “Viridian”), is a biopharmaceutical company focused on engineering and developing potential best-in-class medicines for patients with serious and rare diseases. The Company’s expertise in antibody discovery and engineering enables it to develop differentiated therapeutic candidates for previously validated drug targets in commercially established disease areas. The Company’s most advanced program, VRDN-001, is a differentiated monoclonal antibody targeting insulin-like growth factor-1 receptor (“IGF-1R”), a clinically and commercially validated target for the treatment of thyroid eye disease (“TED”). In addition to its intravenously-administered VRDN-001 program, the Company is advancing three candidates for its subcutaneous (“SC”) strategy (VRDN-001 SC, VRDN-002 and VRDN-003). TED is a debilitating autoimmune disease that causes inflammation and fibrosis within the orbit of the eye which can cause proptosis, double vision, pain, and potential blindness. Patients with severe disease often require multiple remedial surgeries to the orbit, eye muscles and eyelids. In addition to developing therapies for TED, the Company is developing a portfolio of neonatal Fc receptor (“FcRn”) inhibitors, VRDN-006 and VRDN-008. FcRn inhibition has the potential to treat a broad array of autoimmune diseases, representing a significant commercial opportunity. VRDN-006 is a highly selective Fc fragment. VRDN-008 is a novel, first-in-class FcRn inhibitor that aims to pair immunoglobulin G (IgG) suppression with extended half-life technology. Liquidity The accompanying condensed consolidated financial statements have been prepared on a basis that assumes the Company is a going concern and do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from any uncertainty related to its ability to continue as a going concern. The Company has funded its operations to date principally through proceeds received from the sale of the Company’s common stock, its Series A Preferred Stock, Series B Preferred Stock, and other equity securities, debt financings, license fees, and reimbursements received under collaboration agreements. Since its inception and through September 30, 2023, the Company has generated an accumulated deficit of $659.0 million. The Company expects to continue to generate operating losses for the foreseeable future. The Company has no products approved for commercial sale, has not generated any revenue from product sales, and cannot guarantee when or if it will generate any revenue from product sales. Substantially all of the Company’s operating losses resulted from expenses incurred in connection with its research and development programs and from general and administrative costs associated with its operations. The Company expects to incur significant expenses and operating losses for at least the next several years as it continues the development of, and seeks regulatory approval for, its product candidates. It is expected that operating losses will fluctuate significantly from quarter to quarter and year to year due to timing of development programs and efforts to achieve regulatory approval. As of September 30, 2023, the Company had approximately $313.0 million in cash, cash equivalents, and short-term investments. As of the issuance date of these condensed consolidated financial statements, the Company expects that its current resources will be sufficient to fund its operations for at least the next twelve months from the issuance of these financial statements. The Company will continue to require additional capital in order to continue to finance its operations. The amount and timing of future funding requirements will depend on many factors, including the pace and results of the Company’s clinical development efforts, equity financings, entering into license and collaboration agreements, and issuing debt or other financing vehicles. The Company’s ability to secure additional capital is dependent upon a number of factors, some of which are outside of the Company’s control, including success in developing its drug product candidates and technology, operational performance, and market conditions, including those resulting from the current inflationary and broader macroeconomic environment. Failure to raise capital as and when needed, on favorable terms or at all, would have a negative impact on the Company’s financial condition and its ability to develop its product candidates. Changing circumstances may cause the Company to consume capital significantly faster or slower than currently anticipated. If the Company is unable to raise additional capital or resources, it will be required to modify its operational plans. The estimates included herein are based on assumptions that may prove to be wrong, and the Company could exhaust its available financial resources sooner than currently anticipated.