BUSINESS AND BASIS OF PRESENTATION	9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]
BUSINESS AND BASIS OF PRESENTATION	1. BUSINESS AND BASIS OF PRESENTATION *Business* Sarepta Therapeutics, Inc. and its wholly-owned subsidiaries (“Sarepta” or the “Company”) is a biopharmaceutical company focused on the discovery and development of unique RNA-based therapeutics for the treatment of rare and infectious diseases. Applying its proprietary platform technologies, the Company is able to target a broad range of diseases and disorders through distinct RNA-based mechanisms of action. The Company is focused on advancing the development of its Duchenne muscular dystrophy (“DMD”) drug candidates, including its lead product candidate, eteplirsen, for which the Company is in process of conducting or starting several studies. These include an ongoing open label extension study following completion of its initial Phase IIb clinical trials, several clinical trials in Exon 51 amenable genotypes, including a confirmatory study in ambulatory patients, studies on participants with early stage and advanced stage DMD and a placebo-controlled confirmatory study with one or more of the Company’s follow-on DMD exon-skipping drug candidates. Additionally, the Company is working on a Phase I/IIa clinical trial for an Exon 53 skipping product candidate in the European Union (“E.U.”) and has an open investigational new drug (“IND”) application for its Exon 45 skipping product candidate for which it plans to begin a clinical trial early next year. The Company is also developing therapeutics for the treatment of infectious diseases. The Company was developing product candidates for Ebola and Marburg under a now expired Department of Defense (“DoD”) contract and further development of these product candidates would be conditioned, in part, on obtaining additional funding, collaborations or emergency use. The Company has not generated any revenue from product sales to date and there can be no assurance that revenue from product sales will be achieved. Even if the Company does achieve revenue from product sales, it is likely to continue to incur operating losses in the near term. As of September 30, 2014, the Company had approximately $240.7 million of cash, cash equivalents and investments, consisting of $52.3 million of cash and cash equivalents, $183.7 million of short-term investments and $4.6 million of restricted investments. The Company believes that its balance of cash, cash equivalents and investments is sufficient to fund its current operational plan for the next twelve months. The Company may pursue additional cash resources through public or private financings, seek additional government contracts and establish collaborations with or license its technology to other companies. *Basis of Presentation* The accompanying unaudited condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”), reflect the accounts of Sarepta Therapeutics, Inc. and its wholly-owned subsidiaries. All intercompany transactions between and among its consolidated subsidiaries have been eliminated. Management has determined that the Company operates in one segment: the development of pharmaceutical products on its own behalf or in collaboration with others. The information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and the accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013. *Estimates and Uncertainties* The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, equity, revenue, expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include the valuation of stock-based awards and liability classified warrants, research and development expenses and revenue recognition. *Reclassification* The Company has revised the presentation as well as the caption of certain current liabilities within the unaudited condensed consolidated balance sheets to conform to the current period presentation. “Accrued liabilities” of $9.6 million as of December 31, 2013 is reclassified from “accounts payable” to “accrued liabilities”. “Accrued employee compensation” of $5.0 million as of December 31, 2013 is also included within “accrued liabilities”. The reclassification had no impact on total current liabilities or total liabilities. Additionally, the Company has revised the presentation as well as the caption of certain cash flows from operating activities within the unaudited condensed consolidated statements of cash flows to conform to the current period presentation. “Net decrease in other assets” is broken out from “Net increase in accounts receivable and other assets” and presented gross on the unaudited condensed consolidated statements of cash flows. This revision had no impact on net cash used in operating activities or change in cash and cash equivalents.

1. BUSINESS AND BASIS OF PRESENTATION

Business

Sarepta Therapeutics, Inc. and its wholly-owned subsidiaries (“Sarepta” or the “Company”) is a biopharmaceutical company focused on the discovery and development of unique RNA-based therapeutics for the treatment of rare and infectious diseases. Applying its proprietary platform technologies, the Company is able to target a broad range of diseases and disorders through distinct RNA-based mechanisms of action. The Company is focused on advancing the development of its Duchenne muscular dystrophy (“DMD”) drug candidates, including its lead product candidate, eteplirsen, for which the Company is in process of conducting or starting several studies. These include an ongoing open label extension study following completion of its initial Phase IIb clinical trials, several clinical trials in Exon 51 amenable genotypes, including a confirmatory study in ambulatory patients, studies on participants with early stage and advanced stage DMD and a placebo-controlled confirmatory study with one or more of the Company’s follow-on DMD exon-skipping drug candidates. Additionally, the Company is working on a Phase I/IIa clinical trial for an Exon 53 skipping product candidate in the European Union (“E.U.”) and has an open investigational new drug (“IND”) application for its Exon 45 skipping product candidate for which it plans to begin a clinical trial early next year. The Company is also developing therapeutics for the treatment of infectious diseases. The Company was developing product candidates for Ebola and Marburg under a now expired Department of Defense (“DoD”) contract and further development of these product candidates would be conditioned, in part, on obtaining additional funding, collaborations or emergency use.

The Company has not generated any revenue from product sales to date and there can be no assurance that revenue from product sales will be achieved. Even if the Company does achieve revenue from product sales, it is likely to continue to incur operating losses in the near term.

As of September 30, 2014, the Company had approximately $240.7 million of cash, cash equivalents and investments, consisting of $52.3 million of cash and cash equivalents, $183.7 million of short-term investments and $4.6 million of restricted investments. The Company believes that its balance of cash, cash equivalents and investments is sufficient to fund its current operational plan for the next twelve months. The Company may pursue additional cash resources through public or private financings, seek additional government contracts and establish collaborations with or license its technology to other companies.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”), reflect the accounts of Sarepta Therapeutics, Inc. and its wholly-owned subsidiaries. All intercompany transactions between and among its consolidated subsidiaries have been eliminated. Management has determined that the Company operates in one segment: the development of pharmaceutical products on its own behalf or in collaboration with others. The information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and the accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

Estimates and Uncertainties

The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, equity, revenue, expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Significant items subject to such estimates and assumptions include the valuation of stock-based awards and liability classified warrants, research and development expenses and revenue recognition.

Reclassification

The Company has revised the presentation as well as the caption of certain current liabilities within the unaudited condensed consolidated balance sheets to conform to the current period presentation. “Accrued liabilities” of $9.6 million as of December 31, 2013 is reclassified from “accounts payable” to “accrued liabilities”. “Accrued employee compensation” of $5.0 million as of December 31, 2013 is also included within “accrued liabilities”. The reclassification had no impact on total current liabilities or total liabilities.

Additionally, the Company has revised the presentation as well as the caption of certain cash flows from operating activities within the unaudited condensed consolidated statements of cash flows to conform to the current period presentation. “Net decrease in other assets” is broken out from “Net increase in accounts receivable and other assets” and presented gross on the unaudited condensed consolidated statements of cash flows. This revision had no impact on net cash used in operating activities or change in cash and cash equivalents.