Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 02, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol SRPT  
Entity Registrant Name Sarepta Therapeutics, Inc.  
Entity Central Index Key 0000873303  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   74,340,417
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-14895  
Entity Tax Identification Number 930797222  
Entity Address, Address Line One 215 First Street  
Entity Address, Address Line Two Suite 415  
Entity Address, State or Province MA  
Entity Address, City or Town Cambridge  
Entity Address, Postal Zip Code 02142  
City Area Code 617  
Local Phone Number 274-4000