v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 09, 2012
Entity Registrant Name INSMED INC  
Entity Central Index Key 0001104506  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Public Float   $ 98,460,533
Entity Common Stock, Shares Outstanding   24,863,771
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus FY  
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2011