XML 17 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 19, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-30739    
Entity Registrant Name INSMED INC    
Entity Incorporation, State or Country Code VA    
Entity Tax Identification Number 54-1972729    
Entity Address, Address Line One 700 US Highway 202/206    
Entity Address, City or Town Bridgewater    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08807    
City Area Code 908    
Local Phone Number 977-9900    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol INSM    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 3.0
Entity Common Stock, Shares Outstanding   148,491,583  
Documents Incorporated by Reference Portions of the registrant's definitive Proxy Statement for its 2024 Annual Meeting of Shareholders to be filed with the Securities and Exchange Commission no later than April 29, 2024 and to be delivered to shareholders in connection with the 2024 Annual Meeting of Shareholders, are herein incorporated by reference in Part III of this Annual Report on Form 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001104506