Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 14, 2017
Jul. 01, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name IROBOT CORP    
Entity Central Index Key 0001159167    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Amendment Flag false    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 918,300,000
Entity Common Stock, Shares Outstanding   27,246,211